diff --git a/packages/frontend-plugin-api/src/wiring/createExtension.test.ts b/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
index 30375049bf..547ec2a160 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
+++ b/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
@@ -660,6 +660,57 @@ describe('createExtension', () => {
       expect(true).toBe(true);
     });
 
+    it('should allow overriding the returned values from the parent factory', () => {
+      const testExtension = createExtension({
+        kind: 'thing',
+        namespace: 'test',
+        attachTo: { id: 'root', input: 'default' },
+        output: [stringDataRef, numberDataRef],
+        config: {
+          schema: {
+            foo: z => z.string().default('boom'),
+          },
+        },
+        factory({ config }) {
+          return [stringDataRef(config.foo), numberDataRef(42)];
+        },
+      });
+
+      const overridden = testExtension.override({
+        output: [numberDataRef, stringDataRef],
+        *factory(originalFactory) {
+          const output = originalFactory();
+          yield* output;
+
+          yield numberDataRef(output.get(numberDataRef) + 1);
+        },
+      });
+
+      const overridden = testExtension.override({
+        output: [numberDataRef, stringDataRef],
+        *factory(originalFactory) {
+          const output = originalFactory();
+          yield* output.omit(numberDataRef);
+
+          yield numberDataRef(output.get(numberDataRef) + 1);
+        },
+      });
+
+      const overridden = testExtension.override({
+        output: [numberDataRef, stringDataRef],
+        *factory(originalFactory) {
+          const output = originalFactory();
+          yield* output;
+
+          yield numberDataRef(output.get(numberDataRef) + 1);
+        },
+      });
+
+      const tester = createExtensionTester(overridden);
+
+      expect(tester.data(numberDataRef)).toBe(43);
+    });
+
     it('should work functionally with overrides', () => {
       const testExtension = createExtension({
         kind: 'thing',