=================================== FAILURES ===================================
___________________ test_output_env_subprocess_error[color] ____________________

mocker = <pytest_mock.plugin.MockerFixture object at 0x7f76f42d7f10>
monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x7f76f42bf5d0>
main_reload_styles = None
package_test_invalid_requirements = '/builddir/build/BUILD/build-0.10.0/tests/packages/test-invalid-requirements'
tmp_dir = '/tmp/python-build-test-0cztn5fn'
capsys = <_pytest.capture.CaptureFixture object at 0x7f76f43265d0>, color = True
stdout_body = ['\x1b[1m* Creating venv isolated environment...\x1b[0m', '\x1b[1m* Installing packages in isolated environment... (setuptools >= 42.0.0, this is invalid, wheel >= 0.36.0)\x1b[0m', '', '\x1b[2mTraceback (most recent call last):']
stdout_error = '\x1b[91mERROR\x1b[0m '

    @pytest.mark.pypy3323bug
    @pytest.mark.parametrize(
        ('color', 'stdout_error', 'stdout_body'),
        [
            (
                False,
                'ERROR ',
                [
                    '* Creating venv isolated environment...',
                    '* Installing packages in isolated environment... (setuptools >= 42.0.0, this is invalid, wheel >= 0.36.0)',
                    '',
                    'Traceback (most recent call last):',
                ],
            ),
            (
                True,
                '\33[91mERROR\33[0m ',
                [
                    '\33[1m* Creating venv isolated environment...\33[0m',
                    '\33[1m* Installing packages in isolated environment... '
                    '(setuptools >= 42.0.0, this is invalid, wheel >= 0.36.0)\33[0m',
                    '',
                    '\33[2mTraceback (most recent call last):',
                ],
            ),
        ],
        ids=['no-color', 'color'],
    )
    def test_output_env_subprocess_error(
        mocker,
        monkeypatch,
        main_reload_styles,
        package_test_invalid_requirements,
        tmp_dir,
        capsys,
        color,
        stdout_body,
        stdout_error,
    ):
        try:
            # do not inject hook to have clear output on capsys
            mocker.patch('colorama.init')
        except ModuleNotFoundError:  # colorama might not be available
            pass
    
        monkeypatch.delenv('NO_COLOR', raising=False)
        monkeypatch.setenv('FORCE_COLOR' if color else 'NO_COLOR', '')
    
        importlib.reload(build.__main__)  # reload module to set _STYLES
    
        with pytest.raises(SystemExit):
            build.__main__.main([package_test_invalid_requirements, '-o', tmp_dir])
        stdout, stderr = capsys.readouterr()
        stdout, stderr = stdout.splitlines(), stderr.splitlines()
    
        assert stdout[:4] == stdout_body
        assert stdout[-1].startswith(stdout_error)
    
>       assert len(stderr) == 1
E       assert 2 == 1
E        +  where 2 = len(["\x1b[31mERROR: Invalid requirement: 'this is invalid' (from line 1 of /tmp/build-reqs-ae11gsg7.txt)\x1b[0m\x1b[31m", '\x1b[0m'])

tests/test_main.py:371: AssertionError
=========================== short test summary info ============================
FAILED tests/test_main.py::test_output_env_subprocess_error[color] - assert 2...
===== 1 failed, 113 passed, 34 skipped, 12 deselected in 66.53s (0:01:06) ======