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How to use test_normal_env_sub_works method in tox

Best Python code snippet using tox_python

test_config.py

...510        assert x["key1"] == "item1"511        assert x["key2"] == "grr"512        x = reader.getdict("key3", {1: 2})513        assert x == {1: 2}514    def test_normal_env_sub_works(self, monkeypatch, newconfig):515        monkeypatch.setenv("VAR", "hello")516        config = newconfig("[section]\nkey={env:VAR}")517        assert SectionReader("section", config._cfg).getstring("key") == "hello"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(...

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