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"""Loading unittests."""

import os
import re
import sys
import traceback
import types

from functools import cmp_to_key as _CmpToKey
from fnmatch import fnmatch

from . import case, suite

__unittest = True

# what about .pyc or .pyo (etc)
# we would need to avoid loading the same tests multiple times
# from '.py', '.pyc' *and* '.pyo'
VALID_MODULE_NAME = re.compile(r'[_a-z]\w*\.py$', re.IGNORECASE)

def _make_failed_import_test(name, suiteClass):
    message = 'Failed to import test module: %s\n%s' % (name, traceback.format_exc())
    return _make_failed_test('ModuleImportFailure', name, ImportError(message),
                             suiteClass)

def _make_failed_load_tests(name, exception, suiteClass):
    return _make_failed_test('LoadTestsFailure', name, exception, suiteClass)

def _make_failed_test(classname, methodname, exception, suiteClass):
    def testFailure(self):
        raise exception
    attrs = {methodname: testFailure}
    TestClass = type(classname, (case.TestCase,), attrs)
    return suiteClass((TestClass(methodname),))

class TestLoader(object):
    """
    This class is responsible for loading tests according to various criteria
    and returning them wrapped in a TestSuite
    """
    testMethodPrefix = 'test'
    sortTestMethodsUsing = cmp
    suiteClass = suite.TestSuite
    _top_level_dir = None

def loadTestsFromTestCase(self, testCaseClass):
        """Return a suite of all test cases contained in testCaseClass"""
        if issubclass(testCaseClass, suite.TestSuite):
            raise TypeError("Test cases should not be derived from TestSuite." \
                                " Maybe you meant to derive from TestCase?")
        testCaseNames = self.getTestCaseNames(testCaseClass)
        if not testCaseNames and hasattr(testCaseClass, 'runTest'):
            testCaseNames = ['runTest']
        loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
        return loaded_suite

def loadTestsFromModule(self, module, use_load_tests=True):
        """Return a suite of all test cases contained in the given module"""
        tests = []
        for name in dir(module):
            obj = getattr(module, name)
            if isinstance(obj, type) and issubclass(obj, case.TestCase):
                tests.append(self.loadTestsFromTestCase(obj))

load_tests = getattr(module, 'load_tests', None)
        tests = self.suiteClass(tests)
        if use_load_tests and load_tests is not None:
            try:
                return load_tests(self, tests, None)
            except Exception, e:
                return _make_failed_load_tests(module.__name__, e,
                                               self.suiteClass)
        return tests

def loadTestsFromName(self, name, module=None):
        """Return a suite of all test cases given a string specifier.

The name may resolve either to a module, a test case class, a
        test method within a test case class, or a callable object which
        returns a TestCase or TestSuite instance.

The method optionally resolves the names relative to a given module.
        """
        parts = name.split('.')
        if module is None:
            parts_copy = parts[:]
            while parts_copy:
                try:
                    module = __import__('.'.join(parts_copy))
                    break
                except ImportError:
                    del parts_copy[-1]
                    if not parts_copy:
                        raise
            parts = parts[1:]
        obj = module
        for part in parts:
            parent, obj = obj, getattr(obj, part)

if isinstance(obj, types.ModuleType):
            return self.loadTestsFromModule(obj)
        elif isinstance(obj, type) and issubclass(obj, case.TestCase):
            return self.loadTestsFromTestCase(obj)
        elif (isinstance(obj, types.UnboundMethodType) and
              isinstance(parent, type) and
              issubclass(parent, case.TestCase)):
            name = parts[-1]
            inst = parent(name)
            return self.suiteClass([inst])
        elif isinstance(obj, suite.TestSuite):
            return obj
        elif hasattr(obj, '__call__'):
            test = obj()
            if isinstance(test, suite.TestSuite):
                return test
            elif isinstance(test, case.TestCase):
                return self.suiteClass([test])
            else:
                raise TypeError("calling %s returned %s, not a test" %
                                (obj, test))
        else:
            raise TypeError("don't know how to make test from: %s" % obj)

def loadTestsFromNames(self, names, module=None):
        """Return a suite of all test cases found using the given sequence
        of string specifiers. See 'loadTestsFromName()'.
        """
        suites = [self.loadTestsFromName(name, module) for name in names]
        return self.suiteClass(suites)

def getTestCaseNames(self, testCaseClass):
        """Return a sorted sequence of method names found within testCaseClass
        """
        def isTestMethod(attrname, testCaseClass=testCaseClass,
                         prefix=self.testMethodPrefix):
            return attrname.startswith(prefix) and \
                hasattr(getattr(testCaseClass, attrname), '__call__')
        testFnNames = filter(isTestMethod, dir(testCaseClass))
        if self.sortTestMethodsUsing:
            testFnNames.sort(key=_CmpToKey(self.sortTestMethodsUsing))
        return testFnNames

def discover(self, start_dir, pattern='test*.py', top_level_dir=None):
        """Find and return all test modules from the specified start
        directory, recursing into subdirectories to find them. Only test files
        that match the pattern will be loaded. (Using shell style pattern
        matching.)

All test modules must be importable from the top level of the project.
        If the start directory is not the top level directory then the top
        level directory must be specified separately.

If a test package name (directory with '__init__.py') matches the
        pattern then the package will be checked for a 'load_tests' function. If
        this exists then it will be called with loader, tests, pattern.

If load_tests exists then discovery does  *not* recurse into the package,
        load_tests is responsible for loading all tests in the package.

