[skip ci] Add test comments (#8952)

Signed-off-by: NBinbin Lv <binbin.lv@zilliz.com>

tests/python_client/testcases/test_collection.py

@@ -2398,6 +2398,11 @@ class TestDropCollectionInvalid(object):
 
     @pytest.mark.tags(CaseLabel.L2)
     def test_drop_collection_with_invalid_collection_name(self, connect, get_collection_name):
+        """
+        target: test drop invalid collection
+        method: drop collection with invalid collection name
+        expected: raise exception
+        """
         collection_name = get_collection_name
         with pytest.raises(Exception) as e:
             connect.has_collection(collection_name)