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//opt/alt/python27/lib/python2.7/site-packages/paste/util/doctest24.py
# Module doctest. # Released to the public domain 16-Jan-2001, by Tim Peters (tim@python.org). # Major enhancements and refactoring by: # Jim Fulton # Edward Loper # Provided as-is; use at your own risk; no warranty; no promises; enjoy! r"""Module doctest -- a framework for running examples in docstrings. In simplest use, end each module M to be tested with: def _test(): import doctest doctest.testmod() if __name__ == "__main__": _test() Then running the module as a script will cause the examples in the docstrings to get executed and verified: python M.py This won't display anything unless an example fails, in which case the failing example(s) and the cause(s) of the failure(s) are printed to stdout (why not stderr? because stderr is a lame hack <0.2 wink>), and the final line of output is "Test failed.". Run it with the -v switch instead: python M.py -v and a detailed report of all examples tried is printed to stdout, along with assorted summaries at the end. You can force verbose mode by passing "verbose=True" to testmod, or prohibit it by passing "verbose=False". In either of those cases, sys.argv is not examined by testmod. There are a variety of other ways to run doctests, including integration with the unittest framework, and support for running non-Python text files containing doctests. There are also many ways to override parts of doctest's default behaviors. See the Library Reference Manual for details. """ __docformat__ = 'reStructuredText en' __all__ = [ # 0, Option Flags 'register_optionflag', 'DONT_ACCEPT_TRUE_FOR_1', 'DONT_ACCEPT_BLANKLINE', 'NORMALIZE_WHITESPACE', 'ELLIPSIS', 'IGNORE_EXCEPTION_DETAIL', 'COMPARISON_FLAGS', 'REPORT_UDIFF', 'REPORT_CDIFF', 'REPORT_NDIFF', 'REPORT_ONLY_FIRST_FAILURE', 'REPORTING_FLAGS', # 1. Utility Functions 'is_private', # 2. Example & DocTest 'Example', 'DocTest', # 3. Doctest Parser 'DocTestParser', # 4. Doctest Finder 'DocTestFinder', # 5. Doctest Runner 'DocTestRunner', 'OutputChecker', 'DocTestFailure', 'UnexpectedException', 'DebugRunner', # 6. Test Functions 'testmod', 'testfile', 'run_docstring_examples', # 7. Tester 'Tester', # 8. Unittest Support 'DocTestSuite', 'DocFileSuite', 'set_unittest_reportflags', # 9. Debugging Support 'script_from_examples', 'testsource', 'debug_src', 'debug', ] import __future__ import sys, traceback, inspect, linecache, os, re, types import unittest, difflib, pdb, tempfile import warnings from StringIO import StringIO # Don't whine about the deprecated is_private function in this # module's tests. warnings.filterwarnings("ignore", "is_private", DeprecationWarning, __name__, 0) # There are 4 basic classes: # - Example: a <source, want> pair, plus an intra-docstring line number. # - DocTest: a collection of examples, parsed from a docstring, plus # info about where the docstring came from (name, filename, lineno). # - DocTestFinder: extracts DocTests from a given object's docstring and # its contained objects' docstrings. # - DocTestRunner: runs DocTest cases, and accumulates statistics. # # So the basic picture is: # # list of: # +------+ +---------+ +-------+ # |object| --DocTestFinder-> | DocTest | --DocTestRunner-> |results| # +------+ +---------+ +-------+ # | Example | # | ... | # | Example | # +---------+ # Option constants. OPTIONFLAGS_BY_NAME = {} def register_optionflag(name): flag = 1 << len(OPTIONFLAGS_BY_NAME) OPTIONFLAGS_BY_NAME[name] = flag return flag DONT_ACCEPT_TRUE_FOR_1 = register_optionflag('DONT_ACCEPT_TRUE_FOR_1') DONT_ACCEPT_BLANKLINE = register_optionflag('DONT_ACCEPT_BLANKLINE') NORMALIZE_WHITESPACE = register_optionflag('NORMALIZE_WHITESPACE') ELLIPSIS = register_optionflag('ELLIPSIS') IGNORE_EXCEPTION_DETAIL = register_optionflag('IGNORE_EXCEPTION_DETAIL') COMPARISON_FLAGS = (DONT_ACCEPT_TRUE_FOR_1 | DONT_ACCEPT_BLANKLINE | NORMALIZE_WHITESPACE | ELLIPSIS | IGNORE_EXCEPTION_DETAIL) REPORT_UDIFF = register_optionflag('REPORT_UDIFF') REPORT_CDIFF = register_optionflag('REPORT_CDIFF') REPORT_NDIFF = register_optionflag('REPORT_NDIFF') REPORT_ONLY_FIRST_FAILURE = register_optionflag('REPORT_ONLY_FIRST_FAILURE') REPORTING_FLAGS = (REPORT_UDIFF | REPORT_CDIFF | REPORT_NDIFF | REPORT_ONLY_FIRST_FAILURE) # Special string markers for use in `want` strings: BLANKLINE_MARKER = '<BLANKLINE>' ELLIPSIS_MARKER = '...' ###################################################################### ## Table of Contents ###################################################################### # 1. Utility Functions # 2. Example & DocTest -- store test cases # 3. DocTest Parser -- extracts examples from strings # 4. DocTest Finder -- extracts test cases from objects # 5. DocTest Runner -- runs test cases # 6. Test Functions -- convenient wrappers for testing # 7. Tester Class -- for backwards compatibility # 8. Unittest Support # 9. Debugging Support # 10. Example Usage ###################################################################### ## 1. Utility Functions ###################################################################### def is_private(prefix, base): """prefix, base -> true iff name prefix + "." + base is "private". Prefix may be an empty string, and base does not contain a period. Prefix is ignored (although functions you write conforming to this protocol may make use of it). Return true iff base begins with an (at least one) underscore, but does not both begin and end with (at least) two underscores. >>> is_private("a.b", "my_func") False >>> is_private("____", "_my_func") True >>> is_private("someclass", "__init__") False >>> is_private("sometypo", "__init_") True >>> is_private("x.y.z", "_") True >>> is_private("_x.y.z", "__") False >>> is_private("", "") # senseless but consistent False """ warnings.warn("is_private is deprecated; it wasn't useful; " "examine DocTestFinder.find() lists instead", DeprecationWarning, stacklevel=2) return base[:1] == "_" and not base[:2] == "__" == base[-2:] def _extract_future_flags(globs): """ Return the compiler-flags associated with the future features that have been imported into the given namespace (globs). """ flags = 0 for fname in __future__.all_feature_names: feature = globs.get(fname, None) if feature is getattr(__future__, fname): flags |= feature.compiler_flag return flags def _normalize_module(module, depth=2): """ Return the module specified by `module`. In particular: - If `module` is a module, then return module. - If `module` is a string, then import and return the module with that name. - If `module` is None, then return the calling module. The calling module is assumed to be the module of the stack frame at the given depth in the call stack. """ if inspect.ismodule(module): return module elif isinstance(module, (str, unicode)): return __import__(module, globals(), locals(), ["*"]) elif module is None: return sys.modules[sys._getframe(depth).f_globals['__name__']] else: raise TypeError("Expected a module, string, or None") def _indent(s, indent=4): """ Add the given number of space characters to the beginning every non-blank line in `s`, and return the result. """ # This regexp matches the start of non-blank lines: return re.sub('(?m)^(?!$)', indent*' ', s) def _exception_traceback(exc_info): """ Return a string containing a traceback message for the given exc_info tuple (as returned by sys.exc_info()). """ # Get a traceback message. excout = StringIO() exc_type, exc_val, exc_tb = exc_info traceback.print_exception(exc_type, exc_val, exc_tb, file=excout) return excout.getvalue() # Override some StringIO methods. class _SpoofOut(StringIO): def getvalue(self): result = StringIO.getvalue(self) # If anything at all was written, make sure there's a trailing # newline. There's no way for the expected output to indicate # that a trailing newline is missing. if result and not result.endswith("\n"): result += "\n" # Prevent softspace from screwing up the next test case, in # case they used print with a trailing comma in an example. if hasattr(self, "softspace"): del self.softspace return result def truncate(self, size=None): StringIO.truncate(self, size) if hasattr(self, "softspace"): del self.softspace # Worst-case linear-time ellipsis matching. def _ellipsis_match(want, got): """ Essentially the only subtle case: >>> _ellipsis_match('aa...aa', 'aaa') False """ if ELLIPSIS_MARKER not in want: return want == got # Find "the real" strings. ws = want.split(ELLIPSIS_MARKER) assert len(ws) >= 2 # Deal with exact matches possibly needed at one or both ends. startpos, endpos = 0, len(got) w = ws[0] if w: # starts with exact match if got.startswith(w): startpos = len(w) del ws[0] else: return False w = ws[-1] if w: # ends with exact match if got.endswith(w): endpos -= len(w) del ws[-1] else: return False if startpos > endpos: # Exact end matches required more characters than we have, as in # _ellipsis_match('aa...aa', 'aaa') return False # For the rest, we only need to find the leftmost non-overlapping # match for each piece. If there's no overall match that way alone, # there's no overall match period. for w in ws: # w may be '' at times, if there are consecutive ellipses, or # due to an ellipsis at the start or end of `want`. That's OK. # Search for an empty string succeeds, and doesn't change startpos. startpos = got.find(w, startpos, endpos) if startpos < 0: return False startpos += len(w) return True def _comment_line(line): "Return a commented form of the given line" line = line.rstrip() if line: return '# '+line else: return '#' class _OutputRedirectingPdb(pdb.Pdb): """ A specialized version of the python debugger that redirects stdout to a given stream when interacting with the user. Stdout is *not* redirected when traced code is executed. """ def __init__(self, out): self.__out = out pdb.Pdb.__init__(self) def trace_dispatch(self, *args): # Redirect stdout to the given stream. save_stdout = sys.stdout sys.stdout = self.