Slight update to graph api tests

src/service/clmcservice/graphapi/tests.py

@@ -60,7 +60,7 @@ class TestGraphAPI(object):
         ('{"service_function_chain": "sfc", "service_function_chain_instance": "sfc_1", "service_functions": {"invalid_json"}}',
          "Configuration must be a JSON object.", "A bad request error must have been raised in case of invalid JSON body."),
         ('{"from": 1528386860, "to":1528389860, "service_function_chain": "sfc", "service_function_chain_instance": "sfc_1", "service_functions": ["nginx", "minio"]}',
-         "The service function description should be represented with a dictionary.", "A bad request error must have been raised in case of invalid request body."),
+         "The service functions description should be represented with a JSON object.", "A bad request error must have been raised in case of invalid request body."),
         ('{"from": 1528386860, "to":1528389860, "service_function_chain_instance": "sfc_1", "service_functions": {"nginx": {"measurement_name": "nginx", "response_time_field": "mean(avg_processing_time)", "request_size_field": "mean(avg_request_size)", "response_size_field": "mean(avg_response_size"}}}',
          "Invalid JSON query document.", "A bad request error must have been raised in case of missing service function chain value in the request body"),
         ('{"from": 1528386860, "to":1628389860, "service_function_chain": "sfc", "service_functions": {"nginx": {"measurement_name": "nginx", "response_time_field": "mean(avg_processing_time)", "request_size_field": "mean(avg_request_size)", "response_size_field": "mean(avg_response_size"}}}',
@@ -469,7 +469,7 @@ class TestGraphAPI(object):
         ('{"service_function_chain": "sfc", "service_function_chain_instance": "sfc_1", "service_functions": {"invalid_json"}}',
          "Configuration must be a JSON object.", "A bad request error must have been raised in case of invalid JSON body."),
         ('{"query_period": 45, "results_measurement_name": "graph", "service_function_chain": "sfc", "service_function_chain_instance": "sfc_1", "service_functions": ["nginx", "minio"]}',
-         "The service function description should be represented with a dictionary.", "A bad request error must have been raised in case of invalid request body."),
+         "The service functions description should be represented with a JSON object.", "A bad request error must have been raised in case of invalid request body."),
         ('{"query_period": 45, "results_measurement_name": "graph", "service_function_chain_instance": "sfc_1", "service_functions": {"nginx": {"measurement_name": "nginx", "response_time_field": "mean(avg_processing_time)", "request_size_field": "mean(avg_request_size)", "response_size_field": "mean(avg_response_size"}}}',
          "Invalid JSON query document.", "A bad request error must have been raised in case of missing service function chain value in the request body"),
         ('{"query_period": 45, "results_measurement_name": "graph", "service_function_chain": "sfc", "service_functions": {"nginx": {"measurement_name": "nginx", "response_time_field": "mean(avg_processing_time)", "request_size_field": "mean(avg_request_size)", "response_size_field": "mean(avg_response_size"}}}',