summaryrefslogtreecommitdiff
path: root/Lib/test/test_compileall.py
blob: 2356efcaec78bebb5d1c06284e1e9aca63af8ee9 (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
537
538
539
540
541
542
543
544
545
546
547
import sys
import compileall
import importlib.util
import test.test_importlib.util
import os
import pathlib
import py_compile
import shutil
import struct
import tempfile
import time
import unittest
import io

from unittest import mock, skipUnless
try:
    from concurrent.futures import ProcessPoolExecutor
    _have_multiprocessing = True
except ImportError:
    _have_multiprocessing = False

from test import support
from test.support import script_helper

class CompileallTests(unittest.TestCase):

    def setUp(self):
        self.directory = tempfile.mkdtemp()
        self.source_path = os.path.join(self.directory, '_test.py')
        self.bc_path = importlib.util.cache_from_source(self.source_path)
        with open(self.source_path, 'w') as file:
            file.write('x = 123\n')
        self.source_path2 = os.path.join(self.directory, '_test2.py')
        self.bc_path2 = importlib.util.cache_from_source(self.source_path2)
        shutil.copyfile(self.source_path, self.source_path2)
        self.subdirectory = os.path.join(self.directory, '_subdir')
        os.mkdir(self.subdirectory)
        self.source_path3 = os.path.join(self.subdirectory, '_test3.py')
        shutil.copyfile(self.source_path, self.source_path3)

    def tearDown(self):
        shutil.rmtree(self.directory)

    def add_bad_source_file(self):
        self.bad_source_path = os.path.join(self.directory, '_test_bad.py')
        with open(self.bad_source_path, 'w') as file:
            file.write('x (\n')

    def data(self):
        with open(self.bc_path, 'rb') as file:
            data = file.read(8)
        mtime = int(os.stat(self.source_path).st_mtime)
        compare = struct.pack('<4sl', importlib.util.MAGIC_NUMBER, mtime)
        return data, compare

    @unittest.skipUnless(hasattr(os, 'stat'), 'test needs os.stat()')
    def recreation_check(self, metadata):
        """Check that compileall recreates bytecode when the new metadata is
        used."""
        py_compile.compile(self.source_path)
        self.assertEqual(*self.data())
        with open(self.bc_path, 'rb') as file:
            bc = file.read()[len(metadata):]
        with open(self.bc_path, 'wb') as file:
            file.write(metadata)
            file.write(bc)
        self.assertNotEqual(*self.data())
        compileall.compile_dir(self.directory, force=False, quiet=True)
        self.assertTrue(*self.data())

    def test_mtime(self):
        # Test a change in mtime leads to a new .pyc.
        self.recreation_check(struct.pack('<4sl', importlib.util.MAGIC_NUMBER,
                                          1))

    def test_magic_number(self):
        # Test a change in mtime leads to a new .pyc.
        self.recreation_check(b'\0\0\0\0')

    def test_compile_files(self):
        # Test compiling a single file, and complete directory
        for fn in (self.bc_path, self.bc_path2):
            try:
                os.unlink(fn)
            except:
                pass
        self.assertTrue(compileall.compile_file(self.source_path,
                                                force=False, quiet=True))
        self.assertTrue(os.path.isfile(self.bc_path) and
                        not os.path.isfile(self.bc_path2))
        os.unlink(self.bc_path)
        self.assertTrue(compileall.compile_dir(self.directory, force=False,
                                               quiet=True))
        self.assertTrue(os.path.isfile(self.bc_path) and
                        os.path.isfile(self.bc_path2))
        os.unlink(self.bc_path)
        os.unlink(self.bc_path2)
        # Test against bad files
        self.add_bad_source_file()
        self.assertFalse(compileall.compile_file(self.bad_source_path,
                                                 force=False, quiet=2))
        self.assertFalse(compileall.compile_dir(self.directory,
                                                force=False, quiet=2))