__out # Call Pdb's trace dispatch method. try: return pdb.Pdb.trace_dispatch(self, *args) finally: sys.stdout = save_stdout # [XX] Normalize with respect to os.path.pardir? def _module_relative_path(module, path): if not inspect.ismodule(module): raise TypeError, 'Expected a module: %r' % module if path.startswith('/'): raise ValueError, 'Module-relative files may not have absolute paths' # Find the base directory for the path. if hasattr(module, '__file__'): # A normal module/package basedir = os.path.split(module.__file__)[0] elif module.__name__ == '__main__': # An interactive session. if len(sys.argv)>0 and sys.argv[0] != '': basedir = os.path.split(sys.argv[0])[0] else: basedir = os.curdir else: # A module w/o __file__ (this includes builtins) raise ValueError("Can't resolve paths relative to the module " + module + " (it has no __file__)") # Combine the base directory and the path. return os.path.join(basedir, *(path.split('/'))) ###################################################################### ## 2. Example & DocTest ###################################################################### ## - An "example" is a <source, want> pair, where "source" is a ## fragment of source code, and "want" is the expected output for ## "source." The Example class also includes information about ## where the example was extracted from. ## ## - A "doctest" is a collection of examples, typically extracted from ## a string (such as an object's docstring). The DocTest class also ## includes information about where the string was extracted from. class Example: """ A single doctest example, consisting of source code and expected output. `Example` defines the following attributes: - source: A single Python statement, always ending with a newline. The constructor adds a newline if needed. - want: The expected output from running the source code (either from stdout, or a traceback in case of exception). `want` ends with a newline unless it's empty, in which case it's an empty string. The constructor adds a newline if needed. - exc_msg: The exception message generated by the example, if the example is expected to generate an exception; or `None` if it is not expected to generate an exception. This exception message is compared against the return value of `traceback.format_exception_only()`. `exc_msg` ends with a newline unless it's `None`. The constructor adds a newline if needed. - lineno: The line number within the DocTest string containing this Example where the Example begins. This line number is zero-based, with respect to the beginning of the DocTest. - indent: The example's indentation in the DocTest string. I.e., the number of space characters that preceed the example's first prompt. - options: A dictionary mapping from option flags to True or False, which is used to override default options for this example. Any option flags not contained in this dictionary are left at their default value (as specified by the DocTestRunner's optionflags). By default, no options are set. """ def __init__(self, source, want, exc_msg=None, lineno=0, indent=0, options=None): # Normalize inputs. if not source.endswith('\n'): source += '\n' if want and not want.endswith('\n'): want += '\n' if exc_msg is not None and not exc_msg.endswith('\n'): exc_msg += '\n' # Store properties. self.source = source self.want = want self.lineno = lineno self.indent = indent if options is None: options = {} self.options = options self.exc_msg = exc_msg class DocTest: """ A collection of doctest examples that should be run in a single namespace. Each `DocTest` defines the following attributes: - examples: the list of examples. - globs: The namespace (aka globals) that the examples should be run in. - name: A name identifying the DocTest (typically, the name of the object whose docstring this DocTest was extracted from). - filename: The name of the file that this DocTest was extracted from, or `None` if the filename is unknown. - lineno: The line number within filename where this DocTest begins, or `None` if the line number is unavailable. This line number is zero-based, with respect to the beginning of the file. - docstring: The string that the examples were extracted from, or `None` if the string is unavailable. """ def __init__(self, examples, globs, name, filename, lineno, docstring): """ Create a new DocTest containing the given examples. The DocTest's globals are initialized with a copy of `globs`. """ assert not isinstance(examples, basestring), \ "DocTest no longer accepts str; use DocTestParser instead" self.examples = examples self.docstring = docstring self.globs = globs.copy() self.name = name self.filename = filename self.lineno = lineno def __repr__(self): if len(self.examples) == 0: examples = 'no examples' elif len(self.examples) == 1: examples = '1 example' else: examples = '%d examples' % len(self.examples) return ('<DocTest %s from %s:%s (%s)>' % (self.name, self.filename, self.lineno, examples)) # This lets us sort tests by name: def __cmp__(self, other): if not isinstance(other, DocTest): return -1 return cmp((self.name, self.filename, self.lineno, id(self)), (other.name, other.filename, other.lineno, id(other))) ###################################################################### ## 3. DocTestParser ###################################################################### class DocTestParser: """ A class used to parse strings containing doctest examples. """ # This regular expression is used to find doctest examples in a # string. It defines three groups: `source` is the source code # (including leading indentation and prompts); `indent` is the # indentation of the first (PS1) line of the source code; and # `want` is the expected output (including leading indentation). _EXAMPLE_RE = re.compile(r''' # Source consists of a PS1 line followed by zero or more PS2 lines. (?P<source> (?:^(?P<indent> [ ]*) >>> .*) # PS1 line (?:\n [ ]* \.\.\. .*)*) # PS2 lines \n? # Want consists of any non-blank lines that do not start with PS1. (?P<want> (?:(?![ ]*$) # Not a blank line (?![ ]*>>>) # Not a line starting with PS1 .*$\n? # But any other line )*) ''', re.MULTILINE | re.VERBOSE) # A regular expression for handling `want` strings that contain # expected exceptions. It divides `want` into three pieces: # - the traceback header line (`hdr`) # - the traceback stack (`stack`) # - the exception message (`msg`), as generated by # traceback.format_exception_only() # `msg` may have multiple lines. We assume/require that the # exception message is the first non-indented line starting with a word # character following the traceback header line. _EXCEPTION_RE = re.compile(r""" # Grab the traceback header. Different versions of Python have # said different things on the first traceback line. ^(?P<hdr> Traceback\ \( (?: most\ recent\ call\ last | innermost\ last ) \) : ) \s* $ # toss trailing whitespace on the header. (?P<stack> .*?) # don't blink: absorb stuff until... ^ (?P<msg> \w+ .*) # a line *starts* with alphanum. """, re.VERBOSE | re.MULTILINE | re.DOTALL) # A callable returning a true value iff its argument is a blank line # or contains a single comment. _IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match def parse(self, string, name='<string>'): """ Divide the given string into examples and intervening text, and return them as a list of alternating Examples and strings. Line numbers for the Examples are 0-based. The optional argument `name` is a name identifying this string, and is only used for error messages. """ string = string.expandtabs() # If all lines begin with the same indentation, then strip it. min_indent = self._min_indent(string) if min_indent > 0: string = '\n'.join([l[min_indent:] for l in string.split('\n')]) output = [] charno, lineno = 0, 0 # Find all doctest examples in the string: for m in self._EXAMPLE_RE.finditer(string): # Add the pre-example text to `output`. output.append(string[charno:m.start()]) # Update lineno (lines before this example) lineno += string.count('\n', charno, m.start()) # Extract info from the regexp match. (source, options, want, exc_msg) = \ self._parse_example(m, name, lineno) # Create an Example, and add it to the list. if not self._IS_BLANK_OR_COMMENT(source): output.append( Example(source, want, exc_msg, lineno=lineno, indent=min_indent+len(m.group('indent')), options=options) ) # Update lineno (lines inside this example) lineno += string.count('\n', m.start(), m.end()) # Update charno. charno = m.end() # Add any remaining post-example text to `output`. output.append(string[charno:]) return output def get_doctest(self, string, globs, name, filename, lineno): """ Extract all doctest examples from the given string, and collect them into a `DocTest` object. `globs`, `name`, `filename`, and `lineno` are attributes for the new `DocTest` object. See the documentation for `DocTest` for more information. """ return DocTest(self.get_examples(string, name), globs, name, filename, lineno, string) def get_examples(self, string, name='<string>'): """ Extract all doctest examples from the given string, and return them as a list of `Example` objects. Line numbers are 0-based, because it's most common in doctests that nothing interesting appears on the same line as opening triple-quote, and so the first interesting line is called \"line 1\" then. The optional argument `name` is a name identifying this string, and is only used for error messages. """ return [x for x in self.parse(string, name) if isinstance(x, Example)] def _parse_example(self, m, name, lineno): """ Given a regular expression match from `_EXAMPLE_RE` (`m`), return a pair `(source, want)`, where `source` is the matched example's source code (with prompts and indentation stripped); and `want` is the example's expected output (with indentation stripped). `name` is the string's name, and `lineno` is the line number