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How to use test_command_missing_substitution_complex method in tox

Best Python code snippet using tox_python

test_config.py

Source:test_config.py

...519            envconfig.commands520        expected = "MissingSubstitution: FOO"521        with pytest.raises(tox.exception.MissingSubstitution, match=expected):522            envconfig.setenv["FOO"]523    def test_command_missing_substitution_complex(self, newconfig):524        config = newconfig(525            """526            [testenv:base]527            bar = {env:BAR}528            setenv =529                BAR = {[testenv:py27]foo}530            [testenv:py27]531            foo = {env:FOO}532            setenv =533                FOO = {[testenv:base]bar}534            commands = {env:FOO}535            """,536        )537        envconfig = config.envconfigs["py27"]...

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