Fix running test_source_cli with unusual COLUMNS values

Tests expect help text to be wrapped at 80 characters.

Issue: #463

Author: CyberTailor

tests/conftest.py

@@ -82,3 +82,15 @@ def docs_test_env():
     yield setenv
 
     setenv.clear()
+
+
+@pytest.fixture
+def cli_test_env():
+    setenv = SetEnv()
+
+    # envs for reproducible cli tests
+    setenv.set('COLUMNS', '80')
+
+    yield setenv
+
+    setenv.clear()

tests/test_source_cli.py

@@ -44,6 +44,11 @@
 ARGPARSE_OPTIONS_TEXT = 'options' if sys.version_info >= (3, 10) else 'optional arguments'
 
 
+@pytest.fixture(autouse=True)
+def cli_test_env_autouse(cli_test_env):
+    pass
+
+
 def foobar(a, b, c=4):
     pass