Fix: Address Sonar Blocker issues

core/src/test/java/org/openapitools/openapidiff/core/AllOfOneOfDiffTest.java

@@ -9,6 +9,6 @@ public class AllOfOneOfDiffTest {
   @Test
   void allOfReferringToOneOfSchemasAreSupported() {
     ChangedOpenApi diff = OpenApiCompare.fromLocations("issue-317_1.json", "issue-317_2.json");
-    assertThat(diff.isCoreChanged().isUnchanged());
+    assertThat(diff.isCoreChanged().isUnchanged()).isTrue();
   }
 }

core/src/test/java/org/openapitools/openapidiff/core/SchemaDiffTest.java

@@ -41,8 +41,15 @@ public void schemaPropertyDefaultChanged() {
   public void schemaPropertyTypeChanged() {
     ChangedOpenApi changedOpenApi =
         OpenApiCompare.fromLocations(
-            "schemaDiff/schema-props-defaults-handling-1.yaml",
-            "schemaDiff/schema-props-defaults-handling-2.yaml");
+            "schemaDiff/schema-props-type-handling-1.yaml",
+            "schemaDiff/schema-props-type-handling-2.yaml");
+
+    assertEquals(1, changedOpenApi.getChangedOperations().size());
+    assertEquals(1, changedOpenApi.getChangedSchemas().size());
+    ChangedSchema changedSchema = changedOpenApi.getChangedSchemas().get(0);
+    assertEquals(1, changedSchema.getChangedProperties().size());
+    assertTrue(changedSchema.getChangedProperties().containsKey("field1"));
+    assertTrue(changedSchema.getChangedProperties().get("field1").isChangedType());
   }
 
   @Test // issue #485

core/src/test/resources/schemaDiff/schema-props-type-handling-1.yaml

@@ -0,0 +1,23 @@
+openapi: 3.0.0
+info:
+  title: Schema Type Handling Test - Before
+  version: 1.0.0
+paths:
+  /test:
+    post:
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TestSchema'
+      responses:
+        '200':
+          description: OK
+components:
+  schemas:
+    TestSchema:
+      type: object
+      properties:
+        field1:
+          type: string
+          description: A field that will change type

core/src/test/resources/schemaDiff/schema-props-type-handling-2.yaml

@@ -0,0 +1,23 @@
+openapi: 3.0.0
+info:
+  title: Schema Type Handling Test - After
+  version: 1.0.0
+paths:
+  /test:
+    post:
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TestSchema'
+      responses:
+        '200':
+          description: OK
+components:
+  schemas:
+    TestSchema:
+      type: object
+      properties:
+        field1:
+          type: integer # Changed from string to integer
+          description: A field that has changed type