where the example starts; both are used for error messages. """ # Get the example's indentation level. indent = len(m.group('indent')) # Divide source into lines; check that they're properly # indented; and then strip their indentation & prompts. source_lines = m.group('source').split('\n') self._check_prompt_blank(source_lines, indent, name, lineno) self._check_prefix(source_lines[1:], ' '*indent + '.', name, lineno) source = '\n'.join([sl[indent+4:] for sl in source_lines]) # Divide want into lines; check that it's properly indented; and # then strip the indentation. Spaces before the last newline should # be preserved, so plain rstrip() isn't good enough. want = m.group('want') want_lines = want.split('\n') if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]): del want_lines[-1] # forget final newline & spaces after it self._check_prefix(want_lines, ' '*indent, name, lineno + len(source_lines)) want = '\n'.join([wl[indent:] for wl in want_lines]) # If `want` contains a traceback message, then extract it. m = self._EXCEPTION_RE.match(want) if m: exc_msg = m.group('msg') else: exc_msg = None # Extract options from the source. options = self._find_options(source, name, lineno) return source, options, want, exc_msg # This regular expression looks for option directives in the # source code of an example. Option directives are comments # starting with "doctest:". Warning: this may give false # positives for string-literals that contain the string # "#doctest:". Eliminating these false positives would require # actually parsing the string; but we limit them by ignoring any # line containing "#doctest:" that is *followed* by a quote mark. _OPTION_DIRECTIVE_RE = re.compile(r'#\s*doctest:\s*([^\n\'"]*)$', re.MULTILINE) def _find_options(self, source, name, lineno): """ Return a dictionary containing option overrides extracted from option directives in the given source string. `name` is the string's name, and `lineno` is the line number where the example starts; both are used for error messages. """ options = {} # (note: with the current regexp, this will match at most once:) for m in self._OPTION_DIRECTIVE_RE.finditer(source): option_strings = m.group(1).replace(',', ' ').split() for option in option_strings: if (option[0] not in '+-' or option[1:] not in OPTIONFLAGS_BY_NAME): raise ValueError('line %r of the doctest for %s ' 'has an invalid option: %r' % (lineno+1, name, option)) flag = OPTIONFLAGS_BY_NAME[option[1:]] options[flag] = (option[0] == '+') if options and self._IS_BLANK_OR_COMMENT(source): raise ValueError('line %r of the doctest for %s has an option ' 'directive on a line with no example: %r' % (lineno, name, source)) return options # This regular expression finds the indentation of every non-blank # line in a string. _INDENT_RE = re.compile('^([ ]*)(?=\S)', re.MULTILINE) def _min_indent(self, s): "Return the minimum indentation of any non-blank line in `s`" indents = [len(indent) for indent in self._INDENT_RE.findall(s)] if len(indents) > 0: return min(indents) else: return 0 def _check_prompt_blank(self, lines, indent, name, lineno): """ Given the lines of a source string (including prompts and leading indentation), check to make sure that every prompt is followed by a space character. If any line is not followed by a space character, then raise ValueError. """ for i, line in enumerate(lines): if len(line) >= indent+4 and line[indent+3] != ' ': raise ValueError('line %r of the docstring for %s ' 'lacks blank after %s: %r' % (lineno+i+1, name, line[indent:indent+3], line)) def _check_prefix(self, lines, prefix, name, lineno): """ Check that every line in the given list starts with the given prefix; if any line does not, then raise a ValueError. """ for i, line in enumerate(lines): if line and not line.startswith(prefix): raise ValueError('line %r of the docstring for %s has ' 'inconsistent leading whitespace: %r' % (lineno+i+1, name, line)) ###################################################################### ## 4. DocTest Finder ###################################################################### class DocTestFinder: """ A class used to extract the DocTests that are relevant to a given object, from its docstring and the docstrings of its contained objects. Doctests can currently be extracted from the following object types: modules, functions, classes, methods, staticmethods, classmethods, and properties. """ def __init__(self, verbose=False, parser=DocTestParser(), recurse=True, _namefilter=None, exclude_empty=True): """ Create a new doctest finder. The optional argument `parser` specifies a class or function that should be used to create new DocTest objects (or objects that implement the same interface as DocTest). The signature for this factory function should match the signature of the DocTest constructor. If the optional argument `recurse` is false, then `find` will only examine the given object, and not any contained objects. If the optional argument `exclude_empty` is false, then `find` will include tests for objects with empty docstrings. """ self._parser = parser self._verbose = verbose self._recurse = recurse self._exclude_empty = exclude_empty # _namefilter is undocumented, and exists only for temporary backward- # compatibility support of testmod's deprecated isprivate mess. self._namefilter = _namefilter def find(self, obj, name=None, module=None, globs=None, extraglobs=None): """ Return a list of the DocTests that are defined by the given object's docstring, or by any of its contained objects' docstrings. The optional parameter `module` is the module that contains the given object. If the module is not specified or is None, then the test finder will attempt to automatically determine the correct module. The object's module is used: - As a default namespace, if `globs` is not specified. - To prevent the DocTestFinder from extracting DocTests from objects that are imported from other modules. - To find the name of the file containing the object. - To help find the line number of the object within its file. Contained objects whose module does not match `module` are ignored. If `module` is False, no attempt to find the module will be made. This is obscure, of use mostly in tests: if `module` is False, or is None but cannot be found automatically, then all objects are considered to belong to the (non-existent) module, so all contained objects will (recursively) be searched for doctests. The globals for each DocTest is formed by combining `globs` and `extraglobs` (bindings in `extraglobs` override bindings in `globs`). A new copy of the globals dictionary is created for each DocTest. If `globs` is not specified, then it defaults to the module's `__dict__`, if specified, or {} otherwise. If `extraglobs` is not specified, then it defaults to {}. """ # If name was not specified, then extract it from the object. if name is None: name = getattr(obj, '__name__', None) if name is None: raise ValueError("DocTestFinder.find: name must be given " "when obj.__name__ doesn't exist: %r" % (type(obj),)) # Find the module that contains the given object (if obj is # a module, then module=obj.). Note: this may fail, in which # case module will be None. if module is False: module = None elif module is None: module = inspect.getmodule(obj) # Read the module's source code. This is used by # DocTestFinder._find_lineno to find the line number for a # given object's docstring. try: file = inspect.getsourcefile(obj) or inspect.getfile(obj) source_lines = linecache.getlines(file) if not source_lines: source_lines = None except TypeError: source_lines = None # Initialize globals, and merge in extraglobs. if globs is None: if module is None: globs = {} else: globs = module.__dict__.copy() else: globs = globs.copy() if extraglobs is not None: globs.update(extraglobs) # Recursively expore `obj`, extracting DocTests. tests = [] self._find(tests, obj, name, module, source_lines, globs, {}) return tests def _filter(self, obj, prefix, base): """ Return true if the given object should not be examined. """ return (self._namefilter is not None and self._namefilter(prefix, base)) def _from_module(self, module, object): """ Return true if the given object is defined in the given module. """ if module is None: return True elif inspect.isfunction(object): return module.__dict__ is object.func_globals elif inspect.isclass(object): return module.__name__ == object.__module__ elif inspect.getmodule(object) is not None: return module is inspect.getmodule(object) elif hasattr(object, '__module__'): return module.__name__ == object.__module__ elif isinstance(object, property): return True # [XX] no way not be sure. else: raise ValueError("object must be a class or function") def _find(self, tests, obj, name, module, source_lines, globs, seen): """ Find tests for the given object and any contained objects, and add them to `tests`. """ if self._verbose: print 'Finding tests in %s' % name # If we've already processed this object, then ignore it. if id(obj) in seen: return seen[id(obj)] = 1 # Find a test for this object, and add it to the list of tests. test = self._get_test(obj, name, module, globs, source_lines) if test is not None: tests.append(test) # Look for tests in a module's contained objects. if inspect.ismodule(obj) and self._recurse: for valname, val in obj.__dict__.items(): # Check if this contained object should be ignored. if self._filter(val, name, valname): continue valname = '%s.%s' % (name, valname) # Recurse to functions & classes. if ((inspect.isfunction(val) or inspect.isclass(val)) and self._from_module(module, val)): self._find(tests, val, valname, module, source_lines, globs, seen) # Look for tests in a module's __test__ dictionary. if inspect.ismodule(obj) and self._recurse: for valname, val in getattr(obj, '__test__', {}).items(): if not isinstance(valname, basestring): raise ValueError("DocTestFinder.find: __test__ keys " "must be strings: %r" % (type(valname),)) if not (inspect.isfunction(val) or inspect.isclass(val) or inspect.ismethod(val) or inspect.ismodule(val) or isinstance(val, basestring)): raise ValueError("DocTestFinder.find: __test__ values " "must be strings, functions, methods, " "classes, or modules: %r" % (type(val),)) valname = '%s.