Add invalid_launch_file_error test

Signed-off-by: David Yackzan <dwyackzan@gmail.com>

launch/test/launch/test_invalid_launch_file_error.py

@@ -0,0 +1,23 @@
+# Copyright 2023 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from launch.invalid_launch_file_error import InvalidLaunchFileError
+
+
+def test_invalid_launch_file_error():
+    try:
+        exception = KeyError("Test")
+        raise InvalidLaunchFileError(extension=".py", likely_errors=exception)
+    except Exception as ex:
+        assert "KeyError" in ex.__str__()