test(companion): cover heartbeat loop state reset on restart

src/companion/heartbeatLoop.test.ts

@@ -234,4 +234,36 @@ describe('CompanionHeartbeatLoop', () => {
 
     loop.stop();
   });
+
+  it('resets success and failure state when restarted', async () => {
+    const publishHeartbeat = vi
+      .fn<() => Promise<NodeStatusSetResult>>()
+      .mockResolvedValueOnce(buildStatusResult())
+      .mockRejectedValueOnce(new Error('transient'))
+      .mockResolvedValue(buildStatusResult());
+    const loop = new CompanionHeartbeatLoop({ publishHeartbeat }, { intervalMs: 500 });
+
+    loop.start();
+    await Promise.resolve();
+    expect(loop.successCount).toBe(1);
+    expect(loop.failureCount).toBe(0);
+
+    await vi.advanceTimersByTimeAsync(500);
+    expect(loop.failureCount).toBe(1);
+    expect(loop.lastFailure?.message).toBe('transient');
+
+    loop.stop();
+    loop.start(false);
+
+    expect(loop.successCount).toBe(0);
+    expect(loop.lastSuccessAt).toBeNull();
+    expect(loop.failureCount).toBe(0);
+    expect(loop.lastFailure).toBeNull();
+
+    await vi.advanceTimersByTimeAsync(500);
+    expect(loop.successCount).toBe(1);
+    expect(loop.failureCount).toBe(0);
+
+    loop.stop();
+  });
 });