__test__.%s' % (name, valname) self._find(tests, val, valname, module, source_lines, globs, seen) # Look for tests in a class's contained objects. if inspect.isclass(obj) and self._recurse: for valname, val in obj.__dict__.items(): # Check if this contained object should be ignored. if self._filter(val, name, valname): continue # Special handling for staticmethod/classmethod. if isinstance(val, staticmethod): val = getattr(obj, valname) if isinstance(val, classmethod): val = getattr(obj, valname).im_func # Recurse to methods, properties, and nested classes. if ((inspect.isfunction(val) or inspect.isclass(val) or isinstance(val, property)) and self._from_module(module, val)): valname = '%s.%s' % (name, valname) self._find(tests, val, valname, module, source_lines, globs, seen) def _get_test(self, obj, name, module, globs, source_lines): """ Return a DocTest for the given object, if it defines a docstring; otherwise, return None. """ # Extract the object's docstring. If it doesn't have one, # then return None (no test for this object). if isinstance(obj, basestring): docstring = obj else: try: if obj.__doc__ is None: docstring = '' else: docstring = obj.__doc__ if not isinstance(docstring, basestring): docstring = str(docstring) except (TypeError, AttributeError): docstring = '' # Find the docstring's location in the file. lineno = self._find_lineno(obj, source_lines) # Don't bother if the docstring is empty. if self._exclude_empty and not docstring: return None # Return a DocTest for this object. if module is None: filename = None else: filename = getattr(module, '__file__', module.__name__) if filename[-4:] in (".pyc", ".pyo"): filename = filename[:-1] return self._parser.get_doctest(docstring, globs, name, filename, lineno) def _find_lineno(self, obj, source_lines): """ Return a line number of the given object's docstring. Note: this method assumes that the object has a docstring. """ lineno = None # Find the line number for modules. if inspect.ismodule(obj): lineno = 0 # Find the line number for classes. # Note: this could be fooled if a class is defined multiple # times in a single file. if inspect.isclass(obj): if source_lines is None: return None pat = re.compile(r'^\s*class\s*%s\b' % getattr(obj, '__name__', '-')) for i, line in enumerate(source_lines): if pat.match(line): lineno = i break # Find the line number for functions & methods. if inspect.ismethod(obj): obj = obj.im_func if inspect.isfunction(obj): obj = obj.func_code if inspect.istraceback(obj): obj = obj.tb_frame if inspect.isframe(obj): obj = obj.f_code if inspect.iscode(obj): lineno = getattr(obj, 'co_firstlineno', None)-1 # Find the line number where the docstring starts. Assume # that it's the first line that begins with a quote mark. # Note: this could be fooled by a multiline function # signature, where a continuation line begins with a quote # mark. if lineno is not None: if source_lines is None: return lineno+1 pat = re.compile('(^|.*:)\s*\w*("|\')') for lineno in range(lineno, len(source_lines)): if pat.match(source_lines[lineno]): return lineno # We couldn't find the line number. return None ###################################################################### ## 5. DocTest Runner ###################################################################### class DocTestRunner: """ A class used to run DocTest test cases, and accumulate statistics. The `run` method is used to process a single DocTest case. It returns a tuple `(f, t)`, where `t` is the number of test cases tried, and `f` is the number of test cases that failed. >>> tests = DocTestFinder().find(_TestClass) >>> runner = DocTestRunner(verbose=False) >>> for test in tests: ... print runner.run(test) (0, 2) (0, 1) (0, 2) (0, 2) The `summarize` method prints a summary of all the test cases that have been run by the runner, and returns an aggregated `(f, t)` tuple: >>> runner.summarize(verbose=1) 4 items passed all tests: 2 tests in _TestClass 2 tests in _TestClass.__init__ 2 tests in _TestClass.get 1 tests in _TestClass.square 7 tests in 4 items. 7 passed and 0 failed. Test passed. (0, 7) The aggregated number of tried examples and failed examples is also available via the `tries` and `failures` attributes: >>> runner.tries 7 >>> runner.failures 0 The comparison between expected outputs and actual outputs is done by an `OutputChecker`. This comparison may be customized with a number of option flags; see the documentation for `testmod` for more information. If the option flags are insufficient, then the comparison may also be customized by passing a subclass of `OutputChecker` to the constructor. The test runner's display output can be controlled in two ways. First, an output function (`out) can be passed to `TestRunner.run`; this function will be called with strings that should be displayed. It defaults to `sys.stdout.write`. If capturing the output is not sufficient, then the display output can be also customized by subclassing DocTestRunner, and overriding the methods `report_start`, `report_success`, `report_unexpected_exception`, and `report_failure`. """ # This divider string is used to separate failure messages, and to # separate sections of the summary. DIVIDER = "*" * 70 def __init__(self, checker=None, verbose=None, optionflags=0): """ Create a new test runner. Optional keyword arg `checker` is the `OutputChecker` that should be used to compare the expected outputs and actual outputs of doctest examples. Optional keyword arg 'verbose' prints lots of stuff if true, only failures if false; by default, it's true iff '-v' is in sys.argv. Optional argument `optionflags` can be used to control how the test runner compares expected output to actual output, and how it displays failures. See the documentation for `testmod` for more information. """ self._checker = checker or OutputChecker() if verbose is None: verbose = '-v' in sys.argv self._verbose = verbose self.optionflags = optionflags self.original_optionflags = optionflags # Keep track of the examples we've run. self.tries = 0 self.failures = 0 self._name2ft = {} # Create a fake output target for capturing doctest output. self._fakeout = _SpoofOut() #///////////////////////////////////////////////////////////////// # Reporting methods #///////////////////////////////////////////////////////////////// def report_start(self, out, test, example): """ Report that the test runner is about to process the given example. (Only displays a message if verbose=True) """ if self._verbose: if example.want: out('Trying:\n' + _indent(example.source) + 'Expecting:\n' + _indent(example.want)) else: out('Trying:\n' + _indent(example.source) + 'Expecting nothing\n') def report_success(self, out, test, example, got): """ Report that the given example ran successfully. (Only displays a message if verbose=True) """ if self._verbose: out("ok\n") def report_failure(self, out, test, example, got): """ Report that the given example failed. """ out(self._failure_header(test, example) + self._checker.output_difference(example, got, self.optionflags)) def report_unexpected_exception(self, out, test, example, exc_info): """ Report that the given example raised an unexpected exception. """ out(self._failure_header(test, example) + 'Exception raised:\n' + _indent(_exception_traceback(exc_info))) def _failure_header(self, test, example): out = [self.DIVIDER] if test.filename: if test.lineno is not None and example.lineno is not None: lineno = test.lineno + example.lineno + 1 else: lineno = '?' out.append('File "%s", line %s, in %s' % (test.filename, lineno, test.name)) else: out.append('Line %s, in %s' % (example.lineno+1, test.name)) out.append('Failed example:') source = example.source out.append(_indent(source)) return '\n'.join(out) #///////////////////////////////////////////////////////////////// # DocTest Running #///////////////////////////////////////////////////////////////// def __run(self, test, compileflags, out): """ Run the examples in `test`. Write the outcome of each example with one of the `DocTestRunner.report_*` methods, using the writer function `out`. `compileflags` is the set of compiler flags that should be used to execute examples. Return a tuple `(f, t)`, where `t` is the number of examples tried, and `f` is the number of examples that failed. The examples are run in the namespace `test.globs`. """ # Keep track of the number of failures and tries. failures = tries = 0 # Save the option flags (since option directives can be used # to modify them). original_optionflags = self.optionflags SUCCESS, FAILURE, BOOM = range(3) # `outcome` state check = self._checker.check_output # Process each example. for examplenum, example in enumerate(test.examples): # If REPORT_ONLY_FIRST_FAILURE is set, then supress # reporting after the first failure. quiet = (self.optionflags & REPORT_ONLY_FIRST_FAILURE and failures > 0) # Merge in the example's options. self.optionflags = original_optionflags if example.options: for (optionflag, val) in example.options.items(): if val: self.optionflags |= optionflag else: self.optionflags &= ~optionflag # Record that we started this example. tries += 1 if not quiet: self.report_start(out, test, example) # Use a special filename for compile(), so we can retrieve # the source code during interactive debugging (see # __patched_linecache_getlines). filename = '<doctest %s[%d]>' % (test.name, examplenum) # Run the example in the given context (globs), and record # any exception that gets raised. (But don't intercept # keyboard interrupts.) try: # Don't blink! This is where the user's code gets run. exec