Remove one more use of a custom helper

Author: adamtheturtle

tests/mock_vws/test_add_target.py

@@ -984,31 +984,25 @@ def test_not_base64_encoded_processable(
 
     @staticmethod
     def test_not_base64_encoded_not_processable(
-        vuforia_database: VuforiaDatabase,
         high_quality_image: io.BytesIO,
         not_base64_encoded_not_processable: str,
+        vws_client: VWS,
     ) -> None:
         """
         Some strings which are not valid base64 encoded strings are not allowed
         as application metadata.
         """
-        image_content = high_quality_image.getvalue()
-        image_data_encoded = base64.b64encode(s=image_content).decode("ascii")
-
-        data = {
-            "name": "example_name",
-            "width": 1,
-            "image": image_data_encoded,
-            "application_metadata": not_base64_encoded_not_processable,
-        }
-
-        response = _add_target_to_vws(
-            vuforia_database=vuforia_database,
-            data=data,
-        )
+        with pytest.raises(expected_exception=Fail) as exc:
+            vws_client.add_target(
+                name="example",
+                width=1,
+                image=high_quality_image,
+                application_metadata=not_base64_encoded_not_processable,
+                active_flag=True,
+            )
 
         assert_vws_failure(
-            response=response,
+            response=exc.value.response,
             status_code=HTTPStatus.UNPROCESSABLE_ENTITY,
             result_code=ResultCodes.FAIL,
         )