summaryrefslogtreecommitdiffstats
path: root/Lib/unittest/test/test_discovery.py
blob: f12e8983cdb129ec1c1a0a565b42befb853de177 (plain)
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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
import os
import re
import sys
import types
import pickle
import builtins
from test import support

import unittest
import unittest.test


class TestableTestProgram(unittest.TestProgram):
    module = None
    exit = True
    defaultTest = failfast = catchbreak = buffer = None
    verbosity = 1
    progName = ''
    testRunner = testLoader = None

    def __init__(self):
        pass


class TestDiscovery(unittest.TestCase):

    # Heavily mocked tests so I can avoid hitting the filesystem
    def test_get_name_from_path(self):
        loader = unittest.TestLoader()
        loader._top_level_dir = '/foo'
        name = loader._get_name_from_path('/foo/bar/baz.py')
        self.assertEqual(name, 'bar.baz')

        if not __debug__:
            # asserts are off
            return

        with self.assertRaises(AssertionError):
            loader._get_name_from_path('/bar/baz.py')

    def test_find_tests(self):
        loader = unittest.TestLoader()

        original_listdir = os.listdir
        def restore_listdir():
            os.listdir = original_listdir
        original_isfile = os.path.isfile
        def restore_isfile():
            os.path.isfile = original_isfile
        original_isdir = os.path.isdir
        def restore_isdir():
            os.path.isdir = original_isdir

        path_lists = [['test2.py', 'test1.py', 'not_a_test.py', 'test_dir',
                       'test.foo', 'test-not-a-module.py', 'another_dir'],
                      ['test4.py', 'test3.py', ]]
        os.listdir = lambda path: path_lists.pop(0)
        self.addCleanup(restore_listdir)

        def isdir(path):
            return path.endswith('dir')
        os.path.isdir = isdir
        self.addCleanup(restore_isdir)

        def isfile(path):
            # another_dir is not a package and so shouldn't be recursed into
            return not path.endswith('dir') and not 'another_dir' in path
        os.path.isfile = isfile
        self.addCleanup(restore_isfile)

        loader._get_module_from_name = lambda path: path + ' module'
        loader.loadTestsFromModule = lambda module: module + ' tests'

        top_level = os.path.abspath('/foo')
        loader._top_level_dir = top_level
        suite = list(loader._find_tests(top_level, 'test*.py'))

        # The test suites found should be sorted alphabetically for reliable
        # execution order.
        expected = [name + ' module tests' for name in
                    ('test1', 'test2')]
        expected.extend([('test_dir.%s' % name) + ' module tests' for name in
                    ('test3', 'test4')])
        self.assertEqual(suite, expected)

    def test_find_tests_with_package(self):
        loader = unittest.TestLoader()

        original_listdir = os.listdir
        def restore_listdir():
            os.listdir = original_listdir
        original_isfile = os.path.isfile
        def restore_isfile():
            os.path.isfile = original_isfile
        original_isdir = os.path.isdir
        def restore_isdir():
            os.path.isdir = original_isdir

        directories = ['a_directory', 'test_directory', 'test_directory2']
        path_lists = [directories, [], [], []]
        os.listdir = lambda path: path_lists.pop(0)
        self.addCleanup(restore_listdir)

        os.path.isdir = lambda path: True
        self.addCleanup(restore_isdir)

        os.path.isfile = lambda path: os.path.basename(path) not in directories
        self.addCleanup(restore_isfile)

        class Module(object):
            paths = []
            load_tests_args = []

            def __init__(self, path):
                self.path = path
                self.paths.append(path)
                if os.path.basename(path) == 'test_directory':
                    def load_tests(loader, tests, pattern):
                        self.load_tests_args.append((loader, tests, pattern))
                        return 'load_tests'
                    self.load_tests = load_tests

            def __eq__(self, other):
                return self.path == other.path

        loader._get_module_from_name = lambda name: Module(name)
        def loadTestsFromModule(module, use_load_tests):
            if use_load_tests:
                raise self.failureException('use_load_tests should be False for packages')
            return module.path + ' module tests'
        loader.loadTestsFromModule = loadTestsFromModule

        loader._top_level_dir = '/foo'
        # this time no '.py' on the pattern so that it can match
        # a test package
        suite = list(loader._find_tests('/foo', 'test*'))