compile(example.source, filename, "single", compileflags, 1) in test.globs self.debugger.set_continue() # ==== Example Finished ==== exception = None except KeyboardInterrupt: raise except: exception = sys.exc_info() self.debugger.set_continue() # ==== Example Finished ==== got = self._fakeout.getvalue() # the actual output self._fakeout.truncate(0) outcome = FAILURE # guilty until proved innocent or insane # If the example executed without raising any exceptions, # verify its output. if exception is None: if check(example.want, got, self.optionflags): outcome = SUCCESS # The example raised an exception: check if it was expected. else: exc_info = sys.exc_info() exc_msg = traceback.format_exception_only(*exc_info[:2])[-1] if not quiet: got += _exception_traceback(exc_info) # If `example.exc_msg` is None, then we weren't expecting # an exception. if example.exc_msg is None: outcome = BOOM # We expected an exception: see whether it matches. elif check(example.exc_msg, exc_msg, self.optionflags): outcome = SUCCESS # Another chance if they didn't care about the detail. elif self.optionflags & IGNORE_EXCEPTION_DETAIL: m1 = re.match(r'[^:]*:', example.exc_msg) m2 = re.match(r'[^:]*:', exc_msg) if m1 and m2 and check(m1.group(0), m2.group(0), self.optionflags): outcome = SUCCESS # Report the outcome. if outcome is SUCCESS: if not quiet: self.report_success(out, test, example, got) elif outcome is FAILURE: if not quiet: self.report_failure(out, test, example, got) failures += 1 elif outcome is BOOM: if not quiet: self.report_unexpected_exception(out, test, example, exc_info) failures += 1 else: assert False, ("unknown outcome", outcome) # Restore the option flags (in case they were modified) self.optionflags = original_optionflags # Record and return the number of failures and tries. self.__record_outcome(test, failures, tries) return failures, tries def __record_outcome(self, test, f, t): """ Record the fact that the given DocTest (`test`) generated `f` failures out of `t` tried examples. """ f2, t2 = self._name2ft.get(test.name, (0,0)) self._name2ft[test.name] = (f+f2, t+t2) self.failures += f self.tries += t __LINECACHE_FILENAME_RE = re.compile(r'<doctest ' r'(?P<name>[\w\.]+)' r'\[(?P<examplenum>\d+)\]>$') def __patched_linecache_getlines(self, filename, module_globals=None): m = self.__LINECACHE_FILENAME_RE.match(filename) if m and m.group('name') == self.test.name: example = self.test.examples[int(m.group('examplenum'))] return example.source.splitlines(True) else: return self.save_linecache_getlines(filename)#?, module_globals) def run(self, test, compileflags=None, out=None, clear_globs=True): """ Run the examples in `test`, and display the results using the writer function `out`. The examples are run in the namespace `test.globs`. If `clear_globs` is true (the default), then this namespace will be cleared after the test runs, to help with garbage collection. If you would like to examine the namespace after the test completes, then use `clear_globs=False`. `compileflags` gives the set of flags that should be used by the Python compiler when running the examples. If not specified, then it will default to the set of future-import flags that apply to `globs`. The output of each example is checked using `DocTestRunner.check_output`, and the results are formatted by the `DocTestRunner.report_*` methods. """ self.test = test if compileflags is None: compileflags = _extract_future_flags(test.globs) save_stdout = sys.stdout if out is None: out = save_stdout.write sys.stdout = self._fakeout # Patch pdb.set_trace to restore sys.stdout during interactive # debugging (so it's not still redirected to self._fakeout). # Note that the interactive output will go to *our* # save_stdout, even if that's not the real sys.stdout; this # allows us to write test cases for the set_trace behavior. save_set_trace = pdb.set_trace self.debugger = _OutputRedirectingPdb(save_stdout) self.debugger.reset() pdb.set_trace = self.debugger.set_trace # Patch linecache.getlines, so we can see the example's source # when we're inside the debugger. self.save_linecache_getlines = linecache.getlines linecache.getlines = self.__patched_linecache_getlines try: return self.__run(test, compileflags, out) finally: sys.stdout = save_stdout pdb.set_trace = save_set_trace linecache.getlines = self.save_linecache_getlines if clear_globs: test.globs.clear() #///////////////////////////////////////////////////////////////// # Summarization #///////////////////////////////////////////////////////////////// def summarize(self, verbose=None): """ Print a summary of all the test cases that have been run by this DocTestRunner, and return a tuple `(f, t)`, where `f` is the total number of failed examples, and `t` is the total number of tried examples. The optional `verbose` argument controls how detailed the summary is. If the verbosity is not specified, then the DocTestRunner's verbosity is used. """ if verbose is None: verbose = self._verbose notests = [] passed = [] failed = [] totalt = totalf = 0 for x in self._name2ft.items(): name, (f, t) = x assert f <= t totalt += t totalf += f if t == 0: notests.append(name) elif f == 0: passed.append( (name, t) ) else: failed.append(x) if verbose: if notests: print len(notests), "items had no tests:" notests.sort() for thing in notests: print " ", thing if passed: print len(passed), "items passed all tests:" passed.sort() for thing, count in passed: print " %3d tests in %s" % (count, thing) if failed: print self.DIVIDER print len(failed), "items had failures:" failed.sort() for thing, (f, t) in failed: print " %3d of %3d in %s" % (f, t, thing) if verbose: print totalt, "tests in", len(self._name2ft), "items." print totalt - totalf, "passed and", totalf, "failed." if totalf: print "***Test Failed***", totalf, "failures." elif verbose: print "Test passed." return totalf, totalt #///////////////////////////////////////////////////////////////// # Backward compatibility cruft to maintain doctest.master. #///////////////////////////////////////////////////////////////// def merge(self, other): d = self._name2ft for name, (f, t) in other._name2ft.items(): if name in d: print "*** DocTestRunner.merge: '" + name + "' in both" \ " testers; summing outcomes." f2, t2 = d[name] f = f + f2 t = t + t2 d[name] = f, t class OutputChecker: """ A class used to check the whether the actual output from a doctest example matches the expected output. `OutputChecker` defines two methods: `check_output`, which compares a given pair of outputs, and returns true if they match; and `output_difference`, which returns a string describing the differences between two outputs. """ def check_output(self, want, got, optionflags): """ Return True iff the actual output from an example (`got`) matches the expected output (`want`). These strings are always considered to match if they are identical; but depending on what option flags the test runner is using, several non-exact match types are also possible. See the documentation for `TestRunner` for more information about option flags. """ # Handle the common case first, for efficiency: # if they're string-identical, always return true. if got == want: return True # The values True and False replaced 1 and 0 as the return # value for boolean comparisons in Python 2.3. if not (optionflags & DONT_ACCEPT_TRUE_FOR_1): if (got,want) == ("True\n", "1\n"): return True if (got,want) == ("False\n", "0\n"): return True # <BLANKLINE> can be used as a special sequence to signify a # blank line, unless the DONT_ACCEPT_BLANKLINE flag is used. if not (optionflags & DONT_ACCEPT_BLANKLINE): # Replace <BLANKLINE> in want with a blank line. want = re.sub('(?m)^%s\s*?$' % re.escape(BLANKLINE_MARKER), '', want) # If a line in got contains only spaces, then remove the # spaces. got = re.sub('(?m)^\s*?$', '', got) if got == want: return True # This flag causes doctest to ignore any differences in the # contents of whitespace strings. Note that this can be used # in conjunction with the ELLIPSIS flag. if optionflags & NORMALIZE_WHITESPACE: got = ' '.join(got.split()) want = ' '.join(want.split()) if got == want: return True # The ELLIPSIS flag says to let the sequence "..." in `want` # match any substring in `got`. if optionflags & ELLIPSIS: if _ellipsis_match(want, got): return True # We didn't find any match; return false. return False # Should we do a fancy diff? def _do_a_fancy_diff(self, want, got, optionflags): # Not unless they asked for a fancy diff. if not optionflags & (REPORT_UDIFF | REPORT_CDIFF | REPORT_NDIFF): return False # If expected output uses ellipsis, a meaningful fancy diff is # too hard ... or maybe not. In two real-life failures Tim saw, # a diff was a major help anyway, so this is commented out. # [todo] _ellipsis_match() knows which pieces do and don't match, # and could be the basis for a kick-ass diff in this case. ##if optionflags & ELLIPSIS and ELLIPSIS_MARKER in want: ## return False # ndiff does intraline difference marking, so can be useful even # for 1-line differences. if optionflags & REPORT_NDIFF: return True # The other diff types need at least a few lines to be helpful. return want.count('\n') > 2 and got.count('\n') > 2 def output_difference(self, example, got, optionflags): """ Return a string describing the differences between the expected output for a given example (`example`) and the actual output (`got`). `optionflags` is the set of option flags used to compare `want` and `got`. """ want = example.want # If <BLANKLINE>s are being used, then replace blank lines # with <BLANKLINE> in the actual output string. if not (optionflags & DONT_ACCEPT_BLANKLINE): got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got) # Check if we should use diff. if self._do_a_fancy_diff(want, got, optionflags): # Split want & got into lines. want_lines = want.splitlines(True) # True == keep line ends got_lines = got.splitlines(True) # Use