    def test_compile_file_pathlike(self):
        self.assertFalse(os.path.isfile(self.bc_path))
        # we should also test the output
        with support.captured_stdout() as stdout:
            self.assertTrue(compileall.compile_file(pathlib.Path(self.source_path)))
        self.assertRegex(stdout.getvalue(), r'Compiling ([^WindowsPath|PosixPath].*)')
        self.assertTrue(os.path.isfile(self.bc_path))

    def test_compile_file_pathlike_ddir(self):
        self.assertFalse(os.path.isfile(self.bc_path))
        self.assertTrue(compileall.compile_file(pathlib.Path(self.source_path),
                                                ddir=pathlib.Path('ddir_path'),
                                                quiet=2))
        self.assertTrue(os.path.isfile(self.bc_path))

    def test_compile_path(self):
        with test.test_importlib.util.import_state(path=[self.directory]):
            self.assertTrue(compileall.compile_path(quiet=2))

        with test.test_importlib.util.import_state(path=[self.directory]):
            self.add_bad_source_file()
            self.assertFalse(compileall.compile_path(skip_curdir=False,
                                                     force=True, quiet=2))

    def test_no_pycache_in_non_package(self):
        # Bug 8563 reported that __pycache__ directories got created by
        # compile_file() for non-.py files.
        data_dir = os.path.join(self.directory, 'data')
        data_file = os.path.join(data_dir, 'file')
        os.mkdir(data_dir)
        # touch data/file
        with open(data_file, 'w'):
            pass
        compileall.compile_file(data_file)
        self.assertFalse(os.path.exists(os.path.join(data_dir, '__pycache__')))

    def test_optimize(self):
        # make sure compiling with different optimization settings than the
        # interpreter's creates the correct file names
        optimize, opt = (1, 1) if __debug__ else (0, '')
        compileall.compile_dir(self.directory, quiet=True, optimize=optimize)
        cached = importlib.util.cache_from_source(self.source_path,
                                                  optimization=opt)
        self.assertTrue(os.path.isfile(cached))
        cached2 = importlib.util.cache_from_source(self.source_path2,
                                                   optimization=opt)
        self.assertTrue(os.path.isfile(cached2))
        cached3 = importlib.util.cache_from_source(self.source_path3,
                                                   optimization=opt)
        self.assertTrue(os.path.isfile(cached3))

    def test_compile_dir_pathlike(self):
        self.assertFalse(os.path.isfile(self.bc_path))
        with support.captured_stdout() as stdout:
            compileall.compile_dir(pathlib.Path(self.directory))
        line = stdout.getvalue().splitlines()[0]
        self.assertRegex(line, r'Listing ([^WindowsPath|PosixPath].*)')
        self.assertTrue(os.path.isfile(self.bc_path))

    @mock.patch('compileall.ProcessPoolExecutor')
    def test_compile_pool_called(self, pool_mock):
        compileall.compile_dir(self.directory, quiet=True, workers=5)
        self.assertTrue(pool_mock.called)

    def test_compile_workers_non_positive(self):
        with self.assertRaisesRegex(ValueError,
                                    "workers must be greater or equal to 0"):
            compileall.compile_dir(self.directory, workers=-1)

    @mock.patch('compileall.ProcessPoolExecutor')
    def test_compile_workers_cpu_count(self, pool_mock):
        compileall.compile_dir(self.directory, quiet=True, workers=0)
        self.assertEqual(pool_mock.call_args[1]['max_workers'], None)

    @mock.patch('compileall.ProcessPoolExecutor')
    @mock.patch('compileall.compile_file')
    def test_compile_one_worker(self, compile_file_mock, pool_mock):
        compileall.compile_dir(self.directory, quiet=True)
        self.assertFalse(pool_mock.called)
        self.assertTrue(compile_file_mock.called)

    @mock.patch('compileall.ProcessPoolExecutor', new=None)
    @mock.patch('compileall.compile_file')
    def test_compile_missing_multiprocessing(self, compile_file_mock):
        compileall.compile_dir(self.directory, quiet=True, workers=5)
        self.assertTrue(compile_file_mock.called)

class EncodingTest(unittest.TestCase):
    """Issue 6716: compileall should escape source code when printing errors
    to stdout."""