        # We should have loaded tests from the test_directory package by calling load_tests
        # and directly from the test_directory2 package
        self.assertEqual(suite,
                         ['load_tests', 'test_directory2' + ' module tests'])
        # The test module paths should be sorted for reliable execution order
        self.assertEqual(Module.paths, ['test_directory', 'test_directory2'])

        # load_tests should have been called once with loader, tests and pattern
        self.assertEqual(Module.load_tests_args,
                         [(loader, 'test_directory' + ' module tests', 'test*')])

    def test_discover(self):
        loader = unittest.TestLoader()

        original_isfile = os.path.isfile
        original_isdir = os.path.isdir
        def restore_isfile():
            os.path.isfile = original_isfile

        os.path.isfile = lambda path: False
        self.addCleanup(restore_isfile)

        orig_sys_path = sys.path[:]
        def restore_path():
            sys.path[:] = orig_sys_path
        self.addCleanup(restore_path)

        full_path = os.path.abspath(os.path.normpath('/foo'))
        with self.assertRaises(ImportError):
            loader.discover('/foo/bar', top_level_dir='/foo')

        self.assertEqual(loader._top_level_dir, full_path)
        self.assertIn(full_path, sys.path)

        os.path.isfile = lambda path: True
        os.path.isdir = lambda path: True

        def restore_isdir():
            os.path.isdir = original_isdir
        self.addCleanup(restore_isdir)

        _find_tests_args = []
        def _find_tests(start_dir, pattern, namespace=None):
            _find_tests_args.append((start_dir, pattern))
            return ['tests']
        loader._find_tests = _find_tests
        loader.suiteClass = str

        suite = loader.discover('/foo/bar/baz', 'pattern', '/foo/bar')

        top_level_dir = os.path.abspath('/foo/bar')
        start_dir = os.path.abspath('/foo/bar/baz')
        self.assertEqual(suite, "['tests']")
        self.assertEqual(loader._top_level_dir, top_level_dir)
        self.assertEqual(_find_tests_args, [(start_dir, 'pattern')])
        self.assertIn(top_level_dir, sys.path)

    def setup_import_issue_tests(self, fakefile):
        listdir = os.listdir
        os.listdir = lambda _: [fakefile]
        isfile = os.path.isfile
        os.path.isfile = lambda _: True
        orig_sys_path = sys.path[:]
        def restore():
            os.path.isfile = isfile
            os.listdir = listdir
            sys.path[:] = orig_sys_path
        self.addCleanup(restore)

    def test_discover_with_modules_that_fail_to_import(self):
        loader = unittest.TestLoader()

        self.setup_import_issue_tests('test_this_does_not_exist.py')

        suite = loader.discover('.')
        self.assertIn(os.getcwd(), sys.path)
        self.assertEqual(suite.countTestCases(), 1)
        test = list(list(suite)[0])[0] # extract test from suite

        with self.assertRaises(ImportError):
            test.test_this_does_not_exist()

        # Check picklability
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            pickle.loads(pickle.dumps(test, proto))

    def test_discover_with_module_that_raises_SkipTest_on_import(self):
        loader = unittest.TestLoader()

        def _get_module_from_name(name):
            raise unittest.SkipTest('skipperoo')
        loader._get_module_from_name = _get_module_from_name

        self.setup_import_issue_tests('test_skip_dummy.py')

        suite = loader.discover('.')
        self.assertEqual(suite.countTestCases(), 1)

        result = unittest.TestResult()
        suite.run(result)
        self.assertEqual(len(result.skipped), 1)

