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How to use test_command_missing_substitution_simple method in tox

Best Python code snippet using tox_python

test_config.py

Source:test_config.py

...442                    FOO = foo443                commands = {env:FOO:{[testenv:base]foo}}444                """,445            )446    def test_command_missing_substitution_simple(self, newconfig):447        config = newconfig(448            """449            [testenv:py27]450            commands = {env:{env:FOO}}451            """,452        )453        envconfig = config.envconfigs["py27"]454        expected = "MissingSubstitution: FOO"455        with pytest.raises(tox.exception.MissingSubstitution, match=expected):456            envconfig.commands457    def test_command_missing_substitution_setenv(self, newconfig):458        config = newconfig(459            """460            [testenv:py27]...

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