    def setUp(self):
        self.directory = tempfile.mkdtemp()
        self.source_path = os.path.join(self.directory, '_test.py')
        with open(self.source_path, 'w', encoding='utf-8') as file:
            file.write('# -*- coding: utf-8 -*-\n')
            file.write('print u"\u20ac"\n')

    def tearDown(self):
        shutil.rmtree(self.directory)

    def test_error(self):
        try:
            orig_stdout = sys.stdout
            sys.stdout = io.TextIOWrapper(io.BytesIO(),encoding='ascii')
            compileall.compile_dir(self.directory)
        finally:
            sys.stdout = orig_stdout


class CommandLineTests(unittest.TestCase):
    """Test compileall's CLI."""

    @classmethod
    def setUpClass(cls):
        for path in filter(os.path.isdir, sys.path):
            directory_created = False
            directory = pathlib.Path(path) / '__pycache__'
            path = directory / 'test.try'
            try:
                if not directory.is_dir():
                    directory.mkdir()
                    directory_created = True
                with path.open('w') as file:
                    file.write('# for test_compileall')
            except OSError:
                sys_path_writable = False
                break
            finally:
                support.unlink(str(path))
                if directory_created:
                    directory.rmdir()
        else:
            sys_path_writable = True
        cls._sys_path_writable = sys_path_writable

    def _skip_if_sys_path_not_writable(self):
        if not self._sys_path_writable:
            raise unittest.SkipTest('not all entries on sys.path are writable')

    def _get_run_args(self, args):
        return [*support.optim_args_from_interpreter_flags(),
                '-S', '-m', 'compileall',
                *args]

    def assertRunOK(self, *args, **env_vars):
        rc, out, err = script_helper.assert_python_ok(
                         *self._get_run_args(args), **env_vars)
        self.assertEqual(b'', err)
        return out

    def assertRunNotOK(self, *args, **env_vars):
        rc, out, err = script_helper.assert_python_failure(
                        *self._get_run_args(args), **env_vars)
        return rc, out, err

    def assertCompiled(self, fn):
        path = importlib.util.cache_from_source(fn)
        self.assertTrue(os.path.exists(path))

    def assertNotCompiled(self, fn):
        path = importlib.util.cache_from_source(fn)
        self.assertFalse(os.path.exists(path))

    def setUp(self):
        self.directory = tempfile.mkdtemp()
        self.addCleanup(support.rmtree, self.directory)
        self.pkgdir = os.path.join(self.directory, 'foo')
        os.mkdir(self.pkgdir)
        self.pkgdir_cachedir = os.path.join(self.pkgdir, '__pycache__')
        # Create the __init__.py and a package module.
        self.initfn = script_helper.make_script(self.pkgdir, '__init__', '')
        self.barfn = script_helper.make_script(self.pkgdir, 'bar', '')

    def test_no_args_compiles_path(self):
        # Note that -l is implied for the no args case.
        self._skip_if_sys_path_not_writable()
        bazfn = script_helper.make_script(self.directory, 'baz', '')
        self.assertRunOK(PYTHONPATH=self.directory)
        self.assertCompiled(bazfn)
        self.assertNotCompiled(self.initfn)
        self.assertNotCompiled(self.barfn)

    def test_no_args_respects_force_flag(self):
        self._skip_if_sys_path_not_writable()
        bazfn = script_helper.make_script(self.directory, 'baz', '')
        self.assertRunOK(PYTHONPATH=self.directory)
        pycpath = importlib.util.cache_from_source(bazfn)
        # Set atime/mtime backward to avoid file timestamp resolution issues
        os.utime(pycpath, (time.time()-60,)*2)
        mtime = os.stat(pycpath).st_mtime
        # Without force, no recompilation
        self.assertRunOK(PYTHONPATH=self.directory)
        mtime2 = os.stat(pycpath).st_mtime
        self.assertEqual(mtime, mtime2)
        # Now force it.
        self.assertRunOK('-f', PYTHONPATH=self.directory)
        mtime2 = os.stat(pycpath).st_mtime
        self.assertNotEqual(mtime, mtime2)

    def test_no_args_respects_quiet_flag(self):
        self._skip_if_sys_path_not_writable()
        script_helper.make_script(self.directory, 'baz', '')
        noisy = self.assertRunOK(PYTHONPATH=self.directory)
        self.assertIn(b'Listing ', noisy)
        quiet = self.assertRunOK('-q', PYTHONPATH=self.directory)
        self.assertNotIn(b'Listing ', quiet)

