How to use test_install_command_not_installed method in tox

Best Python code snippet using tox_python

test_venv.py

Source:test_venv.py

...244    venv = mocksession.getenv('python')245    venv.test()246    mocksession.report.expect("error", "*not find*qwelkqw*")247    assert venv.status == "commands failed"248def test_install_command_not_installed(newmocksession, monkeypatch):249    mocksession = newmocksession(['--recreate'], """250        [testenv]251        commands=252            py.test253    """)254    venv = mocksession.getenv('python')255    venv.test()256    mocksession.report.expect("warning", "*test command found but not*")257    assert venv.status == "commands failed"258def test_install_command_whitelisted(newmocksession, monkeypatch):259    mocksession = newmocksession(['--recreate'], """260        [testenv]261        whitelist_externals = py.test262                              xy*263        commands=264            py.test265            xyz266    """)267    venv = mocksession.getenv('python')268    venv.test()269    mocksession.report.expect("warning", "*test command found but not*",270                              invert=True)271    assert venv.status == "commands failed"272@pytest.mark.skipif("not sys.platform.startswith('linux')")273def test_install_command_not_installed(newmocksession):274    mocksession = newmocksession(['--recreate'], """275        [testenv]276        commands=277            bash278    """)279    venv = mocksession.getenv('python')280    venv.test()281    mocksession.report.expect("warning", "*test command found but not*")282def test_install_python3(tmpdir, newmocksession):283    if not py.path.local.sysfind('python3.3'):284        pytest.skip("needs python3.3")285    mocksession = newmocksession([], """286        [testenv:py123]287        basepython=python3.3...

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