fix: check if component unmounted in Wrapper.exists() (#1629)

* fix: check if component unmounted in Wrapper.exists()

* chore(exists): move exists check to VueWrapper

Co-authored-by: Illya Klymov <xanf@xanf.me>

src/vueWrapper.ts

@@ -107,6 +107,10 @@ export class VueWrapper<
     return this.vm.$
   }
 
+  exists() {
+    return !this.getCurrentComponent().isUnmounted
+  }
+
   findAll<K extends keyof HTMLElementTagNameMap>(
     selector: K
   ): DOMWrapper<HTMLElementTagNameMap[K]>[]

tests/exists.spec.ts

@@ -22,4 +22,31 @@ describe('exists', () => {
     const wrapper = mount(Component)
     expect(wrapper.find('#msg').exists()).toBe(true)
   })
+
+  it('returns false when component destroyed', async () => {
+    const ChildComponent = defineComponent({
+      render() {
+        return h('div')
+      }
+    })
+    const Component = defineComponent({
+      props: {
+        hide: {
+          type: Boolean,
+          default: false
+        }
+      },
+      render() {
+        if (this.hide) {
+          return h('div')
+        } else {
+          return h(ChildComponent)
+        }
+      }
+    })
+    const wrapper = mount(Component)
+    const child = wrapper.findComponent(ChildComponent)
+    await wrapper.setProps({ hide: true })
+    expect(child.exists()).toBe(false)
+  })
 })