playwright/tests/page/jshandle-to-string.spec.ts
Andrey Lushnikov 9ca9b08d90
fix: better formatting for sparse arrays (#20379)
Right now arrays preview yields all array elements. In case
of a sparse array with a single element on index 10000000,
this results in a large string that OOM Node.js.

This patch changes pretty-printing. For example:

```ts
// Given this array
const a = [];
a[10] = 1;
// Before this patch, pretty printing will yield:
"[,,,,,,,,1]"
// With this patch, pretty printing yields:
"[empty x 9, 1]"
```

The new array pretty-printing is equal to what Chrome DevTools
do to render sparse arrays.

Fixes #20347
2023-01-27 05:07:55 -08:00

83 lines
3.7 KiB
TypeScript

/**
* Copyright 2018 Google Inc. All rights reserved.
* Modifications copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { test as it, expect } from './pageTest';
it('should work for primitives', async ({ page }) => {
const numberHandle = await page.evaluateHandle(() => 2);
expect(numberHandle.toString()).toBe('2');
const stringHandle = await page.evaluateHandle(() => 'a');
expect(stringHandle.toString()).toBe('a');
});
it('should work for complicated objects', async ({ page, browserName }) => {
const aHandle = await page.evaluateHandle(() => window);
if (browserName !== 'firefox')
expect(aHandle.toString()).toBe('Window');
else
expect(aHandle.toString()).toBe('JSHandle@object');
});
it('should beautifully render sparse arrays', async ({ page, browserName }) => {
const [msg] = await Promise.all([
page.waitForEvent('console'),
page.evaluateHandle(() => {
const a = [];
a[1] = 1;
a[10] = 2;
a[100] = 3;
console.log(a);
}),
]);
if (browserName === 'firefox')
expect(msg.text()).toBe('Array');
else
expect(msg.text()).toBe('[empty, 1, empty x 8, 2, empty x 89, 3]');
});
it('should work for promises', async ({ page }) => {
// wrap the promise in an object, otherwise we will await.
const wrapperHandle = await page.evaluateHandle(() => ({ b: Promise.resolve(123) }));
const bHandle = await wrapperHandle.getProperty('b');
expect(bHandle.toString()).toBe('Promise');
});
it('should work with different subtypes @smoke', async ({ page, browserName, browserMajorVersion }) => {
expect((await page.evaluateHandle('(function(){})')).toString()).toContain('function');
expect((await page.evaluateHandle('12')).toString()).toBe('12');
expect((await page.evaluateHandle('true')).toString()).toBe('true');
expect((await page.evaluateHandle('undefined')).toString()).toBe('undefined');
expect((await page.evaluateHandle('"foo"')).toString()).toBe('foo');
expect((await page.evaluateHandle('Symbol()')).toString()).toBe('Symbol()');
expect((await page.evaluateHandle('new Map()')).toString()).toContain('Map');
expect((await page.evaluateHandle('new Set()')).toString()).toContain('Set');
expect((await page.evaluateHandle('[]')).toString()).toContain('Array');
expect((await page.evaluateHandle('null')).toString()).toBe('null');
expect((await page.evaluateHandle('document.body')).toString()).toBe('JSHandle@node');
expect((await page.evaluateHandle('new WeakMap()')).toString()).toBe('WeakMap');
expect((await page.evaluateHandle('new WeakSet()')).toString()).toBe('WeakSet');
expect((await page.evaluateHandle('new Error()')).toString()).toContain('Error');
expect((await page.evaluateHandle('new Proxy({}, {})')).toString()).toBe((browserName === 'chromium' && browserMajorVersion >= 111) ? 'Proxy(Object)' : 'Proxy');
});
it('should work with previewable subtypes', async ({ page, browserName }) => {
it.skip(browserName === 'firefox');
expect((await page.evaluateHandle('/foo/')).toString()).toBe('/foo/');
expect((await page.evaluateHandle('new Date(0)')).toString()).toContain('GMT');
expect((await page.evaluateHandle('new Int32Array()')).toString()).toContain('Int32Array');
});