angular-docs-cn/packages/zone.js/test/zone-spec/long-stack-trace-zone.spec.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {isBrowser, isIE, zoneSymbol} from '../../lib/common/utils';
import {ifEnvSupports, isSafari, isSupportSetErrorStack} from '../test-util';

const defineProperty = (Object as any)[zoneSymbol('defineProperty')] || Object.defineProperty;

describe(
    'longStackTraceZone', ifEnvSupports(isSupportSetErrorStack, function() {
      let log: Error[];
      let lstz: Zone;
      let longStackTraceZoneSpec = (Zone as any)['longStackTraceZoneSpec'];
      let defaultTimeout = jasmine.DEFAULT_TIMEOUT_INTERVAL;

      beforeEach(function() {
        lstz = Zone.current.fork(longStackTraceZoneSpec).fork({
          name: 'long-stack-trace-zone-test',
          onHandleError: (parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone,
                          error: any): boolean => {
            parentZoneDelegate.handleError(targetZone, error);
            log.push(error);
            return false;
          }
        });

        log = [];
        jasmine.DEFAULT_TIMEOUT_INTERVAL = 10000;
      });

      afterEach(function() { jasmine.DEFAULT_TIMEOUT_INTERVAL = defaultTimeout; });

      function expectElapsed(stack: string, expectedCount: number) {
        try {
          let actualCount = stack.split('_Elapsed_').length;
          if (actualCount !== expectedCount) {
            expect(actualCount).toEqual(expectedCount);
            console.log(stack);
          }
        } catch (e) {
          expect(e).toBe(null);
        }
      }

      it('should produce long stack traces', function(done) {
        lstz.run(function() {
          setTimeout(function() {
            setTimeout(function() {
              setTimeout(function() {
                expectElapsed(log[0].stack !, 3);
                done();
              }, 0);
              throw new Error('Hello');
            }, 0);
          }, 0);
        });
      });

      it('should produce long stack traces for optimized eventTask',
         ifEnvSupports(() => isBrowser, function() {
           lstz.run(function() {
             const button = document.createElement('button');
             const clickEvent = document.createEvent('Event');
             clickEvent.initEvent('click', true, true);
             document.body.appendChild(button);

             button.addEventListener('click', function() { expectElapsed(log[0].stack !, 1); });

             button.dispatchEvent(clickEvent);

             document.body.removeChild(button);
           });
         }));

      it('should not overwrite long stack traces data for different optimized eventTasks',
         ifEnvSupports(() => isBrowser, function() {
           lstz.run(function() {
             const button = document.createElement('button');
             const clickEvent = document.createEvent('Event');
             clickEvent.initEvent('click', true, true);
             document.body.appendChild(button);

             const div = document.createElement('div');
             const enterEvent = document.createEvent('Event');
             enterEvent.initEvent('mouseenter', true, true);
             document.body.appendChild(div);

             button.addEventListener('click', function() { throw new Error('clickError'); });

             div.addEventListener('mouseenter', function() { throw new Error('enterError'); });

             button.dispatchEvent(clickEvent);
             div.dispatchEvent(enterEvent);

             expect(log.length).toBe(2);
             if (!isSafari() && !isIE()) {
               expect(log[0].stack === log[1].stack).toBe(false);
             }

             document.body.removeChild(button);
             document.body.removeChild(div);
           });
         }));

      it('should produce a long stack trace even if stack setter throws', (done) => {
        let wasStackAssigned = false;
        let error = new Error('Expected error');
        defineProperty(error, 'stack', {
          configurable: false,
          get: () => 'someStackTrace',
          set: (v: any) => { throw new Error('no writes'); }
        });
        lstz.run(() => { setTimeout(() => { throw error; }); });
        setTimeout(() => {
          const e = log[0];
          expect((e as any).longStack).toBeTruthy();
          done();
        });
      });

      it('should produce long stack traces when has uncaught error in promise', function(done) {
        lstz.runGuarded(function() {
          setTimeout(function() {
            setTimeout(function() {
              let promise = new Promise(function(resolve, reject) {
                setTimeout(function() { reject(new Error('Hello Promise')); }, 0);
              });
              promise.then(function() { fail('should not get here'); });
              setTimeout(function() {
                expectElapsed(log[0].stack !, 5);
                done();
              }, 0);
            }, 0);
          }, 0);
        });
      });

      it('should produce long stack traces when handling error in promise', function(done) {
        lstz.runGuarded(function() {
          setTimeout(function() {
            setTimeout(function() {
              let promise = new Promise(function(resolve, reject) {
                setTimeout(function() {
                  try {
                    throw new Error('Hello Promise');
                  } catch (err) {
                    reject(err);
                  }
                }, 0);
              });
              promise.catch(function(error) {
                // should be able to get long stack trace
                const longStackFrames: string = longStackTraceZoneSpec.getLongStackTrace(error);
                expectElapsed(longStackFrames, 4);
                done();
              });
            }, 0);
          }, 0);
        });
      });

      it('should not produce long stack traces if Error.stackTraceLimit = 0', function(done) {
        const originalStackTraceLimit = Error.stackTraceLimit;
        lstz.run(function() {
          setTimeout(function() {
            setTimeout(function() {
              setTimeout(function() {
                if (log[0].stack) {
                  expectElapsed(log[0].stack !, 1);
                }
                Error.stackTraceLimit = originalStackTraceLimit;
                done();
              }, 0);
              Error.stackTraceLimit = 0;
              throw new Error('Hello');
            }, 0);
          }, 0);
        });
      });
    }));