fix #22571 (OpenAPINormalizer): Removed reset of OAS content (#22573)

* fix (OpenAPINormalizer): Removed reset of OAS content

* feat (Normalizer): Reset from Normalizer with 3.0 only. Fix tests

Author: JPPortier

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -1557,10 +1557,12 @@ protected Schema processSimplifyOneOf(Schema schema) {
             }
 
             schema = simplifyOneOfAnyOfWithOnlyOneNonNullSubSchema(openAPI, schema, oneOfSchemas);
-
             if (ModelUtils.isIntegerSchema(schema) || ModelUtils.isNumberSchema(schema) || ModelUtils.isStringSchema(schema)) {
-                // TODO convert oneOf const to enum
-                schema.setOneOf(null);
+                if (schema.getSpecVersion().equals(SpecVersion.V30)) {
+                    schema.setOneOf(null);
+                } //else {
+                    // TODO convert oneOf const/deprecated to enum
+               // }
             }
         }
 

modules/openapi-generator/src/test/java/org/openapitools/codegen/OpenAPINormalizerTest.java

@@ -1237,8 +1237,9 @@ public void testOpenAPINormalizerSimplifyOneOfAnyOf31Spec() {
         assertEquals(schema14.getType(), null);
 
         Schema schema16 = openAPI.getComponents().getSchemas().get("TypeIntegerWithOneOf");
-        // oneOf should have been removed as the schema is essentially a primitive type
-        assertEquals(schema16.getOneOf(), null);
+        assertEquals(schema16.getOneOf().size(),3);
+        assertEquals(((Schema) schema16.getOneOf().get(0)).getConst(), 1);
+        assertEquals(((Schema) schema16.getOneOf().get(0)).getDeprecated(), true);
 
         Schema schema18 = openAPI.getComponents().getSchemas().get("OneOfNullAndRef3");
         // original oneOf removed and simplified to just $ref (oneOf sub-schema) instead

modules/openapi-generator/src/test/resources/3_1/simplifyOneOfAnyOf_test.yaml

@@ -130,6 +130,7 @@ components:
         - title: ITEM A
           description: This permission is for item A.
           const: 1
+          deprecated: true
         - title: ITEM B
           description: This permission is for item B.
           const: 2