test: create defer util

Author: francoischalifour

packages/autocomplete-core/src/__tests__/concurrency.test.ts

@@ -1,13 +1,8 @@
 import userEvent from '@testing-library/user-event';
 
+import { defer } from '../../../../test/utils';
 import { createAutocomplete } from '../createAutocomplete';
 
-function defer<TValue>(fn: () => TValue, timeout: number) {
-  return new Promise<TValue>((resolve) => {
-    setTimeout(() => resolve(fn()), timeout);
-  });
-}
-
 describe.skip('concurrency', () => {
   test('resolves the responses in order from getSources', async () => {
     // These delays make the second query come back after the third one.

packages/autocomplete-core/src/__tests__/stallThreshold.test.ts

@@ -1,13 +1,8 @@
 import userEvent from '@testing-library/user-event';
 
+import { defer } from '../../../../test/utils';
 import { createAutocomplete } from '../createAutocomplete';
 
-function defer<TValue>(fn: () => TValue, timeout: number) {
-  return new Promise<TValue>((resolve) => {
-    setTimeout(() => resolve(fn()), timeout);
-  });
-}
-
 describe('stallThreshold', () => {
   test('sets the experience to stalled after 300ms', async () => {
     const onStateChange = jest.fn();

packages/autocomplete-core/src/utils/__tests__/createConcurrentSafePromise.test.ts

@@ -1,11 +1,6 @@
+import { defer } from '../../../../../test/utils';
 import { createConcurrentSafePromise } from '../createConcurrentSafePromise';
 
-function defer<TValue>(fn: () => TValue, timeout: number) {
-  return new Promise<TValue>((resolve) => {
-    setTimeout(() => resolve(fn()), timeout);
-  });
-}
-
 describe('createConcurrentSafePromise', () => {
   test('resolves the non-promise values in order', async () => {
     type PromiseValue = { value: number };

test/utils/defer.ts

@@ -0,0 +1,5 @@
+export function defer<TValue>(fn: () => TValue, timeout: number) {
+  return new Promise<TValue>((resolve) => {
+    setTimeout(() => resolve(fn()), timeout);
+  });
+}

test/utils/index.ts

@@ -1,4 +1,5 @@
 export * from './createCollection';
 export * from './createPlayground';
 export * from './createSource';
+export * from './defer';
 export * from './runAllMicroTasks';