puppeteer/test/src/evaluation.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,
} from './mocha-utils.js';
import {attachFrame} from './utils.js';

describe('Evaluation specs', function () {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();

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

      const result = await page.evaluate(() => {
        return 7 * 3;
      });
      expect(result).toBe(21);
    });
    it('should transfer BigInt', async () => {
      const {page} = getTestState();

      const result = await page.evaluate((a: bigint) => {
        return a;
      }, BigInt(42));
      expect(result).toBe(BigInt(42));
    });
    it('should transfer NaN', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(a => {
        return a;
      }, NaN);
      expect(Object.is(result, NaN)).toBe(true);
    });
    it('should transfer -0', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(a => {
        return a;
      }, -0);
      expect(Object.is(result, -0)).toBe(true);
    });
    it('should transfer Infinity', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(a => {
        return a;
      }, Infinity);
      expect(Object.is(result, Infinity)).toBe(true);
    });
    it('should transfer -Infinity', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(a => {
        return a;
      }, -Infinity);
      expect(Object.is(result, -Infinity)).toBe(true);
    });
    it('should transfer arrays', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(
        a => {
          return a;
        },
        [1, 2, 3]
      );
      expect(result).toEqual([1, 2, 3]);
    });
    it('should transfer arrays as arrays, not objects', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(
        a => {
          return Array.isArray(a);
        },
        [1, 2, 3]
      );
      expect(result).toBe(true);
    });
    it('should modify global environment', async () => {
      const {page} = getTestState();

      await page.evaluate(() => {
        return ((globalThis as any).globalVar = 123);
      });
      expect(await page.evaluate('globalVar')).toBe(123);
    });
    it('should evaluate in the page context', async () => {
      const {page, server} = getTestState();

      await page.goto(server.PREFIX + '/global-var.html');
      expect(await page.evaluate('globalVar')).toBe(123);
    });
    it('should return undefined for objects with symbols', async () => {
      const {page} = getTestState();

      expect(
        await page.evaluate(() => {
          return [Symbol('foo4')];
        })
      ).toBe(undefined);
    });
    it('should work with function shorthands', async () => {
      const {page} = getTestState();

      const a = {
        sum(a: number, b: number) {
          return a + b;
        },

        async mult(a: number, b: number) {
          return a * b;
        },
      };
      expect(await page.evaluate(a.sum, 1, 2)).toBe(3);
      expect(await page.evaluate(a.mult, 2, 4)).toBe(8);
    });
    it('should work with unicode chars', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(
        a => {
          return a['中文字符'];
        },
        {
          中文字符: 42,
        }
      );
      expect(result).toBe(42);
    });
    it('should throw when evaluation triggers reload', async () => {
      const {page} = getTestState();

      let error!: Error;
      await page
        .evaluate(() => {
          location.reload();
          return new Promise(() => {});
        })
        .catch(error_ => {
          return (error = error_);
        });
      expect(error.message).toContain('Protocol error');
    });
    it('should await promise', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return Promise.resolve(8 * 7);
      });
      expect(result).toBe(56);
    });
    it('should work right after framenavigated', async () => {
      const {page, server} = getTestState();

      let frameEvaluation = null;
      page.on('framenavigated', async frame => {
        frameEvaluation = frame.evaluate(() => {
          return 6 * 7;
        });
      });
      await page.goto(server.EMPTY_PAGE);
      expect(await frameEvaluation).toBe(42);
    });
    it('should work from-inside an exposed function', async () => {
      const {page} = getTestState();

      // Setup inpage callback, which calls Page.evaluate
      await page.exposeFunction(
        'callController',
        async function (a: number, b: number) {
          return await page.evaluate(
            (a: number, b: number): number => {
              return a * b;
            },
            a,
            b
          );
        }
      );
      const result = await page.evaluate(async function () {
        return await (globalThis as any).callController(9, 3);
      });
      expect(result).toBe(27);
    });
    it('should reject promise with exception', async () => {
      const {page} = getTestState();

      let error!: Error;
      await page
        .evaluate(() => {
          // @ts-expect-error we know the object doesn't exist
          return notExistingObject.property;
        })
        .catch(error_ => {
          return (error = error_);
        });
      expect(error).toBeTruthy();
      expect(error.message).toContain('notExistingObject');
    });
    it('should support thrown strings as error messages', async () => {
      const {page} = getTestState();

      let error!: Error;
      await page
        .evaluate(() => {
          throw 'qwerty';
        })
        .catch(error_ => {
          return (error = error_);
        });
      expect(error).toEqual('qwerty');
    });
    it('should support thrown numbers as error messages', async () => {
      const {page} = getTestState();

