puppeteer/test/jshandle.spec.ts

/**
 * Copyright 2018 Google Inc. All rights reserved.
 *
 * 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 expect from 'expect';
import {
  getTestState,
  setupTestBrowserHooks,
  setupTestPageAndContextHooks,
  itFailsFirefox,
} from './mocha-utils';

describe('JSHandle', function () {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();

  describe('Page.evaluateHandle', function () {
    it('should work', async () => {
      const { page } = getTestState();

      const windowHandle = await page.evaluateHandle(() => window);
      expect(windowHandle).toBeTruthy();
    });
    it('should accept object handle as an argument', async () => {
      const { page } = getTestState();

      const navigatorHandle = await page.evaluateHandle(() => navigator);
      const text = await page.evaluate((e) => e.userAgent, navigatorHandle);
      expect(text).toContain('Mozilla');
    });
    it('should accept object handle to primitive types', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => 5);
      const isFive = await page.evaluate((e) => Object.is(e, 5), aHandle);
      expect(isFive).toBeTruthy();
    });
    it('should warn on nested object handles', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => document.body);
      let error = null;
      await page
        // @ts-expect-error we are deliberately passing a bad type here (nested object)
        .evaluateHandle((opts) => opts.elem.querySelector('p'), {
          elem: aHandle,
        })
        .catch((error_) => (error = error_));
      expect(error.message).toContain('Are you passing a nested JSHandle?');
    });
    it('should accept object handle to unserializable value', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => Infinity);
      expect(await page.evaluate((e) => Object.is(e, Infinity), aHandle)).toBe(
        true
      );
    });
    it('should use the same JS wrappers', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => {
        globalThis.FOO = 123;
        return window;
      });
      expect(await page.evaluate((e) => e.FOO, aHandle)).toBe(123);
    });
    it('should work with primitives', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => {
        globalThis.FOO = 123;
        return window;
      });
      expect(await page.evaluate((e) => e.FOO, aHandle)).toBe(123);
    });
  });

  describe('JSHandle.getProperty', function () {
    it('should work', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => ({
        one: 1,
        two: 2,
        three: 3,
      }));
      const twoHandle = await aHandle.getProperty('two');
      expect(await twoHandle.jsonValue()).toEqual(2);
    });
  });

  describe('JSHandle.jsonValue', function () {
    it('should work', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => ({ foo: 'bar' }));
      const json = await aHandle.jsonValue();
      expect(json).toEqual({ foo: 'bar' });
    });
    itFailsFirefox('should not work with dates', async () => {
      const { page } = getTestState();

      const dateHandle = await page.evaluateHandle(
        () => new Date('2017-09-26T00:00:00.000Z')
      );
      const json = await dateHandle.jsonValue();
      expect(json).toEqual({});
    });
    it('should throw for circular objects', async () => {
      const { page, isChrome } = getTestState();

      const windowHandle = await page.evaluateHandle('window');
      let error = null;
      await windowHandle.jsonValue().catch((error_) => (error = error_));
      if (isChrome)
        expect(error.message).toContain('Object reference chain is too long');
      else expect(error.message).toContain('Object is not serializable');
    });
  });

  describe('JSHandle.getProperties', function () {
    it('should work', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => ({
        foo: 'bar',
      }));
      const properties = await aHandle.getProperties();
      const foo = properties.get('foo');
      expect(foo).toBeTruthy();
      expect(await foo.jsonValue()).toBe('bar');
    });
    it('should return even non-own properties', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => {
        class A {
          a: string;
          constructor() {
            this.a = '1';
          }
        }
        class B extends A {
          b: string;
          constructor() {
            super();
            this.b = '2';
          }
        }
        return new B();
      });
      const properties = await aHandle.getProperties();
      expect(await properties.get('a').jsonValue()).toBe('1');
      expect(await properties.get('b').jsonValue()).toBe('2');
    });
  });

  describe('JSHandle.asElement', function () {
    it('should work', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => document.body);
      const element = aHandle.asElement();
      expect(element).toBeTruthy();
    });
    it('should return null for non-elements', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => 2);
      const element = aHandle.asElement();
      expect(element).toBeFalsy();
    });
    it('should return ElementHandle for TextNodes', async () => {
      const { page } = getTestState();

      await page.setContent('<div>ee!</div>');
      const aHandle = await page.evaluateHandle(
        () => document.querySelector('div').firstChild
      );
      const element = aHandle.asElement();
      expect(element).toBeTruthy();
      expect(
        await page.evaluate((e) => e.nodeType === Node.TEXT_NODE, element)
      );
    });
  });

  describe('JSHandle.toString', function () {
    it('should work for primitives', async () => {
      const { page } = getTestState();

      const numberHandle = await page.evaluateHandle(() => 2);
      expect(numberHandle.toString()).toBe('JSHandle:2');
      const stringHandle = await page.evaluateHandle(() => 'a');
      expect(stringHandle.toString()).toBe('JSHandle:a');
    });
    it('should work for complicated objects', async () => {
      const { page } = getTestState();

      const aHandle = await page.evaluateHandle(() => window);
      expect(aHandle.toString()).toBe('JSHandle@object');
    });
    it('should work with different subtypes', async () => {
      const { page } = getTestState();

      expect((await page.evaluateHandle('(function(){})')).toString()).toBe(
        'JSHandle@function'
      );
      expect((await page.evaluateHandle('12')).toString()).toBe('JSHandle:12');
      expect((await page.evaluateHandle('true')).toString()).toBe(
        'JSHandle:true'
      );
      expect((await page.evaluateHandle('undefined')).toString()).toBe(
        'JSHandle:undefined'
      );
      expect((await page.evaluateHandle('"foo"')).toString()).toBe(
        'JSHandle:foo'
      );
      expect((await page.evaluateHandle('Symbol()')).toString()).toBe(
        'JSHandle@symbol'
      );
      expect((await page.evaluateHandle('new Map()')).toString()).toBe(
        'JSHandle@map'
      );
      expect((await page.evaluateHandle('new Set()')).toString()).toBe(
        'JSHandle@set'
      );
      expect((await page.evaluateHandle('[]')).toString()).toBe(
        'JSHandle@array'
      );
      expect((await page.evaluateHandle('null')).toString()).toBe(
        'JSHandle:null'
      );
      expect((await page.evaluateHandle('/foo/')).toString()).toBe(
        'JSHandle@regexp'
      );
      expect((await page.evaluateHandle('document.body')).toString()).toBe(
        'JSHandle@node'
      );
      expect((await page.evaluateHandle('new Date()')).toString()).toBe(
        'JSHandle@date'
      );
      expect((await page.evaluateHandle('new WeakMap()')).toString()).toBe(
        'JSHandle@weakmap'
      );
      expect((await page.evaluateHandle('new WeakSet()')).toString()).toBe(
        'JSHandle@weakset'
      );
      expect((await page.evaluateHandle('new Error()')).toString()).toBe(
        'JSHandle@error'
      );
      expect((await page.evaluateHandle('new Int32Array()')).toString()).toBe(
        'JSHandle@typedarray'
      );
      expect((await page.evaluateHandle('new Proxy({}, {})')).toString()).toBe(
        'JSHandle@proxy'
      );
    });
  });
});