The pattern is deliberately not stored as a loader attribute so that
        packages can continue discovery themselves. top_level_dir is stored so
        load_tests does not need to pass this argument in to loader.discover().
        """
        set_implicit_top = False
        if top_level_dir is None and self._top_level_dir is not None:
            # make top_level_dir optional if called from load_tests in a package
            top_level_dir = self._top_level_dir
        elif top_level_dir is None:
            set_implicit_top = True
            top_level_dir = start_dir

top_level_dir = os.path.abspath(top_level_dir)

if not top_level_dir in sys.path:
            # all test modules must be importable from the top level directory
            # should we *unconditionally* put the start directory in first
            # in sys.path to minimise likelihood of conflicts between installed
            # modules and development versions?
            sys.path.insert(0, top_level_dir)
        self._top_level_dir = top_level_dir

is_not_importable = False
        if os.path.isdir(os.path.abspath(start_dir)):
            start_dir = os.path.abspath(start_dir)
            if start_dir != top_level_dir:
                is_not_importable = not os.path.isfile(os.path.join(start_dir, '__init__.py'))
        else:
            # support for discovery from dotted module names
            try:
                __import__(start_dir)
            except ImportError:
                is_not_importable = True
            else:
                the_module = sys.modules[start_dir]
                top_part = start_dir.split('.')[0]
                start_dir = os.path.abspath(os.path.dirname((the_module.__file__)))
                if set_implicit_top:
                    self._top_level_dir = self._get_directory_containing_module(top_part)
                    sys.path.remove(top_level_dir)

if is_not_importable:
            raise ImportError('Start directory is not importable: %r' % start_dir)

tests = list(self._find_tests(start_dir, pattern))
        return self.suiteClass(tests)

def _get_directory_containing_module(self, module_name):
        module = sys.modules[module_name]
        full_path = os.path.abspath(module.__file__)

if os.path.basename(full_path).lower().startswith('__init__.py'):
            return os.path.dirname(os.path.dirname(full_path))
        else:
            # here we have been given a module rather than a package - so
            # all we can do is search the *same* directory the module is in
            # should an exception be raised instead
            return os.path.dirname(full_path)

def _get_name_from_path(self, path):
        path = os.path.splitext(os.path.normpath(path))[0]

_relpath = os.path.relpath(path, self._top_level_dir)
        assert not os.path.isabs(_relpath), "Path must be within the project"
        assert not _relpath.startswith('..'), "Path must be within the project"

name = _relpath.replace(os.path.sep, '.')
        return name

def _get_module_from_name(self, name):
        __import__(name)
        return sys.modules[name]

def _match_path(self, path, full_path, pattern):
        # override this method to use alternative matching strategy
        return fnmatch(path, pattern)

def _find_tests(self, start_dir, pattern):
        """Used by discovery. Yields test suites it loads."""
        paths = os.listdir(start_dir)

for path in paths:
            full_path = os.path.join(start_dir, path)
            if os.path.isfile(full_path):
                if not VALID_MODULE_NAME.match(path):
                    # valid Python identifiers only
                    continue
                if not self._match_path(path, full_path, pattern):
                    continue
                # if the test file matches, load it
                name = self._get_name_from_path(full_path)
                try:
                    module = self._get_module_from_name(name)
                except:
                    yield _make_failed_import_test(name, self.suiteClass)
                else:
                    mod_file = os.path.abspath(getattr(module, '__file__', full_path))
                    realpath = os.path.splitext(os.path.realpath(mod_file))[0]
                    fullpath_noext = os.path.splitext(os.path.realpath(full_path))[0]
                    if realpath.lower() != fullpath_noext.lower():
                        module_dir = os.path.dirname(realpath)
                        mod_name = os.path.splitext(os.path.basename(full_path))[0]
                        expected_dir = os.path.dirname(full_path)
                        msg = ("%r module incorrectly imported from %r. Expected %r. "
                               "Is this module globally installed?")
                        raise ImportError(msg % (mod_name, module_dir, expected_dir))
                    yield self.loadTestsFromModule(module)
            elif os.path.isdir(full_path):
                if not os.path.isfile(os.path.join(full_path, '__init__.py')):
                    continue

load_tests = None
                tests = None
                if fnmatch(path, pattern):
                    # only check load_tests if the package directory itself matches the filter
                    name = self._get_name_from_path(full_path)
                    package = self._get_module_from_name(name)
                    load_tests = getattr(package, 'load_tests', None)
                    tests = self.loadTestsFromModule(package, use_load_tests=False)

if load_tests is None:
                    if tests is not None:
                        # tests loaded from package file
                        yield tests
                    # recurse into the package
                    for test in self._find_tests(full_path, pattern):
                        yield test
                else:
                    try:
                        yield load_tests(self, tests, pattern)
                    except Exception, e:
                        yield _make_failed_load_tests(package.__name__, e,
                                                      self.suiteClass)

defaultTestLoader = TestLoader()

def _makeLoader(prefix, sortUsing, suiteClass=None):
    loader = TestLoader()
    loader.sortTestMethodsUsing = sortUsing
    loader.testMethodPrefix = prefix
    if suiteClass:
        loader.suiteClass = suiteClass
    return loader

def getTestCaseNames(testCaseClass, prefix, sortUsing=cmp):
    return _makeLoader(prefix, sortUsing).getTestCaseNames(testCaseClass)

def makeSuite(testCaseClass, prefix='test', sortUsing=cmp,
              suiteClass=suite.TestSuite):
    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(testCaseClass)

def findTestCases(module, prefix='test', sortUsing=cmp,
                  suiteClass=suite.TestSuite):
    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(module)

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✏️ loader.py