      let error!: Error;
      await page
        .evaluate(() => {
          throw 100500;
        })
        .catch(error_ => {
          return (error = error_);
        });
      expect(error).toEqual(100500);
    });
    it('should return complex objects', async () => {
      const {page} = getTestState();

      const object = {foo: 'bar!'};
      const result = await page.evaluate(a => {
        return a;
      }, object);
      expect(result).not.toBe(object);
      expect(result).toEqual(object);
    });
    it('should return BigInt', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return BigInt(42);
      });
      expect(result).toBe(BigInt(42));
    });
    it('should return NaN', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return NaN;
      });
      expect(Object.is(result, NaN)).toBe(true);
    });
    it('should return -0', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return -0;
      });
      expect(Object.is(result, -0)).toBe(true);
    });
    it('should return Infinity', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return Infinity;
      });
      expect(Object.is(result, Infinity)).toBe(true);
    });
    it('should return -Infinity', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return -Infinity;
      });
      expect(Object.is(result, -Infinity)).toBe(true);
    });
    it('should accept "null" as one of multiple parameters', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(
        (a, b) => {
          return Object.is(a, null) && Object.is(b, 'foo');
        },
        null,
        'foo'
      );
      expect(result).toBe(true);
    });
    it('should properly serialize null fields', async () => {
      const {page} = getTestState();

      expect(
        await page.evaluate(() => {
          return {a: undefined};
        })
      ).toEqual({});
    });
    it('should return undefined for non-serializable objects', async () => {
      const {page} = getTestState();

      expect(
        await page.evaluate(() => {
          return window;
        })
      ).toBe(undefined);
    });
    it('should return promise as empty object', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        return {
          promise: new Promise(resolve => {
            setTimeout(resolve, 1000);
          }),
        };
      });
      expect(result).toEqual({
        promise: {},
      });
    });
    it('should fail for circular object', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        const a: {[x: string]: any} = {};
        const b = {a};
        a['b'] = b;
        return a;
      });
      expect(result).toBe(undefined);
    });
    it('should be able to throw a tricky error', async () => {
      const {page} = getTestState();

      const windowHandle = await page.evaluateHandle(() => {
        return window;
      });
      const errorText = await windowHandle.jsonValue().catch(error_ => {
        return error_.message;
      });
      const error = await page
        .evaluate(errorText => {
          throw new Error(errorText);
        }, errorText)
        .catch(error_ => {
          return error_;
        });
      expect(error.message).toContain(errorText);
    });
    it('should accept a string', async () => {
      const {page} = getTestState();

      const result = await page.evaluate('1 + 2');
      expect(result).toBe(3);
    });
    it('should accept a string with semi colons', async () => {
      const {page} = getTestState();

      const result = await page.evaluate('1 + 5;');
      expect(result).toBe(6);
    });
    it('should accept a string with comments', async () => {
      const {page} = getTestState();

      const result = await page.evaluate('2 + 5;\n// do some math!');
      expect(result).toBe(7);
    });
    it('should accept element handle as an argument', async () => {
      const {page} = getTestState();

      await page.setContent('<section>42</section>');
      const element = (await page.$('section'))!;
      const text = await page.evaluate(e => {
        return e.textContent;
      }, element);
      expect(text).toBe('42');
    });
    it('should throw if underlying element was disposed', async () => {
      const {page} = getTestState();

      await page.setContent('<section>39</section>');
      const element = (await page.$('section'))!;
      expect(element).toBeTruthy();
      await element.dispose();
      let error!: Error;
      await page
        .evaluate((e: HTMLElement) => {
          return e.textContent;
        }, element)
        .catch(error_ => {
          return (error = error_);
        });
      expect(error.message).toContain('JSHandle is disposed');
    });
    it('should throw if elementHandles are from other frames', async () => {
      const {page, server} = getTestState();

      await attachFrame(page, 'frame1', server.EMPTY_PAGE);
      const bodyHandle = await page.frames()[1]!.$('body');
      let error!: Error;
      await page
        .evaluate(body => {
          return body?.innerHTML;
        }, bodyHandle)
        .catch(error_ => {
          return (error = error_);
        });
      expect(error).toBeTruthy();
      expect(error.message).toContain(
        'JSHandles can be evaluated only in the context they were created'
      );
    });
    it('should simulate a user gesture', async () => {
      const {page} = getTestState();