    # Ensure that the default behavior of compileall's CLI is to create
    # PEP 3147/PEP 488 pyc files.
    for name, ext, switch in [
        ('normal', 'pyc', []),
        ('optimize', 'opt-1.pyc', ['-O']),
        ('doubleoptimize', 'opt-2.pyc', ['-OO']),
    ]:
        def f(self, ext=ext, switch=switch):
            script_helper.assert_python_ok(*(switch +
                ['-m', 'compileall', '-q', self.pkgdir]))
            # Verify the __pycache__ directory contents.
            self.assertTrue(os.path.exists(self.pkgdir_cachedir))
            expected = sorted(base.format(sys.implementation.cache_tag, ext)
                              for base in ('__init__.{}.{}', 'bar.{}.{}'))
            self.assertEqual(sorted(os.listdir(self.pkgdir_cachedir)), expected)
            # Make sure there are no .pyc files in the source directory.
            self.assertFalse([fn for fn in os.listdir(self.pkgdir)
                              if fn.endswith(ext)])
        locals()['test_pep3147_paths_' + name] = f

    def test_legacy_paths(self):
        # Ensure that with the proper switch, compileall leaves legacy
        # pyc files, and no __pycache__ directory.
        self.assertRunOK('-b', '-q', self.pkgdir)
        # Verify the __pycache__ directory contents.
        self.assertFalse(os.path.exists(self.pkgdir_cachedir))
        expected = sorted(['__init__.py', '__init__.pyc', 'bar.py',
                           'bar.pyc'])
        self.assertEqual(sorted(os.listdir(self.pkgdir)), expected)

    def test_multiple_runs(self):
        # Bug 8527 reported that multiple calls produced empty
        # __pycache__/__pycache__ directories.
        self.assertRunOK('-q', self.pkgdir)
        # Verify the __pycache__ directory contents.
        self.assertTrue(os.path.exists(self.pkgdir_cachedir))
        cachecachedir = os.path.join(self.pkgdir_cachedir, '__pycache__')
        self.assertFalse(os.path.exists(cachecachedir))
        # Call compileall again.
        self.assertRunOK('-q', self.pkgdir)
        self.assertTrue(os.path.exists(self.pkgdir_cachedir))
        self.assertFalse(os.path.exists(cachecachedir))

    def test_force(self):
        self.assertRunOK('-q', self.pkgdir)
        pycpath = importlib.util.cache_from_source(self.barfn)
        # set atime/mtime backward to avoid file timestamp resolution issues
        os.utime(pycpath, (time.time()-60,)*2)
        mtime = os.stat(pycpath).st_mtime
        # without force, no recompilation
        self.assertRunOK('-q', self.pkgdir)
        mtime2 = os.stat(pycpath).st_mtime
        self.assertEqual(mtime, mtime2)
        # now force it.
        self.assertRunOK('-q', '-f', self.pkgdir)
        mtime2 = os.stat(pycpath).st_mtime
        self.assertNotEqual(mtime, mtime2)

    def test_recursion_control(self):
        subpackage = os.path.join(self.pkgdir, 'spam')
        os.mkdir(subpackage)
        subinitfn = script_helper.make_script(subpackage, '__init__', '')
        hamfn = script_helper.make_script(subpackage, 'ham', '')
        self.assertRunOK('-q', '-l', self.pkgdir)
        self.assertNotCompiled(subinitfn)
        self.assertFalse(os.path.exists(os.path.join(subpackage, '__pycache__')))
        self.assertRunOK('-q', self.pkgdir)
        self.assertCompiled(subinitfn)
        self.assertCompiled(hamfn)

