test: add assertions for cleanup scope length in templateRef tests

Author: edison1105

packages/runtime-vapor/__tests__/dom/templateRef.spec.ts

@@ -779,16 +779,19 @@ describe('api: template ref', () => {
 
     expect(fn1).toHaveBeenCalledTimes(1)
     expect(fn2).toHaveBeenCalledTimes(0)
+    expect(app._instance!.scope.cleanups.length).toBe(1)
 
     toggle.value = false
     await nextTick()
     expect(fn1).toHaveBeenCalledTimes(1)
     expect(fn2).toHaveBeenCalledTimes(1)
+    expect(app._instance!.scope.cleanups.length).toBe(1)
 
     toggle.value = true
     await nextTick()
     expect(fn1).toHaveBeenCalledTimes(2)
     expect(fn2).toHaveBeenCalledTimes(1)
+    expect(app._instance!.scope.cleanups.length).toBe(1)
 
     app.unmount()
     await nextTick()
@@ -823,11 +826,13 @@ describe('api: template ref', () => {
 
     expect(el1.value).toBe(host.children[0])
     expect(el2.value).toBe(null)
+    expect(app._instance!.scope.cleanups.length).toBe(1)
 
     toggle.value = false
     await nextTick()
     expect(el1.value).toBe(null)
     expect(el2.value).toBe(host.children[0])
+    expect(app._instance!.scope.cleanups.length).toBe(1)
 
     app.unmount()
     await nextTick()