diff --git a/tests/apimatic_core/utility_tests/test_api_helper.py b/tests/apimatic_core/utility_tests/test_api_helper.py
index 1886139..2ea7559 100644
--- a/tests/apimatic_core/utility_tests/test_api_helper.py
+++ b/tests/apimatic_core/utility_tests/test_api_helper.py
@@ -826,7 +826,11 @@ def test_date_time_response_body(self, input_http_response, input_date_time_form
         ('I am not a file', False)
     ])
     def test_is_file_wrapper_instance(self, input_file_wrapper, is_file_instance):
-        assert ApiHelper.is_file_wrapper_instance(input_file_wrapper) == is_file_instance
+        try:
+            assert ApiHelper.is_file_wrapper_instance(input_file_wrapper) == is_file_instance
+        finally:
+            if is_file_instance:
+                input_file_wrapper.file_stream.close()
 
     @pytest.mark.parametrize(' input_date, output_date', [
         (datetime(1994, 2, 13, 5, 30, 15), Base.get_http_datetime(datetime(1994, 2, 13, 5, 30, 15))),