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selector.py
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""" Test Selection -------------- Test selection is handled by a Selector. The test loader calls the appropriate selector method for each object it encounters that it thinks may be a test. """ import logging import os import unittest from nose.config import Config from nose.util import split_test_name, src, getfilename, getpackage, ispackage, is_executable log = logging.getLogger(__name__) __all__ = ['Selector', 'defaultSelector', 'TestAddress'] # for efficiency and easier mocking op_join = os.path.join op_basename = os.path.basename op_exists = os.path.exists op_splitext = os.path.splitext op_isabs = os.path.isabs op_abspath = os.path.abspath class Selector(object): """Core test selector. Examines test candidates and determines whether, given the specified configuration, the test candidate should be selected as a test. """ def __init__(self, config): if config is None: config = Config() self.configure(config) def configure(self, config): self.config = config self.exclude = config.exclude self.ignoreFiles = config.ignoreFiles self.include = config.include self.plugins = config.plugins self.match = config.testMatch def matches(self, name): """Does the name match my requirements? To match, a name must match config.testMatch OR config.include and it must not match config.exclude """ return ((self.match.search(name) or (self.include and [_f for _f in [inc.search(name) for inc in self.include] if _f])) and ((not self.exclude) or not [_f for _f in [exc.search(name) for exc in self.exclude] if _f] )) def wantClass(self, cls): """Is the class a wanted test class? A class must be a unittest.TestCase subclass, or match test name requirements. Classes that start with _ are always excluded. """ declared = getattr(cls, '__test__', None) if declared is not None: wanted = declared else: wanted = (not cls.__name__.startswith('_') and (issubclass(cls, unittest.TestCase) or self.matches(cls.__name__))) plug_wants = self.plugins.wantClass(cls) if plug_wants is not None: log.debug("Plugin setting selection of %s to %s", cls, plug_wants) wanted = plug_wants log.debug("wantClass %s? %s", cls, wanted) return wanted def wantDirectory(self, dirname): """Is the directory a wanted test directory? All package directories match, so long as they do not match exclude. All other directories must match test requirements. """ tail = op_basename(dirname) if ispackage(dirname): wanted = (not self.exclude or not [_f for _f in [exc.search(tail) for exc in self.exclude] if _f]) else: wanted = (self.matches(tail) or (self.config.srcDirs and tail in self.config.srcDirs)) plug_wants = self.plugins.wantDirectory(dirname) if plug_wants is not None: log.debug("Plugin setting selection of %s to %s", dirname, plug_wants) wanted = plug_wants log.debug("wantDirectory %s? %s", dirname, wanted) return wanted def wantFile(self, file): """Is the file a wanted test file? The file must be a python source file and match testMatch or include, and not match exclude. Files that match ignore are *never* wanted, regardless of plugin, testMatch, include or exclude settings. """ # never, ever load files that match anything in ignore # (.* _* and *setup*.py by default) base = op_basename(file) ignore_matches = [ ignore_this for ignore_this in self.ignoreFiles if ignore_this.search(base) ] if ignore_matches: log.debug('%s matches ignoreFiles pattern; skipped', base) return False if not self.config.includeExe and is_executable(file): log.info('%s is executable; skipped', file) return False dummy, ext = op_splitext(base) pysrc = ext == '.py' wanted = pysrc and self.matches(base) plug_wants = self.plugins.wantFile(file) if plug_wants is not None: log.debug("plugin setting want %s to %s", file, plug_wants) wanted = plug_wants log.debug("wantFile %s? %s", file, wanted) return wanted def wantFunction(self, function): """Is the function a test function? """ try: if hasattr(function, 'compat_func_name'): funcname = function.compat_func_name else: funcname = function.__name__ except AttributeError: # not a function return False declared = getattr(function, '__test__', None) if declared is not None: wanted = declared else: wanted = not funcname.startswith('_') and self.matches(funcname) plug_wants = self.plugins.wantFunction(function) if plug_wants is not None: wanted = plug_wants log.debug("wantFunction %s? %s", function, wanted) return wanted def wantMethod(self, method): """Is the method a test method? """ try: method_name = method.__name__ except AttributeError: # not a method return False if method_name.startswith('_'): # never collect 'private' methods return False declared = getattr(method, '__test__', None) if declared is not None: wanted = declared else: wanted = self.matches(method_name) plug_wants = self.plugins.wantMethod(method) if plug_wants is not None: wanted = plug_wants log.debug("wantMethod %s? %s", method, wanted) return wanted def wantModule(self, module): """Is the module a test module? The tail of the module name must match test requirements. One exception: we always want __main__. """ declared = getattr(module, '__test__', None) if declared is not None: wanted = declared else: wanted = self.matches(module.__name__.split('.')[-1]) \ or module.__name__ == '__main__' plug_wants = self.plugins.wantModule(module) if plug_wants is not None: wanted = plug_wants log.debug("wantModule %s? %s", module, wanted) return wanted defaultSelector = Selector class TestAddress(object): """A test address represents a user's request to run a particular test. The user may specify a filename or module (or neither), and/or a callable (a class, function, or method). The naming format for test addresses is: filename_or_module:callable Filenames that are not absolute will be made absolute relative to the working dir. The filename or module part will be considered a module name if it doesn't look like a file, that is, if it doesn't exist on the file system and it doesn't contain any directory separators and it doesn't end in .py. Callables may be a class name, function name, method name, or class.method specification. """ def __init__(self, name, workingDir=None): if workingDir is None: workingDir = os.getcwd() self.name = name self.workingDir = workingDir self.filename, self.module, self.call = split_test_name(name) log.debug('Test name %s resolved to file %s, module %s, call %s', name, self.filename, self.module, self.call) if self.filename is None: if self.module is not None: self.filename = getfilename(self.module, self.workingDir) if self.filename: self.filename = src(self.filename) if not op_isabs(self.filename): self.filename = op_abspath(op_join(workingDir, self.filename)) if self.module is None: self.module = getpackage(self.filename) log.debug( 'Final resolution of test name %s: file %s module %s call %s', name, self.filename, self.module, self.call) def totuple(self): return (self.filename, self.module, self.call) def __str__(self): return self.name def __repr__(self): return "%s: (%s, %s, %s)" % (self.name, self.filename, self.module, self.call)