fix(browser): not.toBeInTheDocument works with locators API

packages/browser/matchers.d.ts

@@ -16,7 +16,7 @@ declare module 'vitest' {
   type PromisifyDomAssertion<T> = Promisify<Assertion<T>>
 
   interface ExpectStatic {
-    element: <T extends Element | Locator>(element: T, options?: ExpectPollOptions) => PromisifyDomAssertion<Awaited<Element>>
+    element: <T extends Element | Locator>(element: T, options?: ExpectPollOptions) => PromisifyDomAssertion<Awaited<Element | null>>
   }
 }
 

packages/browser/src/client/tester/expect-element.ts

@@ -1,7 +1,7 @@
 import * as matchers from '@testing-library/jest-dom/matchers'
 import type { Locator } from '@vitest/browser/context'
 import type { ExpectPollOptions } from 'vitest'
-import { expect } from 'vitest'
+import { chai, expect } from 'vitest'
 
 export async function setupExpectDom() {
   expect.extend(matchers)
@@ -10,10 +10,16 @@ export async function setupExpectDom() {
       throw new Error(`Invalid element or locator: ${elementOrLocator}. Expected an instance of Element or Locator, received ${typeof elementOrLocator}`)
     }
 
-    return expect.poll<Element>(() => {
-      if (elementOrLocator instanceof Element) {
+    return expect.poll<Element | null>(function element(this: object) {
+      if (elementOrLocator instanceof Element || elementOrLocator == null) {
         return elementOrLocator
       }
+      const isNot = chai.util.flag(this, 'negate')
+      const name = chai.util.flag(this, '_name')
+      // special case for `toBeInTheDocument` matcher
+      if (isNot && name === 'toBeInTheDocument') {
+        return elementOrLocator.query()
+      }
       return elementOrLocator.element()
     }, options)
   }

packages/expect/src/jest-expect.ts

@@ -22,7 +22,7 @@ import {
   stringify,
 } from './jest-matcher-utils'
 import { JEST_MATCHERS_OBJECT } from './constants'
-import { recordAsyncExpect, wrapSoft } from './utils'
+import { recordAsyncExpect, wrapAssertion } from './utils'
 
 // polyfill globals because expect can be used in node environment
 declare class Node {
@@ -43,7 +43,7 @@ export const JestChaiExpect: ChaiPlugin = (chai, utils) => {
     fn: (this: Chai.AssertionStatic & Assertion, ...args: any[]) => any,
   ) {
     const addMethod = (n: keyof Assertion) => {
-      const softWrapper = wrapSoft(utils, fn)
+      const softWrapper = wrapAssertion(utils, n, fn)
       utils.addMethod(chai.Assertion.prototype, n, softWrapper)
       utils.addMethod(
         (globalThis as any)[JEST_MATCHERS_OBJECT].matchers,

packages/expect/src/jest-extend.ts

@@ -18,7 +18,7 @@ import {
 } from './jest-matcher-utils'
 
 import { equals, iterableEquality, subsetEquality } from './jest-utils'
-import { wrapSoft } from './utils'
+import { wrapAssertion } from './utils'
 
 function getMatcherState(
   assertion: Chai.AssertionStatic & Chai.Assertion,
@@ -96,7 +96,7 @@ function JestExtendPlugin(
           }
         }
 
-        const softWrapper = wrapSoft(utils, expectWrapper)
+        const softWrapper = wrapAssertion(utils, expectAssertionName, expectWrapper)
         utils.addMethod(
           (globalThis as any)[JEST_MATCHERS_OBJECT].matchers,
           expectAssertionName,

packages/expect/src/utils.ts

@@ -26,11 +26,14 @@ export function recordAsyncExpect(
   return promise
 }
 
-export function wrapSoft(
+export function wrapAssertion(
   utils: Chai.ChaiUtils,
+  name: string,
   fn: (this: Chai.AssertionStatic & Assertion, ...args: any[]) => void,
 ) {
   return function (this: Chai.AssertionStatic & Assertion, ...args: any[]) {
+    utils.flag(this, '_name', name)
+
     if (!utils.flag(this, 'soft')) {
       return fn.apply(this, args)
     }

packages/vitest/src/integrations/chai/poll.ts

@@ -38,6 +38,7 @@ export function createExpectPoll(expect: ExpectStatic): ExpectStatic['poll'] {
     const assertion = expect(null, message).withContext({
       poll: true,
     }) as Assertion
+    fn = fn.bind(assertion)
     const proxy: any = new Proxy(assertion, {
       get(target, key, receiver) {
         const assertionFunction = Reflect.get(target, key, receiver)
@@ -75,6 +76,7 @@ export function createExpectPoll(expect: ExpectStatic): ExpectStatic['poll'] {
             }, timeout)
             const check = async () => {
               try {
+                chai.util.flag(assertion, '_name', key)
                 const obj = await fn()
                 chai.util.flag(assertion, 'object', obj)
                 resolve(await assertionFunction.call(assertion, ...args))

test/browser/test/dom.test.ts

@@ -15,6 +15,10 @@ describe('dom related activity', () => {
     expect(window.innerHeight).toBe(600)
   })
 
+  test('element doesn\'t exist', async () => {
+    await expect.element(page.getByText('empty')).not.toBeInTheDocument()
+  })
+
   test('renders div', async () => {
     const wrapper = createWrapper()
     const div = createNode()