bugfix: exclude 406 status code violations (#48)

Author: pboos

openapi-validation-api/src/main/java/com/getyourguide/openapi/validation/api/Rules.java

@@ -9,5 +9,6 @@ public static class Request {
 
     public static class Response {
         public static final String BODY_SCHEMA_ONE_OF = "validation.response.body.schema.oneOf";
+        public static final String STATUS_UNKNOWN = "validation.response.status.unknown";
     }
 }

openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/exclusions/InternalViolationExclusions.java

@@ -15,6 +15,7 @@ public boolean isExcluded(OpenApiViolation violation) {
         return falsePositive404(violation)
             || falsePositive400(violation)
             || falsePositive405(violation)
+            || falsePositive406(violation)
             || customViolationExclusions.isExcluded(violation)
             || oneOfMatchesMoreThanOneSchema(violation);
     }
@@ -47,4 +48,9 @@ private boolean falsePositive405(OpenApiViolation violation) {
         return violation.getResponseStatus().orElse(0) == 405
             && Rules.Request.OPERATION_NOT_ALLOWED.equals(violation.getRule());
     }
+
+    private boolean falsePositive406(OpenApiViolation violation) {
+        return violation.getResponseStatus().orElse(0) == 406
+            && Rules.Response.STATUS_UNKNOWN.equals(violation.getRule());
+    }
 }

openapi-validation-core/src/test/java/com/getyourguide/openapi/validation/core/exclusions/InternalViolationExclusionsTest.java

@@ -145,6 +145,18 @@ public void when405ResponseCodeWithOperationNotAllowedViolationThenViolationExcl
             .build());
     }
 
+    @Test
+    public void when406ResponseCodeWithStatusUnknownViolationThenViolationExcluded() {
+        when(customViolationExclusions.isExcluded(any())).thenReturn(false);
+
+        checkViolationExcluded(OpenApiViolation.builder()
+            .direction(Direction.RESPONSE)
+            .rule("validation.response.status.unknown")
+            .responseStatus(406)
+            .message("")
+            .build());
+    }
+
     private void checkViolationNotExcluded(OpenApiViolation violation) {
         var isExcluded = violationExclusions.isExcluded(violation);