From ea61ff3d035872828fc712430a28d3a2f660b0a8 Mon Sep 17 00:00:00 2001
From: revisedbytom <322501590+revisedbytom@users.noreply.github.com>
Date: Sat, 29 Aug 2026 15:57:37 +0100
Subject: [PATCH] test(sample-controllers): demonstrate messenger interactions

Show how controller tests can assert delegated action calls and published state events without changing production behavior.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 .../src/sample-gas-prices-controller.test.ts  | 22 +++++++++++++++++++
 .../src/sample-petnames-controller.test.ts    | 22 +++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/packages/sample-controllers/src/sample-gas-prices-controller.test.ts b/packages/sample-controllers/src/sample-gas-prices-controller.test.ts
index d0d345a034e..794e1645815 100644
--- a/packages/sample-controllers/src/sample-gas-prices-controller.test.ts
+++ b/packages/sample-controllers/src/sample-gas-prices-controller.test.ts
@@ -335,6 +335,28 @@ describe('SampleGasPricesController', () => {
         });
       });
     });
+
+    it('calls the gas prices service through the messenger', async () => {
+      await withController(async ({ controller, rootMessenger, messenger }) => {
+        const chainId = '0x42';
+        rootMessenger.registerActionHandler(
+          'SampleGasPricesService:fetchGasPrices',
+          async () => ({
+            low: 5,
+            average: 10,
+            high: 15,
+          }),
+        );
+        const messengerCall = jest.spyOn(messenger, 'call');
+
+        await controller.updateGasPrices({ chainId });
+
+        expect(messengerCall).toHaveBeenCalledWith(
+          'SampleGasPricesService:fetchGasPrices',
+          chainId,
+        );
+      });
+    });
   });
 
   describe('metadata', () => {
diff --git a/packages/sample-controllers/src/sample-petnames-controller.test.ts b/packages/sample-controllers/src/sample-petnames-controller.test.ts
index 68a4217779c..adae29f26d9 100644
--- a/packages/sample-controllers/src/sample-petnames-controller.test.ts
+++ b/packages/sample-controllers/src/sample-petnames-controller.test.ts
@@ -190,6 +190,28 @@ describe('SamplePetnamesController', () => {
         },
       );
     });
+
+    it('publishes state changes through the messenger', async () => {
+      await withController(({ controller, controllerMessenger }) => {
+        const stateChangeListener = jest.fn();
+        controllerMessenger.subscribe(
+          // eslint-disable-next-line no-restricted-syntax
+          'SamplePetnamesController:stateChange',
+          stateChangeListener,
+        );
+
+        controller.assignPetname('0x1', '0xAAAAAA', 'Account 1');
+
+        expect(stateChangeListener).toHaveBeenCalledTimes(1);
+        expect(stateChangeListener.mock.calls[0][0]).toStrictEqual({
+          namesByChainIdAndAddress: {
+            '0x1': {
+              '0xaaaaaa': 'Account 1',
+            },
+          },
+        });
+      });
+    });
   });
 
   describe('metadata', () => {