    def test_recursion_limit(self):
        subpackage = os.path.join(self.pkgdir, 'spam')
        subpackage2 = os.path.join(subpackage, 'ham')
        subpackage3 = os.path.join(subpackage2, 'eggs')
        for pkg in (subpackage, subpackage2, subpackage3):
            script_helper.make_pkg(pkg)

        subinitfn = os.path.join(subpackage, '__init__.py')
        hamfn = script_helper.make_script(subpackage, 'ham', '')
        spamfn = script_helper.make_script(subpackage2, 'spam', '')
        eggfn = script_helper.make_script(subpackage3, 'egg', '')

        self.assertRunOK('-q', '-r 0', self.pkgdir)
        self.assertNotCompiled(subinitfn)
        self.assertFalse(
            os.path.exists(os.path.join(subpackage, '__pycache__')))

        self.assertRunOK('-q', '-r 1', self.pkgdir)
        self.assertCompiled(subinitfn)
        self.assertCompiled(hamfn)
        self.assertNotCompiled(spamfn)

        self.assertRunOK('-q', '-r 2', self.pkgdir)
        self.assertCompiled(subinitfn)
        self.assertCompiled(hamfn)
        self.assertCompiled(spamfn)
        self.assertNotCompiled(eggfn)

        self.assertRunOK('-q', '-r 5', self.pkgdir)
        self.assertCompiled(subinitfn)
        self.assertCompiled(hamfn)
        self.assertCompiled(spamfn)
        self.assertCompiled(eggfn)

    def test_quiet(self):
        noisy = self.assertRunOK(self.pkgdir)
        quiet = self.assertRunOK('-q', self.pkgdir)
        self.assertNotEqual(b'', noisy)
        self.assertEqual(b'', quiet)

    def test_silent(self):
        script_helper.make_script(self.pkgdir, 'crunchyfrog', 'bad(syntax')
        _, quiet, _ = self.assertRunNotOK('-q', self.pkgdir)
        _, silent, _ = self.assertRunNotOK('-qq', self.pkgdir)
        self.assertNotEqual(b'', quiet)
        self.assertEqual(b'', silent)

    def test_regexp(self):
        self.assertRunOK('-q', '-x', r'ba[^\\/]*$', self.pkgdir)
        self.assertNotCompiled(self.barfn)
        self.assertCompiled(self.initfn)

    def test_multiple_dirs(self):
        pkgdir2 = os.path.join(self.directory, 'foo2')
        os.mkdir(pkgdir2)
        init2fn = script_helper.make_script(pkgdir2, '__init__', '')
        bar2fn = script_helper.make_script(pkgdir2, 'bar2', '')
        self.assertRunOK('-q', self.pkgdir, pkgdir2)
        self.assertCompiled(self.initfn)
        self.assertCompiled(self.barfn)
        self.assertCompiled(init2fn)
        self.assertCompiled(bar2fn)

    def test_d_compile_error(self):
        script_helper.make_script(self.pkgdir, 'crunchyfrog', 'bad(syntax')
        rc, out, err = self.assertRunNotOK('-q', '-d', 'dinsdale', self.pkgdir)
        self.assertRegex(out, b'File "dinsdale')

    def test_d_runtime_error(self):
        bazfn = script_helper.make_script(self.pkgdir, 'baz', 'raise Exception')
        self.assertRunOK('-q', '-d', 'dinsdale', self.pkgdir)
        fn = script_helper.make_script(self.pkgdir, 'bing', 'import baz')
        pyc = importlib.util.cache_from_source(bazfn)
        os.rename(pyc, os.path.join(self.pkgdir, 'baz.pyc'))
        os.remove(bazfn)
        rc, out, err = script_helper.assert_python_failure(fn, __isolated=False)
        self.assertRegex(err, b'File "dinsdale')

