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How to use test_missing_env_sub_populates_missing_subs method in tox

Best Python code snippet using tox_python

test_config.py

Source:test_config.py

...518    def test_missing_env_sub_raises_config_error_in_non_testenv(self, newconfig):519        config = newconfig("[section]\nkey={env:VAR}")520        with pytest.raises(tox.exception.ConfigError):521            SectionReader("section", config._cfg).getstring("key")522    def test_missing_env_sub_populates_missing_subs(self, newconfig):523        config = newconfig("[testenv:foo]\ncommands={env:VAR}")524        print(SectionReader("section", config._cfg).getstring("commands"))525        assert config.envconfigs["foo"]._missing_subs == ["VAR"]526    def test_getstring_environment_substitution_with_default(self, monkeypatch, newconfig):527        monkeypatch.setenv("KEY1", "hello")528        config = newconfig(529            """530            [section]531            key1={env:KEY1:DEFAULT_VALUE}532            key2={env:KEY2:DEFAULT_VALUE}533            key3={env:KEY3:}534        """,535        )536        reader = SectionReader("section", config._cfg)...

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