      const result = await page.evaluate(() => {
        document.body.appendChild(document.createTextNode('test'));
        document.execCommand('selectAll');
        return document.execCommand('copy');
      });
      expect(result).toBe(true);
    });
    it('should throw a nice error after a navigation', async () => {
      const {page} = getTestState();

      const executionContext = await page.mainFrame().executionContext();

      await Promise.all([
        page.waitForNavigation(),
        executionContext.evaluate(() => {
          return window.location.reload();
        }),
      ]);
      const error = await executionContext
        .evaluate(() => {
          return null;
        })
        .catch(error_ => {
          return error_;
        });
      expect((error as Error).message).toContain('navigation');
    });
    it('should not throw an error when evaluation does a navigation', async () => {
      const {page, server} = getTestState();

      await page.goto(server.PREFIX + '/one-style.html');
      const result = await page.evaluate(() => {
        (window as any).location = '/empty.html';
        return [42];
      });
      expect(result).toEqual([42]);
    });
    it('should transfer 100Mb of data from page to node.js', async function () {
      this.timeout(25_000);
      const {page} = getTestState();

      const a = await page.evaluate(() => {
        return Array(100 * 1024 * 1024 + 1).join('a');
      });
      expect(a.length).toBe(100 * 1024 * 1024);
    });
    it('should throw error with detailed information on exception inside promise', async () => {
      const {page} = getTestState();

      let error!: Error;
      await page
        .evaluate(() => {
          return new Promise(() => {
            throw new Error('Error in promise');
          });
        })
        .catch(error_ => {
          return (error = error_);
        });
      expect(error.message).toContain('Error in promise');
    });
  });

  describe('Page.evaluateOnNewDocument', function () {
    it('should evaluate before anything else on the page', async () => {
      const {page, server} = getTestState();

      await page.evaluateOnNewDocument(function () {
        (globalThis as any).injected = 123;
      });
      await page.goto(server.PREFIX + '/tamperable.html');
      expect(
        await page.evaluate(() => {
          return (globalThis as any).result;
        })
      ).toBe(123);
    });
    it('should work with CSP', async () => {
      const {page, server} = getTestState();

      server.setCSP('/empty.html', 'script-src ' + server.PREFIX);
      await page.evaluateOnNewDocument(function () {
        (globalThis as any).injected = 123;
      });
      await page.goto(server.PREFIX + '/empty.html');
      expect(
        await page.evaluate(() => {
          return (globalThis as any).injected;
        })
      ).toBe(123);

      // Make sure CSP works.
      await page.addScriptTag({content: 'window.e = 10;'}).catch(error => {
        return void error;
      });
      expect(
        await page.evaluate(() => {
          return (window as any).e;
        })
      ).toBe(undefined);
    });
  });

  describe('Frame.evaluate', function () {
    it('should have different execution contexts', async () => {
      const {page, server} = getTestState();

      await page.goto(server.EMPTY_PAGE);
      await attachFrame(page, 'frame1', server.EMPTY_PAGE);
      expect(page.frames()).toHaveLength(2);
      await page.frames()[0]!.evaluate(() => {
        return ((globalThis as any).FOO = 'foo');
      });
      await page.frames()[1]!.evaluate(() => {
        return ((globalThis as any).FOO = 'bar');
      });
      expect(
        await page.frames()[0]!.evaluate(() => {
          return (globalThis as any).FOO;
        })
      ).toBe('foo');
      expect(
        await page.frames()[1]!.evaluate(() => {
          return (globalThis as any).FOO;
        })
      ).toBe('bar');
    });
    it('should have correct execution contexts', async () => {
      const {page, server} = getTestState();

      await page.goto(server.PREFIX + '/frames/one-frame.html');
      expect(page.frames()).toHaveLength(2);
      expect(
        await page.frames()[0]!.evaluate(() => {
          return document.body.textContent!.trim();
        })
      ).toBe('');
      expect(
        await page.frames()[1]!.evaluate(() => {
          return document.body.textContent!.trim();
        })
      ).toBe(`Hi, I'm frame`);
    });
    it('should execute after cross-site navigation', async () => {
      const {page, server} = getTestState();

      await page.goto(server.EMPTY_PAGE);
      const mainFrame = page.mainFrame();
      expect(
        await mainFrame.evaluate(() => {
          return window.location.href;
        })
      ).toContain('localhost');
      await page.goto(server.CROSS_PROCESS_PREFIX + '/empty.html');
      expect(
        await mainFrame.evaluate(() => {
          return window.location.href;
        })
      ).toContain('127');
    });
  });
});