        # Check picklability
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            pickle.loads(pickle.dumps(suite, proto))

    def test_command_line_handling_parseArgs(self):
        program = TestableTestProgram()

        args = []
        program._do_discovery = args.append
        program.parseArgs(['something', 'discover'])
        self.assertEqual(args, [[]])

        args[:] = []
        program.parseArgs(['something', 'discover', 'foo', 'bar'])
        self.assertEqual(args, [['foo', 'bar']])

    def test_command_line_handling_discover_by_default(self):
        program = TestableTestProgram()

        args = []
        program._do_discovery = args.append
        program.parseArgs(['something'])
        self.assertEqual(args, [[]])
        self.assertEqual(program.verbosity, 1)
        self.assertIs(program.buffer, False)
        self.assertIs(program.catchbreak, False)
        self.assertIs(program.failfast, False)

    def test_command_line_handling_discover_by_default_with_options(self):
        program = TestableTestProgram()

        args = []
        program._do_discovery = args.append
        program.parseArgs(['something', '-v', '-b', '-v', '-c', '-f'])
        self.assertEqual(args, [[]])
        self.assertEqual(program.verbosity, 2)
        self.assertIs(program.buffer, True)
        self.assertIs(program.catchbreak, True)
        self.assertIs(program.failfast, True)


    def test_command_line_handling_do_discovery_too_many_arguments(self):
        program = TestableTestProgram()
        program.testLoader = None

        with support.captured_stderr() as stderr, \
             self.assertRaises(SystemExit) as cm:
            # too many args
            program._do_discovery(['one', 'two', 'three', 'four'])
        self.assertEqual(cm.exception.args, (2,))
        self.assertIn('usage:', stderr.getvalue())


    def test_command_line_handling_do_discovery_uses_default_loader(self):
        program = object.__new__(unittest.TestProgram)
        program._initArgParsers()

        class Loader(object):
            args = []
            def discover(self, start_dir, pattern, top_level_dir):
                self.args.append((start_dir, pattern, top_level_dir))
                return 'tests'

        program.testLoader = Loader()
        program._do_discovery(['-v'])
        self.assertEqual(Loader.args, [('.', 'test*.py', None)])

    def test_command_line_handling_do_discovery_calls_loader(self):
        program = TestableTestProgram()

        class Loader(object):
            args = []
            def discover(self, start_dir, pattern, top_level_dir):
                self.args.append((start_dir, pattern, top_level_dir))
                return 'tests'

        program._do_discovery(['-v'], Loader=Loader)
        self.assertEqual(program.verbosity, 2)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('.', 'test*.py', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['--verbose'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('.', 'test*.py', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery([], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('.', 'test*.py', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['fish'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('fish', 'test*.py', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['fish', 'eggs'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('fish', 'eggs', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['fish', 'eggs', 'ham'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('fish', 'eggs', 'ham')])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['-s', 'fish'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('fish', 'test*.py', None)])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['-t', 'fish'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('.', 'test*.py', 'fish')])

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['-p', 'fish'], Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('.', 'fish', None)])
        self.assertFalse(program.failfast)
        self.assertFalse(program.catchbreak)

        Loader.args = []
        program = TestableTestProgram()
        program._do_discovery(['-p', 'eggs', '-s', 'fish', '-v', '-f', '-c'],
                              Loader=Loader)
        self.assertEqual(program.test, 'tests')
        self.assertEqual(Loader.args, [('fish', 'eggs', None)])
        self.assertEqual(program.verbosity, 2)
        self.assertTrue(program.failfast)
        self.assertTrue(program.catchbreak)

    def setup_module_clash(self):
        class Module(object):
            __file__ = 'bar/foo.py'
        sys.modules['foo'] = Module
        full_path = os.path.abspath('foo')
        original_listdir = os.listdir
        original_isfile = os.path.isfile
        original_isdir = os.path.isdir

        def cleanup():
            os.listdir = original_listdir
            os.path.isfile = original_isfile
            os.path.isdir = original_isdir
            del sys.modules['foo']
            if full_path in sys.path:
                sys.path.remove(full_path)
        self.addCleanup(cleanup)

        def listdir(_):
            return ['foo.py']
        def isfile(_):
            return True
        def isdir(_):
            return True
        os.listdir = listdir
        os.path.isfile = isfile
        os.path.isdir = isdir
        return full_path

