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kivy/tests/test_environ_cli.py

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+# coding=utf-8
+
+from os import environ
+import shlex
+import subprocess
+import sys
+
+import pytest
+
+ENV_NAME = "KIVY_NO_ARGS"
+KIVY_ENVS_TO_EXCLUDE = ("KIVY_UNITTEST", "KIVY_PACKAGING")
+
+EXPECTED_STR = "Kivy Usage"
+
+TRUTHY = {"true", "1", "yes"}
+FALSY = {"false", "0", "no", "anything-else"}
+
+SAMPLE_VALUES = {*TRUTHY, *FALSY}
+
+
+def _patch_env(*filtered_keys, **kw):
+    env = {k: v for k, v in environ.items() if k not in filtered_keys}
+    env.update(kw)
+    return env
+
+
+def _kivy_subproces_import(env):
+    return subprocess.run(
+        [sys.executable, "-c", "import kivy", "--help"],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        env=env,
+    ).stdout.decode("utf8")
+
+
+@pytest.mark.parametrize("value", SAMPLE_VALUES)
+def test_env_exist(value):
+    env = _patch_env(*KIVY_ENVS_TO_EXCLUDE, **{ENV_NAME: value})
+    stdout = _kivy_subproces_import(env)
+
+    if value in TRUTHY:
+        assert EXPECTED_STR not in stdout
+    else:
+        assert EXPECTED_STR in stdout
+
+
+def test_env_not_exist():
+    env = _patch_env(ENV_NAME, *KIVY_ENVS_TO_EXCLUDE)
+    stdout = _kivy_subproces_import(env)
+    assert EXPECTED_STR in stdout