Add test cases

Author: issy

core/src/test/java/org/openapitools/openapidiff/core/backcompat/OperationBCTest.java

@@ -1,9 +1,11 @@
 package org.openapitools.openapidiff.core.backcompat;
 
 import static org.openapitools.openapidiff.core.TestUtils.assertSpecChangedButCompatible;
+import static org.openapitools.openapidiff.core.TestUtils.assertSpecIncompatible;
 import static org.openapitools.openapidiff.core.TestUtils.assertSpecUnchanged;
 
 import org.junit.jupiter.api.Test;
+import org.openapitools.openapidiff.core.model.BackwardIncompatibleProp;
 
 public class OperationBCTest {
   private final String BASE = "bc_operation_base.yaml";
@@ -17,4 +19,14 @@ public void unchanged() {
   public void changedButCompatible() {
     assertSpecChangedButCompatible(BASE, "bc_operation_changed_but_compatible.yaml");
   }
+
+  @Test
+  public void operationIdChangedButCompatible() {
+    assertSpecChangedButCompatible(BASE, "bc_operation_changed_incompatible_operation_id.yaml");
+  }
+
+  @Test
+  public void operationIdChangedInCompatibleWithFlagSet() {
+    assertSpecIncompatible(BASE, "bc_operation_changed_incompatible_operation_id.yaml", BackwardIncompatibleProp.OPERATION_ID_CHANGED);
+  }
 }

core/src/test/resources/bc_operation_changed_incompatible_operation_id.yaml

@@ -0,0 +1,16 @@
+openapi: 3.0.0
+info:
+  description: myDesc
+  title: myTitle
+  version: 1.0.0
+paths:
+  /widgets:
+    get:
+      operationId: listWidgetsV2
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string