    def test_include_bad_file(self):
        rc, out, err = self.assertRunNotOK(
            '-i', os.path.join(self.directory, 'nosuchfile'), self.pkgdir)
        self.assertRegex(out, b'rror.*nosuchfile')
        self.assertNotRegex(err, b'Traceback')
        self.assertFalse(os.path.exists(importlib.util.cache_from_source(
                                            self.pkgdir_cachedir)))

    def test_include_file_with_arg(self):
        f1 = script_helper.make_script(self.pkgdir, 'f1', '')
        f2 = script_helper.make_script(self.pkgdir, 'f2', '')
        f3 = script_helper.make_script(self.pkgdir, 'f3', '')
        f4 = script_helper.make_script(self.pkgdir, 'f4', '')
        with open(os.path.join(self.directory, 'l1'), 'w') as l1:
            l1.write(os.path.join(self.pkgdir, 'f1.py')+os.linesep)
            l1.write(os.path.join(self.pkgdir, 'f2.py')+os.linesep)
        self.assertRunOK('-i', os.path.join(self.directory, 'l1'), f4)
        self.assertCompiled(f1)
        self.assertCompiled(f2)
        self.assertNotCompiled(f3)
        self.assertCompiled(f4)

    def test_include_file_no_arg(self):
        f1 = script_helper.make_script(self.pkgdir, 'f1', '')
        f2 = script_helper.make_script(self.pkgdir, 'f2', '')
        f3 = script_helper.make_script(self.pkgdir, 'f3', '')
        f4 = script_helper.make_script(self.pkgdir, 'f4', '')
        with open(os.path.join(self.directory, 'l1'), 'w') as l1:
            l1.write(os.path.join(self.pkgdir, 'f2.py')+os.linesep)
        self.assertRunOK('-i', os.path.join(self.directory, 'l1'))
        self.assertNotCompiled(f1)
        self.assertCompiled(f2)
        self.assertNotCompiled(f3)
        self.assertNotCompiled(f4)

    def test_include_on_stdin(self):
        f1 = script_helper.make_script(self.pkgdir, 'f1', '')
        f2 = script_helper.make_script(self.pkgdir, 'f2', '')
        f3 = script_helper.make_script(self.pkgdir, 'f3', '')
        f4 = script_helper.make_script(self.pkgdir, 'f4', '')
        p = script_helper.spawn_python(*(self._get_run_args(()) + ['-i', '-']))
        p.stdin.write((f3+os.linesep).encode('ascii'))
        script_helper.kill_python(p)
        self.assertNotCompiled(f1)
        self.assertNotCompiled(f2)
        self.assertCompiled(f3)
        self.assertNotCompiled(f4)

    def test_compiles_as_much_as_possible(self):
        bingfn = script_helper.make_script(self.pkgdir, 'bing', 'syntax(error')
        rc, out, err = self.assertRunNotOK('nosuchfile', self.initfn,
                                           bingfn, self.barfn)
        self.assertRegex(out, b'rror')
        self.assertNotCompiled(bingfn)
        self.assertCompiled(self.initfn)
        self.assertCompiled(self.barfn)

    def test_invalid_arg_produces_message(self):
        out = self.assertRunOK('badfilename')
        self.assertRegex(out, b"Can't list 'badfilename'")

    @skipUnless(_have_multiprocessing, "requires multiprocessing")
    def test_workers(self):
        bar2fn = script_helper.make_script(self.directory, 'bar2', '')
        files = []
        for suffix in range(5):
            pkgdir = os.path.join(self.directory, 'foo{}'.format(suffix))
            os.mkdir(pkgdir)
            fn = script_helper.make_script(pkgdir, '__init__', '')
            files.append(script_helper.make_script(pkgdir, 'bar2', ''))

        self.assertRunOK(self.directory, '-j', '0')
        self.assertCompiled(bar2fn)
        for file in files:
            self.assertCompiled(file)

    @mock.patch('compileall.compile_dir')
    def test_workers_available_cores(self, compile_dir):
        with mock.patch("sys.argv",
                        new=[sys.executable, self.directory, "-j0"]):
            compileall.main()
            self.assertTrue(compile_dir.called)
            self.assertEqual(compile_dir.call_args[-1]['workers'], None)


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