From e754a63e99309458d3de3b22cceff9a53e2b30b7 Mon Sep 17 00:00:00 2001
From: Anthony Fu <anthonyfu117@hotmail.com>
Date: Sat, 14 Aug 2021 10:23:19 +0800
Subject: [PATCH] test: add failed test for #498 (#638)

---
 test/v3/runtime-core/apiWatch.spec.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/test/v3/runtime-core/apiWatch.spec.ts b/test/v3/runtime-core/apiWatch.spec.ts
index 6fde5b24..d1f440a1 100644
--- a/test/v3/runtime-core/apiWatch.spec.ts
+++ b/test/v3/runtime-core/apiWatch.spec.ts
@@ -532,6 +532,28 @@ describe('api: watch', () => {
     expect(data2.value).toMatchObject([1])
   })
 
+  // #498
+  it('watchEffect should not lead to infinite loop when accessing', async () => {
+    let dummy = 0
+
+    const state = reactive({
+      data: [],
+      watchVar: 123,
+    })
+
+    watchEffect(() => {
+      // accessing
+      state.watchVar
+      // setting
+      state.data = []
+      dummy += 1
+    })
+
+    expect(dummy).toBe(1)
+    await nextTick()
+    expect(dummy).toBe(1)
+  })
+
   it('watching deep ref', async () => {
     const count = ref(0)
     const double = computed(() => count.value * 2)