difflib to find their differences. if optionflags & REPORT_UDIFF: diff = difflib.unified_diff(want_lines, got_lines, n=2) diff = list(diff)[2:] # strip the diff header kind = 'unified diff with -expected +actual' elif optionflags & REPORT_CDIFF: diff = difflib.context_diff(want_lines, got_lines, n=2) diff = list(diff)[2:] # strip the diff header kind = 'context diff with expected followed by actual' elif optionflags & REPORT_NDIFF: engine = difflib.Differ(charjunk=difflib.IS_CHARACTER_JUNK) diff = list(engine.compare(want_lines, got_lines)) kind = 'ndiff with -expected +actual' else: assert 0, 'Bad diff option' # Remove trailing whitespace on diff output. diff = [line.rstrip() + '\n' for line in diff] return 'Differences (%s):\n' % kind + _indent(''.join(diff)) # If we're not using diff, then simply list the expected # output followed by the actual output. if want and got: return 'Expected:\n%sGot:\n%s' % (_indent(want), _indent(got)) elif want: return 'Expected:\n%sGot nothing\n' % _indent(want) elif got: return 'Expected nothing\nGot:\n%s' % _indent(got) else: return 'Expected nothing\nGot nothing\n' class DocTestFailure(Exception): """A DocTest example has failed in debugging mode. The exception instance has variables: - test: the DocTest object being run - excample: the Example object that failed - got: the actual output """ def __init__(self, test, example, got): self.test = test self.example = example self.got = got def __str__(self): return str(self.test) class UnexpectedException(Exception): """A DocTest example has encountered an unexpected exception The exception instance has variables: - test: the DocTest object being run - excample: the Example object that failed - exc_info: the exception info """ def __init__(self, test, example, exc_info): self.test = test self.example = example self.exc_info = exc_info def __str__(self): return str(self.test) class DebugRunner(DocTestRunner): r"""Run doc tests but raise an exception as soon as there is a failure. If an unexpected exception occurs, an UnexpectedException is raised. It contains the test, the example, and the original exception: >>> runner = DebugRunner(verbose=False) >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42', ... {}, 'foo', 'foo.py', 0) >>> try: ... runner.run(test) ... except UnexpectedException, failure: ... pass >>> failure.test is test True >>> failure.example.want '42\n' >>> exc_info = failure.exc_info >>> raise exc_info[0], exc_info[1], exc_info[2] Traceback (most recent call last): ... KeyError We wrap the original exception to give the calling application access to the test and example information. If the output doesn't match, then a DocTestFailure is raised: >>> test = DocTestParser().get_doctest(''' ... >>> x = 1 ... >>> x ... 2 ... ''', {}, 'foo', 'foo.py', 0) >>> try: ... runner.run(test) ... except DocTestFailure, failure: ... pass DocTestFailure objects provide access to the test: >>> failure.test is test True As well as to the example: >>> failure.example.want '2\n' and the actual output: >>> failure.got '1\n' If a failure or error occurs, the globals are left intact: >>> del test.globs['__builtins__'] >>> test.globs {'x': 1} >>> test = DocTestParser().get_doctest(''' ... >>> x = 2 ... >>> raise KeyError ... ''', {}, 'foo', 'foo.py', 0) >>> runner.run(test) Traceback (most recent call last): ... UnexpectedException: <DocTest foo from foo.py:0 (2 examples)> >>> del test.globs['__builtins__'] >>> test.globs {'x': 2} But the globals are cleared if there is no error: >>> test = DocTestParser().get_doctest(''' ... >>> x = 2 ... ''', {}, 'foo', 'foo.py', 0) >>> runner.run(test) (0, 1) >>> test.globs {} """ def run(self, test, compileflags=None, out=None, clear_globs=True): r = DocTestRunner.run(self, test, compileflags, out, False) if clear_globs: test.globs.clear() return r def report_unexpected_exception(self, out, test, example, exc_info): raise UnexpectedException(test, example, exc_info) def report_failure(self, out, test, example, got): raise DocTestFailure(test, example, got) ###################################################################### ## 6. Test Functions ###################################################################### # These should be backwards compatible. # For backward compatibility, a global instance of a DocTestRunner # class, updated by testmod. master = None def testmod(m=None, name=None, globs=None, verbose=None, isprivate=None, report=True, optionflags=0, extraglobs=None, raise_on_error=False, exclude_empty=False): """m=None, name=None, globs=None, verbose=None, isprivate=None, report=True, optionflags=0, extraglobs=None, raise_on_error=False, exclude_empty=False Test examples in docstrings in functions and classes reachable from module m (or the current module if m is not supplied), starting with m.__doc__. Unless isprivate is specified, private names are not skipped. Also test examples reachable from dict m.__test__ if it exists and is not None. m.__test__ maps names to functions, classes and strings; function and class docstrings are tested even if the name is private; strings are tested directly, as if they were docstrings. Return (#failures, #tests). See doctest.__doc__ for an overview. Optional keyword arg "name" gives the name of the module; by default use m.__name__. Optional keyword arg "globs" gives a dict to be used as the globals when executing examples; by default, use m.__dict__. A copy of this dict is actually used for each docstring, so that each docstring's examples start with a clean slate. Optional keyword arg "extraglobs" gives a dictionary that should be merged into the globals that are used to execute examples. By default, no extra globals are used. This is new in 2.4. Optional keyword arg "verbose" prints lots of stuff if true, prints only failures if false; by default, it's true iff "-v" is in sys.argv. Optional keyword arg "report" prints a summary at the end when true, else prints nothing at the end. In verbose mode, the summary is detailed, else very brief (in fact, empty if all tests passed). Optional keyword arg "optionflags" or's together module constants, and defaults to 0. This is new in 2.3. Possible values (see the docs for details): DONT_ACCEPT_TRUE_FOR_1 DONT_ACCEPT_BLANKLINE NORMALIZE_WHITESPACE ELLIPSIS IGNORE_EXCEPTION_DETAIL REPORT_UDIFF REPORT_CDIFF REPORT_NDIFF REPORT_ONLY_FIRST_FAILURE Optional keyword arg "raise_on_error" raises an exception on the first unexpected exception or failure. This allows failures to be post-mortem debugged. Deprecated in Python 2.4: Optional keyword arg "isprivate" specifies a function used to determine whether a name is private. The default function is treat all functions as public. Optionally, "isprivate" can be set to doctest.is_private to skip over functions marked as private using the underscore naming convention; see its docs for details. Advanced tomfoolery: testmod runs methods of a local instance of class doctest.Tester, then merges the results into (or creates) global Tester instance doctest.master. Methods of doctest.master can be called directly too, if you want to do something unusual. Passing report=0 to testmod is especially useful then, to delay displaying a summary. Invoke doctest.master.summarize(verbose) when you're done fiddling. """ global master if isprivate is not None: warnings.warn("the isprivate argument is deprecated; " "examine DocTestFinder.find() lists instead", DeprecationWarning) # If no module was given, then use __main__. if m is None: # DWA - m will still be None if this wasn't invoked from the command # line, in which case the following TypeError is about as good an error # as we should expect m = sys.modules.get('__main__') # Check that we were actually given a module. if not inspect.ismodule(m): raise TypeError("testmod: module required; %r" % (m,)) # If no name was given, then use the module's name. if name is None: name = m.__name__ # Find, parse, and run all tests in the given module. finder = DocTestFinder(_namefilter=isprivate, exclude_empty=exclude_empty) if raise_on_error: runner = DebugRunner(verbose=verbose, optionflags=optionflags) else: runner = DocTestRunner(verbose=verbose, optionflags=optionflags) for test in finder.find(m, name, globs=globs, extraglobs=extraglobs): runner.run(test) if report: runner.summarize() if master is None: master = runner else: master.merge(runner) return runner.failures, runner.tries def testfile(filename, module_relative=True, name=None, package=None, globs=None, verbose=None, report=True, optionflags=0, extraglobs=None, raise_on_error=False, parser=DocTestParser()): """ Test examples in the given file. Return (#failures, #tests). Optional keyword arg "module_relative" specifies how filenames should be interpreted: - If "module_relative" is True (the default), then "filename" specifies a module-relative path. By default, this path is relative to the calling module's directory; but if the "package" argument is specified, then it is relative to that package. To ensure os-independence, "filename" should use "/" characters to separate path segments, and should not be an absolute path (i.e., it may not begin with "/"). - If "module_relative" is False, then "filename" specifies an os-specific path. The path may be absolute or relative (to the current working directory). Optional keyword arg "name" gives the name of the test; by default use the file's basename. Optional keyword argument "package" is a Python package or the name of a Python package whose directory should be used as the base directory for a module relative filename. If no package is specified, then the calling module's directory is used as the base directory for module relative filenames. It is an error to specify "package" if "module_relative" is False. Optional keyword arg "globs" gives a dict to be used as the globals when executing examples; by default, use {}. A copy of this dict is actually used