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How to use test_install_command_substitutions method in tox

Best Python code snippet using tox_python

test_config.py

Source:test_config.py

...508        py.test.raises(tox.exception.ConfigError, newconfig, """509            [testenv]510            install_command=pip install511        """)512    def test_install_command_substitutions(self, newconfig):513        config = newconfig("""514            [testenv]515            install_command=some_install --arg={toxinidir}/foo \516                {envname} {opts} {packages}517        """)518        envconfig = config.envconfigs['python']519        assert envconfig.install_command == [520            'some_install', '--arg=%s/foo' % config.toxinidir, 'python',521            '{opts}', '{packages}']522    def test_downloadcache(self, newconfig, monkeypatch):523        monkeypatch.delenv("PIP_DOWNLOAD_CACHE", raising=False)524        config = newconfig("""525            [testenv]526            downloadcache=thecache...

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