Test modules are imported twice if they import each other

[orenbenkiki]

If one test module imports another, then nosetests will import the same module twice; once as the proper tests.full.path.name and once as just name.

To replicate, mkdir tests, then write the following into tests/a.py:

import sys
import traceback

sys.stderr.write("A %s executing as %s, recognized as %s in sys.modules\n\n\n" % (__file__, __name__, sys.modules[__name__]))
traceback.print_stack()
sys.stderr.write("\n\n\n")

class TestCases:

    def test_a(self):
        sys.stderr.write("TEST A\n")

And the following into tests/b.py:

import sys

sys.stderr.write("B %s executing as %s, recognized as %s in sys.modules\n" % (__file__, __name__, sys.modules[__name__]))

import tests.a

class TestCases:

    def test_a(self):
        sys.stderr.write("TEST B\n")

Then running nosetests tests/a.py tests/b.py gives the output:

A /big_share2/pacific/user/obenkiki/npl/todox/tests/a.py executing as a, recognized as <module 'a' from '/big_share2/pacific/user/obenkiki/npl/todox/tests/a.py'> in sys.modules

  File "/common/pkgs/python/3.6.0/bin/nosetests", line 11, in <module>
    sys.exit(run_exit())
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 121, in __init__
    **extra_args)
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/main.py", line 93, in __init__
    self.parseArgs(argv)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 179, in parseArgs
    self.createTests()
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 193, in createTests
    self.test = self.testLoader.loadTestsFromNames(self.testNames)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/loader.py", line 481, in loadTestsFromNames
    return unittest.TestLoader.loadTestsFromNames(self, names, module)
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/loader.py", line 219, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/loader.py", line 219, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/common/pkgs/python/3.6.0/lib/python3.6/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/common/pkgs/python/3.6.0/lib/python3.6/imp.py", line 172, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 675, in _load
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/big_share2/pacific/user/obenkiki/npl/todox/tests/a.py", line 5, in <module>
    traceback.print_stack()

B /big_share2/pacific/user/obenkiki/npl/todox/tests/b.py executing as b, recognized as <module 'b' from '/big_share2/pacific/user/obenkiki/npl/todox/tests/b.py'> in sys.modules

A /big_share2/pacific/user/obenkiki/npl/todox/tests/a.py executing as tests.a, recognized as <module 'tests.a' from '/big_share2/pacific/user/obenkiki/npl/todox/tests/a.py'> in sys.modules

  File "/common/pkgs/python/3.6.0/bin/nosetests", line 11, in <module>
    sys.exit(run_exit())
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 121, in __init__
    **extra_args)
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/main.py", line 93, in __init__
    self.parseArgs(argv)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 179, in parseArgs
    self.createTests()
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/core.py", line 193, in createTests
    self.test = self.testLoader.loadTestsFromNames(self.testNames)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/loader.py", line 481, in loadTestsFromNames
    return unittest.TestLoader.loadTestsFromNames(self, names, module)
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/loader.py", line 219, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/common/pkgs/python/3.6.0/lib/python3.6/unittest/loader.py", line 219, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/common/pkgs/python/3.6.0/lib/python3.6/site-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/common/pkgs/python/3.6.0/lib/python3.6/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/common/pkgs/python/3.6.0/lib/python3.6/imp.py", line 172, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 675, in _load
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/big_share2/pacific/user/obenkiki/npl/todox/tests/b.py", line 5, in <module>
    import tests.a
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/big_share2/pacific/user/obenkiki/npl/todox/tests/a.py", line 5, in <module>
    traceback.print_stack()

TEST A
.TEST B
.
----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK

Note that the a module is imported twice, which isn't what I expected. Is there a workaround?

My nosetests --version says 1.3.7, if that matters.

Thanks,

Oren.