for each docstring, so that each docstring's examples start with a clean slate. Optional keyword arg "extraglobs" gives a dictionary that should be merged into the globals that are used to execute examples. By default, no extra globals are used. Optional keyword arg "verbose" prints lots of stuff if true, prints only failures if false; by default, it's true iff "-v" is in sys.argv. Optional keyword arg "report" prints a summary at the end when true, else prints nothing at the end. In verbose mode, the summary is detailed, else very brief (in fact, empty if all tests passed). Optional keyword arg "optionflags" or's together module constants, and defaults to 0. Possible values (see the docs for details): DONT_ACCEPT_TRUE_FOR_1 DONT_ACCEPT_BLANKLINE NORMALIZE_WHITESPACE ELLIPSIS IGNORE_EXCEPTION_DETAIL REPORT_UDIFF REPORT_CDIFF REPORT_NDIFF REPORT_ONLY_FIRST_FAILURE Optional keyword arg "raise_on_error" raises an exception on the first unexpected exception or failure. This allows failures to be post-mortem debugged. Optional keyword arg "parser" specifies a DocTestParser (or subclass) that should be used to extract tests from the files. Advanced tomfoolery: testmod runs methods of a local instance of class doctest.Tester, then merges the results into (or creates) global Tester instance doctest.master. Methods of doctest.master can be called directly too, if you want to do something unusual. Passing report=0 to testmod is especially useful then, to delay displaying a summary. Invoke doctest.master.summarize(verbose) when you're done fiddling. """ global master if package and not module_relative: raise ValueError("Package may only be specified for module-" "relative paths.") # Relativize the path if module_relative: package = _normalize_module(package) filename = _module_relative_path(package, filename) # If no name was given, then use the file's name. if name is None: name = os.path.basename(filename) # Assemble the globals. if globs is None: globs = {} else: globs = globs.copy() if extraglobs is not None: globs.update(extraglobs) if raise_on_error: runner = DebugRunner(verbose=verbose, optionflags=optionflags) else: runner = DocTestRunner(verbose=verbose, optionflags=optionflags) # Read the file, convert it to a test, and run it. s = open(filename).read() test = parser.get_doctest(s, globs, name, filename, 0) runner.run(test) if report: runner.summarize() if master is None: master = runner else: master.merge(runner) return runner.failures, runner.tries def run_docstring_examples(f, globs, verbose=False, name="NoName", compileflags=None, optionflags=0): """ Test examples in the given object's docstring (`f`), using `globs` as globals. Optional argument `name` is used in failure messages. If the optional argument `verbose` is true, then generate output even if there are no failures. `compileflags` gives the set of flags that should be used by the Python compiler when running the examples. If not specified, then it will default to the set of future-import flags that apply to `globs`. Optional keyword arg `optionflags` specifies options for the testing and output. See the documentation for `testmod` for more information. """ # Find, parse, and run all tests in the given module. finder = DocTestFinder(verbose=verbose, recurse=False) runner = DocTestRunner(verbose=verbose, optionflags=optionflags) for test in finder.find(f, name, globs=globs): runner.run(test, compileflags=compileflags) ###################################################################### ## 7. Tester ###################################################################### # This is provided only for backwards compatibility. It's not # actually used in any way. class Tester: def __init__(self, mod=None, globs=None, verbose=None, isprivate=None, optionflags=0): warnings.warn("class Tester is deprecated; " "use class doctest.DocTestRunner instead", DeprecationWarning, stacklevel=2) if mod is None and globs is None: raise TypeError("Tester.__init__: must specify mod or globs") if mod is not None and not inspect.ismodule(mod): raise TypeError("Tester.__init__: mod must be a module; %r" % (mod,)) if globs is None: globs = mod.__dict__ self.globs = globs self.verbose = verbose self.isprivate = isprivate self.optionflags = optionflags self.testfinder = DocTestFinder(_namefilter=isprivate) self.testrunner = DocTestRunner(verbose=verbose, optionflags=optionflags) def runstring(self, s, name): test = DocTestParser().get_doctest(s, self.globs, name, None, None) if self.verbose: print "Running string", name (f,t) = self.testrunner.run(test) if self.verbose: print f, "of", t, "examples failed in string", name return (f,t) def rundoc(self, object, name=None, module=None): f = t = 0 tests = self.testfinder.find(object, name, module=module, globs=self.globs) for test in tests: (f2, t2) = self.testrunner.run(test) (f,t) = (f+f2, t+t2) return (f,t) def rundict(self, d, name, module=None): import new m = new.module(name) m.__dict__.update(d) if module is None: module = False return self.rundoc(m, name, module) def run__test__(self, d, name): import new m = new.module(name) m.__test__ = d return self.rundoc(m, name) def summarize(self, verbose=None): return self.testrunner.summarize(verbose) def merge(self, other): self.testrunner.merge(other.testrunner) ###################################################################### ## 8. Unittest Support ###################################################################### _unittest_reportflags = 0 def set_unittest_reportflags(flags): """Sets the unittest option flags. The old flag is returned so that a runner could restore the old value if it wished to: >>> old = _unittest_reportflags >>> set_unittest_reportflags(REPORT_NDIFF | ... REPORT_ONLY_FIRST_FAILURE) == old True >>> import doctest >>> doctest._unittest_reportflags == (REPORT_NDIFF | ... REPORT_ONLY_FIRST_FAILURE) True Only reporting flags can be set: >>> set_unittest_reportflags(ELLIPSIS) Traceback (most recent call last): ... ValueError: ('Only reporting flags allowed', 8) >>> set_unittest_reportflags(old) == (REPORT_NDIFF | ... REPORT_ONLY_FIRST_FAILURE) True """ global _unittest_reportflags if (flags & REPORTING_FLAGS) != flags: raise ValueError("Only reporting flags allowed", flags) old = _unittest_reportflags _unittest_reportflags = flags return old class DocTestCase(unittest.TestCase): def __init__(self, test, optionflags=0, setUp=None, tearDown=None, checker=None): unittest.TestCase.__init__(self) self._dt_optionflags = optionflags self._dt_checker = checker self._dt_test = test self._dt_setUp = setUp self._dt_tearDown = tearDown def setUp(self): test = self._dt_test if self._dt_setUp is not None: self._dt_setUp(test) def tearDown(self): test = self._dt_test if self._dt_tearDown is not None: self._dt_tearDown(test) test.globs.clear() def runTest(self): test = self._dt_test old = sys.stdout new = StringIO() optionflags = self._dt_optionflags if not (optionflags & REPORTING_FLAGS): # The option flags don't include any reporting flags, # so add the default reporting flags optionflags |= _unittest_reportflags runner = DocTestRunner(optionflags=optionflags, checker=self._dt_checker, verbose=False) try: runner.DIVIDER = "-"*70 failures, tries = runner.run( test, out=new.write, clear_globs=False) finally: sys.stdout = old if failures: raise self.failureException(self.format_failure(new.getvalue())) def format_failure(self, err): test = self._dt_test if test.lineno is None: lineno = 'unknown line number' else: lineno = '%s' % test.lineno lname = '.'.join(test.name.split('.')[-1:]) return ('Failed doctest test for %s\n' ' File "%s", line %s, in %s\n\n%s' % (test.name, test.filename, lineno, lname, err) ) def debug(self): r"""Run the test case without results and without catching exceptions The unit test framework includes a debug method on test cases and test suites to support post-mortem debugging. The test code is run in such a way that errors are not caught. This way a caller can catch the errors and initiate post-mortem debugging. The DocTestCase provides a debug method that raises UnexpectedException errors if there is an unexepcted exception: >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42', ... {}, 'foo', 'foo.py', 0) >>> case = DocTestCase(test) >>> try: ... case.debug() ... except UnexpectedException, failure: ... pass The UnexpectedException contains the test, the example, and the original exception: >>> failure.test is test True >>> failure.example.want '42\n' >>> exc_info = failure.exc_info >>> raise exc_info[0], exc_info[1], exc_info[2] Traceback (most recent call last): ... KeyError If the output doesn't match, then a DocTestFailure is raised: >>> test = DocTestParser().get_doctest(''' ... >>> x = 1 ... >>> x ... 2 ... ''', {}, 'foo', 'foo.py', 0) >>> case = DocTestCase(test) >>> try: ... case.debug() ... except DocTestFailure, failure: ... pass DocTestFailure objects provide access to the test: >>> failure.test is test True As well as to the example: >>> failure.example.want '2\n' and the actual output: >>> failure.got '1\n' """ self.setUp() runner = DebugRunner(optionflags=self._dt_optionflags, checker=self._dt_checker, verbose=False) runner.run(self._dt_test) self.tearDown() def id(self): return self._dt_test.name def __repr__(self): name = self._dt_test.name.split('.') return "%s (%s)" % (name[-1], '.'