fake_subTest() missing 1 required positional argument: 'self'

[jimmy-lt]

Hypotesis is failing when running a unittest with a subTest().

Traceback (most recent call last):
  File "/tests/common/test_components.py", line 91, in test__located_component_multiple_components_registration
    c1_name=registry_identifier_strategy(),
  File "/lib/python3.8/site-packages/hypothesis/core.py", line 1102, in wrapped_test
    raise the_error_hypothesis_found
  File "/tests/common/test_components.py", line 150, in test__located_component_multiple_components_registration
    with self.subTest(action='count'):
  File "/usr/lib/python3.8/contextlib.py", line 240, in helper
    return _GeneratorContextManager(func, args, kwds)
  File "/usr/lib/python3.8/contextlib.py", line 83, in __init__
    self.gen = func(*args, **kwds)
TypeError: fake_subTest() missing 1 required positional argument: 'self'

Version information

• Python 3.8.3
• hypothesis 5.16.1

[Zac-HD]

Please share a complete example that I can run to reproduce this problem.

[jimmy-lt]

With subTest()

import unittest
from hypothesis import given, strategies as st


class MyTest(unittest.TestCase):
    @given(s=st.text())
    def test_subtest(self, s):
        with self.subTest(text=s):
            self.assertIs(type(s), str)

$ python3 -m unittest tests.MyTest
Falsifying example: test_subtest(
    self=<tests.MyTest testMethod=test_subtest>, s='',
)
E
======================================================================
ERROR: test_subtest (tests.MyTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tests.py", line 7, in test_subtest
    def test_subtest(self, s):
  File "/usr/lib/python3.8/site-packages/hypothesis/core.py", line 1102, in wrapped_test
    raise the_error_hypothesis_found
  File "/tests.py", line 8, in test_subtest
    with self.subTest(text=s):
  File "/usr/lib/python3.8/contextlib.py", line 240, in helper
    return _GeneratorContextManager(func, args, kwds)
  File "/usr/lib/python3.8/contextlib.py", line 83, in __init__
    self.gen = func(*args, **kwds)
TypeError: fake_subTest() missing 1 required positional argument: 'self'

----------------------------------------------------------------------
Ran 1 test in 0.209s

FAILED (errors=1)

Without subTest()

import unittest
from hypothesis import given, strategies as st


class MyTest(unittest.TestCase):
    @given(s=st.text())
    def test_subtest(self, s):
        self.assertIs(type(s), str)

$ python3 -m unittest -v tests.MyTest
test_subtest (tests.MyTest) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.102s

OK