[skip ci] Add comments for test case (#7867)

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

tests/python_client/testcases/entity/test_insert.py

@@ -1185,6 +1185,11 @@ class TestInsertInvalidBinary(object):
 
     @pytest.mark.tags(CaseLabel.L2)
     def test_insert_with_invalid_field_entities_value(self, connect, binary_collection, get_field_vectors_value):
+        """
+        target: test insert with invalid field
+        method: insert with invalid field value
+        expected: raise exception
+        """
         tmp_entities = copy.deepcopy(default_binary_entities)
         src_vector = tmp_entities[-1]["values"]
         src_vector[1] = get_field_vectors_value