.join(name[:-1])) __str__ = __repr__ def shortDescription(self): return "Doctest: " + self._dt_test.name def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None, **options): """ Convert doctest tests for a module to a unittest test suite. This converts each documentation string in a module that contains doctest tests to a unittest test case. If any of the tests in a doc string fail, then the test case fails. An exception is raised showing the name of the file containing the test and a (sometimes approximate) line number. The `module` argument provides the module to be tested. The argument can be either a module or a module name. If no argument is given, the calling module is used. A number of options may be provided as keyword arguments: setUp A set-up function. This is called before running the tests in each file. The setUp function will be passed a DocTest object. The setUp function can access the test globals as the globs attribute of the test passed. tearDown A tear-down function. This is called after running the tests in each file. The tearDown function will be passed a DocTest object. The tearDown function can access the test globals as the globs attribute of the test passed. globs A dictionary containing initial global variables for the tests. optionflags A set of doctest option flags expressed as an integer. """ if test_finder is None: test_finder = DocTestFinder() module = _normalize_module(module) tests = test_finder.find(module, globs=globs, extraglobs=extraglobs) if globs is None: globs = module.__dict__ if not tests: # Why do we want to do this? Because it reveals a bug that might # otherwise be hidden. raise ValueError(module, "has no tests") tests.sort() suite = unittest.TestSuite() for test in tests: if len(test.examples) == 0: continue if not test.filename: filename = module.__file__ if filename[-4:] in (".pyc", ".pyo"): filename = filename[:-1] test.filename = filename suite.addTest(DocTestCase(test, **options)) return suite class DocFileCase(DocTestCase): def id(self): return '_'.join(self._dt_test.name.split('.')) def __repr__(self): return self._dt_test.filename __str__ = __repr__ def format_failure(self, err): return ('Failed doctest test for %s\n File "%s", line 0\n\n%s' % (self._dt_test.name, self._dt_test.filename, err) ) def DocFileTest(path, module_relative=True, package=None, globs=None, parser=DocTestParser(), **options): if globs is None: globs = {} if package and not module_relative: raise ValueError("Package may only be specified for module-" "relative paths.") # Relativize the path. if module_relative: package = _normalize_module(package) path = _module_relative_path(package, path) # Find the file and read it. name = os.path.basename(path) doc = open(path).read() # Convert it to a test, and wrap it in a DocFileCase. test = parser.get_doctest(doc, globs, name, path, 0) return DocFileCase(test, **options) def DocFileSuite(*paths, **kw): """A unittest suite for one or more doctest files. The path to each doctest file is given as a string; the interpretation of that string depends on the keyword argument "module_relative". A number of options may be provided as keyword arguments: module_relative If "module_relative" is True, then the given file paths are interpreted as os-independent module-relative paths. By default, these paths are relative to the calling module's directory; but if the "package" argument is specified, then they are relative to that package. To ensure os-independence, "filename" should use "/" characters to separate path segments, and may not be an absolute path (i.e., it may not begin with "/"). If "module_relative" is False, then the given file paths are interpreted as os-specific paths. These paths may be absolute or relative (to the current working directory). package A Python package or the name of a Python package whose directory should be used as the base directory for module relative paths. If "package" is not specified, then the calling module's directory is used as the base directory for module relative filenames. It is an error to specify "package" if "module_relative" is False. setUp A set-up function. This is called before running the tests in each file. The setUp function will be passed a DocTest object. The setUp function can access the test globals as the globs attribute of the test passed. tearDown A tear-down function. This is called after running the tests in each file. The tearDown function will be passed a DocTest object. The tearDown function can access the test globals as the globs attribute of the test passed. globs A dictionary containing initial global variables for the tests. optionflags A set of doctest option flags expressed as an integer. parser A DocTestParser (or subclass) that should be used to extract tests from the files. """ suite = unittest.TestSuite() # We do this here so that _normalize_module is called at the right # level. If it were called in DocFileTest, then this function # would be the caller and we might guess the package incorrectly. if kw.get('module_relative', True): kw['package'] = _normalize_module(kw.get('package')) for path in paths: suite.addTest(DocFileTest(path, **kw)) return suite ###################################################################### ## 9. Debugging Support ###################################################################### def script_from_examples(s): r"""Extract script from text with examples. Converts text with examples to a Python script. Example input is converted to regular code. Example output and all other words are converted to comments: >>> text = ''' ... Here are examples of simple math. ... ... Python has super accurate integer addition ... ... >>> 2 + 2 ... 5 ... ... And very friendly error messages: ... ... >>> 1/0 ... To Infinity ... And ... Beyond ... ... You can use logic if you want: ... ... >>> if 0: ... ... blah ... ... blah ... ... ... ... Ho hum ... ''' >>> print script_from_examples(text) # Here are examples of simple math. # # Python has super accurate integer addition # 2 + 2 # Expected: ## 5 # # And very friendly error messages: # 1/0 # Expected: ## To Infinity ## And ## Beyond # # You can use logic if you want: # if 0: blah blah # # Ho hum """ output = [] for piece in DocTestParser().parse(s): if isinstance(piece, Example): # Add the example's source code (strip trailing NL) output.append(piece.source[:-1]) # Add the expected output: want = piece.want if want: output.append('# Expected:') output += ['## '+l for l in want.split('\n')[:-1]] else: # Add non-example text. output += [_comment_line(l) for l in piece.split('\n')[:-1]] # Trim junk on both ends. while output and output[-1] == '#': output.pop() while output and output[0] == '#': output.pop(0) # Combine the output, and return it. return '\n'.join(output) def testsource(module, name): """Extract the test sources from a doctest docstring as a script. Provide the module (or dotted name of the module) containing the test to be debugged and the name (within the module) of the object with the doc string with tests to be debugged. """ module = _normalize_module(module) tests = DocTestFinder().find(module) test = [t for t in tests if t.name == name] if not test: raise ValueError(name, "not found in tests") test = test[0] testsrc = script_from_examples(test.docstring) return testsrc def debug_src(src, pm=False, globs=None): """Debug a single doctest docstring, in argument `src`'""" testsrc = script_from_examples(src) debug_script(testsrc, pm, globs) def debug_script(src, pm=False, globs=None): "Debug a test script. `src` is the script, as a string." import pdb # Note that tempfile.NameTemporaryFile() cannot be used. As the # docs say, a file so created cannot be opened by name a second time # on modern Windows boxes, and execfile() needs to open it. srcfilename = tempfile.mktemp(".py", "doctestdebug") f = open(srcfilename, 'w') f.write(src) f.close() try: if globs: globs = globs.copy() else: globs = {} if pm: try: execfile(srcfilename, globs, globs) except: print sys.exc_info()[1] pdb.post_mortem(sys.exc_info()[2]) else: # Note that %r is vital here. '%s' instead can, e.g., cause # backslashes to get treated as metacharacters on Windows. pdb.run("execfile(%r)" % srcfilename, globs, globs) finally: os.remove(srcfilename) def debug(module, name, pm=False): """Debug a single doctest docstring. Provide the module (or dotted name of the module) containing the test to be debugged and the name (within the module) of the object with the docstring with tests to be debugged. """ module = _normalize_module(module) testsrc = testsource(module, name) debug_script(testsrc, pm, module.__dict__) ###################################################################### ## 10. Example Usage ###################################################################### class _TestClass: """ A pointless class, for sanity-checking of docstring testing. Methods: square() get() >>> _TestClass(13).get() + _TestClass(-12).get() 1 >>> hex(_TestClass(13).square().get()) '0xa9' """ def __init__(self, val): """val -> _TestClass object with associated value val. >>> t = _TestClass(123) >>> print t.get() 123 """ self.val = val def square(self): """square() -> square TestClass's associated value >>> _TestClass(13).square().get() 169 """ self.val = self.val ** 2 return self def get(self): """get() -> return TestClass's associated value. >>> x = _TestClass(-42) >>> print x.get() -42 """ return self.val __test__ = {"_TestClass": _TestClass, "string": r""" Example of a string object, searched as-is. >>> x = 1; y = 2 >>> x + y, x * y (3, 2) """, "bool-int equivalence": r""" In 2.2, boolean expressions displayed 0 or 1. By default, we still accept them. This can be disabled by passing DONT_ACCEPT_TRUE_FOR_1 to the new optionflags argument. >>> 4 == 4 1 >>> 4 == 4 True >>> 4 > 4 0 >>> 4 > 4 False """, "blank lines": r""" Blank lines can be marked with <BLANKLINE>: >>> print 'foo\n\nbar\n' foo <BLANKLINE> bar <BLANKLINE> """, "ellipsis": r""" If the ellipsis flag is used, then '...' can be used to elide substrings in the desired output: >>> print range(1000) #doctest: +ELLIPSIS [0, 1, 2, ..., 999] """, "whitespace normalization": r""" If the whitespace normalization flag is used, then differences in whitespace are ignored. >>> print range(30) #doctest: +NORMALIZE_WHITESPACE [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29] """, } def _test(): r = unittest.TextTestRunner() r.run(DocTestSuite()) if __name__ == "__main__": _test()
