test(cli): add tests for the CLI

tests/unit/cli/test_python.py

@@ -0,0 +1,64 @@
+# 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 pathlib
+import pytest
+from jcloud_docsgen.cli.cli import create_argument_parser, main as cli_main
+
+def test_sections_error():
+    parser = create_argument_parser()
+
+    with pytest.raises(SystemExit):
+        parser.parse_args([
+            'python',
+            '-s',
+            'param' # correct: `params`
+        ])
+
+    with pytest.raises(SystemExit):
+        parser.parse_args([
+            'python',
+            '-s',
+            'params',
+            'docstrng' # correct: `docstring`
+        ])
+
+def test_sections_success():
+    parser = create_argument_parser()
+
+    parser.parse_args([
+        'python',
+        '-s',
+        'params'
+    ])
+    parser.parse_args([
+        'python',
+        '-s',
+        'params',
+        'docstring'
+    ])
+
+def test_docs_generation(expectdir):
+    with expectdir('python_project') as output_dir:
+        output_dir: pathlib.Path
+        input_dir = pathlib.Path(__file__).parent / 'python_project/project'
+        cli_main([
+            'python',
+            '-s',
+            'params',
+            'docstring',
+            '-HTo',
+            str(output_dir),
+            str(input_dir)
+        ])