test(cli): add tests for the CLI

tests/unit/cli/test_parser.py

@@ -0,0 +1,34 @@
+# Copyright 2026 jCloud
+
+# 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.
+
+import pytest
+from jcloud_docsgen.cli.cli import create_argument_parser
+
+@pytest.mark.parametrize('lang', [
+    'javascript',
+    'Python',
+    'PYTHON'
+])
+def test_language_error(lang):
+    parser = create_argument_parser()
+
+    with pytest.raises(SystemExit):
+        parser.parse_args([lang])
+
+@pytest.mark.parametrize('lang', [
+    'python'
+])
+def test_language_success(lang):
+    parser = create_argument_parser()
+    parser.parse_args([lang])