diff --git a/tests/test_cli.py b/tests/test_cli.py
index 217da74dd472459376a93afa866ac21e5d398bfa..14e4d3bc70d612e149ac35aa8d585a2f665cf0a8 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -48,3 +48,37 @@ def test_main_invokes_argument_parsing(mock_get_parser):
     gimmecert.cli.main()
 
     mock_parser.parse_args.assert_called_once_with()
+
+
+def test_cli_parser_has_description():
+    parser = gimmecert.cli.get_parser()
+
+    assert parser.description
+
+
+def test_parser_sets_up_default_callback_function():
+    parser = gimmecert.cli.get_parser()
+
+    assert callable(parser.get_default('func'))
+
+
+@mock.patch('gimmecert.cli.argparse.ArgumentParser.print_usage')
+def test_parser_default_callback_function_calls_print_usage(mock_print_usage):
+    parser = gimmecert.cli.get_parser()
+    func = parser.get_default('func')
+    func(mock.Mock())
+
+    assert mock_print_usage.called
+
+
+@mock.patch('gimmecert.cli.get_parser')
+def test_main_invokes_parser_function(mock_get_parser):
+    mock_parser = mock.Mock()
+    mock_args = mock.Mock()
+
+    mock_parser.parse_args.return_value = mock_args
+    mock_get_parser.return_value = mock_parser
+
+    gimmecert.cli.main()
+
+    mock_args.func.assert_called_once_with(mock_args)