    def test_detect_module_clash(self):
        full_path = self.setup_module_clash()
        loader = unittest.TestLoader()

        mod_dir = os.path.abspath('bar')
        expected_dir = os.path.abspath('foo')
        msg = re.escape(r"'foo' module incorrectly imported from %r. Expected %r. "
                "Is this module globally installed?" % (mod_dir, expected_dir))
        self.assertRaisesRegex(
            ImportError, '^%s$' % msg, loader.discover,
            start_dir='foo', pattern='foo.py'
        )
        self.assertEqual(sys.path[0], full_path)

    def test_module_symlink_ok(self):
        full_path = self.setup_module_clash()

        original_realpath = os.path.realpath

        mod_dir = os.path.abspath('bar')
        expected_dir = os.path.abspath('foo')

        def cleanup():
            os.path.realpath = original_realpath
        self.addCleanup(cleanup)

        def realpath(path):
            if path == os.path.join(mod_dir, 'foo.py'):
                return os.path.join(expected_dir, 'foo.py')
            return path
        os.path.realpath = realpath
        loader = unittest.TestLoader()
        loader.discover(start_dir='foo', pattern='foo.py')

    def test_discovery_from_dotted_path(self):
        loader = unittest.TestLoader()

        tests = [self]
        expectedPath = os.path.abspath(os.path.dirname(unittest.test.__file__))

        self.wasRun = False
        def _find_tests(start_dir, pattern, namespace=None):
            self.wasRun = True
            self.assertEqual(start_dir, expectedPath)
            return tests
        loader._find_tests = _find_tests
        suite = loader.discover('unittest.test')
        self.assertTrue(self.wasRun)
        self.assertEqual(suite._tests, tests)


    def test_discovery_from_dotted_path_builtin_modules(self):

        loader = unittest.TestLoader()

        listdir = os.listdir
        os.listdir = lambda _: ['test_this_does_not_exist.py']
        isfile = os.path.isfile
        isdir = os.path.isdir
        os.path.isdir = lambda _: False
        orig_sys_path = sys.path[:]
        def restore():
            os.path.isfile = isfile
            os.path.isdir = isdir
            os.listdir = listdir
            sys.path[:] = orig_sys_path
        self.addCleanup(restore)

        with self.assertRaises(TypeError) as cm:
            loader.discover('sys')
        self.assertEqual(str(cm.exception),
                         'Can not use builtin modules '
                         'as dotted module names')

    def test_discovery_from_dotted_namespace_packages(self):
        loader = unittest.TestLoader()

        orig_import = __import__
        package = types.ModuleType('package')
        package.__path__ = ['/a', '/b']
        package.__spec__ = types.SimpleNamespace(
           loader=None,
           submodule_search_locations=['/a', '/b']
        )

        def _import(packagename, *args, **kwargs):
            sys.modules[packagename] = package
            return package

        def cleanup():
            builtins.__import__ = orig_import
        self.addCleanup(cleanup)
        builtins.__import__ = _import

        _find_tests_args = []
        def _find_tests(start_dir, pattern, namespace=None):
            _find_tests_args.append((start_dir, pattern))
            return ['%s/tests' % start_dir]

        loader._find_tests = _find_tests
        loader.suiteClass = list
        suite = loader.discover('package')
        self.assertEqual(suite, ['/a/tests', '/b/tests'])

    def test_discovery_failed_discovery(self):
        loader = unittest.TestLoader()
        package = types.ModuleType('package')
        orig_import = __import__

        def _import(packagename, *args, **kwargs):
            sys.modules[packagename] = package
            return package

        def cleanup():
            builtins.__import__ = orig_import
        self.addCleanup(cleanup)
        builtins.__import__ = _import

        with self.assertRaises(TypeError) as cm:
            loader.discover('package')
        self.assertEqual(str(cm.exception),
                         'don\'t know how to discover from {!r}'
                         .format(package))


if __name__ == '__main__':
    unittest.main()