add note to help message that stdout might not be shown by default (#328)

* add note to help message that stdout might not be shown by default

* update help message based on feedback

* same update help message in different file

Author: dirk-thomas

colcon_core/task/python/test/pytest.py

@@ -39,7 +39,8 @@ def add_arguments(self, *, parser):  # noqa: D102
             nargs='*', metavar='*', type=str.lstrip,
             help='Pass arguments to pytests. '
             'Arguments matching other options must be prefixed by a space,\n'
-            'e.g. --pytest-args " --help"')
+            'e.g. --pytest-args " --help" (stdout might not be shown by '
+            'default, e.g. add `--event-handlers console_cohesion+`)')
         parser.add_argument(
             '--pytest-with-coverage',
             action='store_true',

colcon_core/task/python/test/setuppy_test.py

@@ -23,7 +23,8 @@ def add_arguments(self, *, parser):  # noqa: D102
             nargs='*', metavar='*', type=str.lstrip,
             help='Pass arguments to Python unittests. '
             'Arguments matching other options must be prefixed by a space,\n'
-            'e.g. --unittest-args " --help"')
+            'e.g. --unittest-args " --help" (stdout might not be shown by '
+            'default, e.g. add `--event-handlers console_cohesion+`)')
 
     def match(self, context, env, setup_py_data):  # noqa: D102
         return True