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How to use test_missing_env_fails method in tox

Best Python code snippet using tox_python

test_z_cmdline.py

Source:test_z_cmdline.py

...941    result = cmd()942    result.assert_success()943    result = cmd()944    result.assert_success()945def test_missing_env_fails(initproj, cmd):946    initproj("foo", filedefs={"tox.ini": "[testenv:foo]\ncommands={env:VAR}"})947    result = cmd()948    result.assert_fail()949    assert result.out.endswith(950        "foo: unresolvable substitution(s): 'VAR'."951        " Environment variables are missing or defined recursively.\n",952    )953def test_tox_console_script(initproj):954    initproj("help", filedefs={"tox.ini": ""})955    result = subprocess.check_call(["tox", "--help"])956    assert result == 0957def test_tox_quickstart_script(initproj):958    initproj("help", filedefs={"tox.ini": ""})959    result = subprocess.check_call(["tox-quickstart", "--help"])...

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