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How to use test_command_missing_substitution method in tox

Best Python code snippet using tox_python

test_config.py

Source:test_config.py

...627        )628        reader = SectionReader("testenv", config._cfg)629        x = reader.getargvlist("commands")630        assert x[0] == ["pytest", "default", "with", ":", "colon", "after"]631    def test_command_missing_substitution(self, newconfig):632        config = newconfig(633            """634            [testenv:a]635            setenv =636              FOO = foo637            commands = {env:FOO}638            """,639        )640        reader = SectionReader("testenv:a", config._cfg)641        expected = "MissingSubstitution: FOO"642        with pytest.raises(tox.exception.MissingSubstitution, match=expected):643            reader.getargvlist("commands")644    def test_command_env_substitution(self, newconfig):645        """Ensure referenced {env:key:default} values are substituted correctly."""...

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