fix message

Author: anthony-nhs

features/eps_fhir/validator.feature

@@ -20,4 +20,4 @@ Feature: I can call the validator endpoint
     When I make a invalid request to the eps_fhir validator endpoint with show validation set to false
     Then the response indicates a bad request
     And the validator response has many error issue
-    And the validator response has error with diagnostic Failed to parse JSON encoded FHIR content: Content does not appear to be FHIR JSON, first non-whitespace character was: '\"' (must be '{')"}]}
+    And the validator response has error with diagnostic containing "Failed to parse JSON encoded FHIR content"

features/eps_fhir_dispensing/validator.feature

@@ -20,4 +20,4 @@ Feature: I can call the validator endpoint
     When I make a invalid request to the eps_fhir validator endpoint with show validation set to false
     Then the response indicates a bad request
     And the validator response has many error issue
-    And the validator response has error with diagnostic Failed to parse JSON encoded FHIR content: Content does not appear to be FHIR JSON, first non-whitespace character was: '\"' (must be '{')"}]}
+    And the validator response has error with diagnostic containing "Failed to parse JSON encoded FHIR content"

features/eps_fhir_prescribing/validator.feature

@@ -20,4 +20,4 @@ Feature: I can call the validator endpoint
     When I make a invalid request to the eps_fhir validator endpoint with show validation set to false
     Then the response indicates a bad request
     And the validator response has many error issue
-    And the validator response has error with diagnostic Failed to parse JSON encoded FHIR content: Content does not appear to be FHIR JSON, first non-whitespace character was: '\"' (must be '{')"}]}
+    And the validator response has error with diagnostic containing "Failed to parse JSON encoded FHIR content"

features/steps/eps_api_steps.py

@@ -221,7 +221,7 @@ def validator_response_has_error_issue_with_diagnostic(context, diagnostic):
     json_response = json.loads(context.response.content)
     assert_that(json_response["resourceType"]).is_equal_to("OperationOutcome")
     actual_issue_count = sum(
-        p["severity"] == "error" and p["diagnostics"] == diagnostic
+        p["severity"] == "error" and diagnostic in p["diagnostics"]
         for p in json_response["issue"]
     )
     assert_that(actual_issue_count).is_equal_to(1)