fix: expect.getState().testPath always returns correct path (#6472)

Author: sheremet-va

packages/expect/src/state.ts

@@ -39,6 +39,10 @@ export function setState<State extends MatcherState = MatcherState>(
 ): void {
   const map = (globalThis as any)[MATCHERS_OBJECT]
   const current = map.get(expect) || {}
-  Object.assign(current, state)
-  map.set(expect, current)
+  // so it keeps getters from `testPath`
+  const results = Object.defineProperties(current, {
+    ...Object.getOwnPropertyDescriptors(current),
+    ...Object.getOwnPropertyDescriptors(state),
+  })
+  map.set(expect, results)
 }

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

@@ -39,7 +39,6 @@ export function createExpect(test?: TaskPopulated) {
   // @ts-expect-error global is not typed
   const globalState = getState(globalThis[GLOBAL_EXPECT]) || {}
 
-  const testPath = getTestFile(test)
   setState<MatcherState>(
     {
       // this should also add "snapshotState" that is added conditionally
@@ -50,7 +49,9 @@ export function createExpect(test?: TaskPopulated) {
       expectedAssertionsNumber: null,
       expectedAssertionsNumberErrorGen: null,
       environment: getCurrentEnvironment(),
-      testPath,
+      get testPath() {
+        return getWorkerState().filepath
+      },
       currentTestName: test
         ? getTestName(test as Test)
         : globalState.currentTestName,
@@ -111,14 +112,6 @@ export function createExpect(test?: TaskPopulated) {
   return expect
 }
 
-function getTestFile(test?: TaskPopulated) {
-  if (test) {
-    return test.file.filepath
-  }
-  const state = getWorkerState()
-  return state.filepath
-}
-
 const globalExpect = createExpect()
 
 Object.defineProperty(globalThis, GLOBAL_EXPECT, {

test/core/test/basic.test.ts

@@ -2,6 +2,11 @@ import { assert, expect, it, suite, test } from 'vitest'
 import { two } from '../src/submodule'
 import { timeout } from '../src/timeout'
 
+const testPath = expect.getState().testPath
+if (!testPath || !testPath.includes('basic.test.ts')) {
+  throw new Error(`testPath is not correct: ${testPath}`)
+}
+
 test('Math.sqrt()', async () => {
   assert.equal(Math.sqrt(4), two)
   assert.equal(Math.sqrt(2), Math.SQRT2)