angular-docs-cn/packages/benchpress/test/metric/perflog_metric_spec.ts

/**
 * @license
 * Copyright Google LLC 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 {StaticProvider} from '@angular/core';
import {AsyncTestCompleter, beforeEach, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';

import {Injector, Metric, Options, PerfLogEvent, PerfLogFeatures, PerflogMetric, WebDriverExtension} from '../../index';
import {TraceEventFactory} from '../trace_event_factory';

(function() {
let commandLog: any[];
const eventFactory = new TraceEventFactory('timeline', 'pid0');

function createMetric(
    perfLogs: PerfLogEvent[], perfLogFeatures: PerfLogFeatures,
    {microMetrics, forceGc, captureFrames, receivedData, requestCount, ignoreNavigation}: {
      microMetrics?: {[key: string]: string},
      forceGc?: boolean,
      captureFrames?: boolean,
      receivedData?: boolean,
      requestCount?: boolean,
      ignoreNavigation?: boolean
    } = {}): Metric {
  commandLog = [];
  if (!perfLogFeatures) {
    perfLogFeatures =
        new PerfLogFeatures({render: true, gc: true, frameCapture: true, userTiming: true});
  }
  if (!microMetrics) {
    microMetrics = {};
  }
  const providers: StaticProvider[] = [
    Options.DEFAULT_PROVIDERS, PerflogMetric.PROVIDERS,
    {provide: Options.MICRO_METRICS, useValue: microMetrics}, {
      provide: PerflogMetric.SET_TIMEOUT,
      useValue: (fn: Function, millis: number) => {
        commandLog.push(['setTimeout', millis]);
        fn();
      },
    },
    {
      provide: WebDriverExtension,
      useValue: new MockDriverExtension(perfLogs, commandLog, perfLogFeatures)
    }
  ];
  if (forceGc != null) {
    providers.push({provide: Options.FORCE_GC, useValue: forceGc});
  }
  if (captureFrames != null) {
    providers.push({provide: Options.CAPTURE_FRAMES, useValue: captureFrames});
  }
  if (receivedData != null) {
    providers.push({provide: Options.RECEIVED_DATA, useValue: receivedData});
  }
  if (requestCount != null) {
    providers.push({provide: Options.REQUEST_COUNT, useValue: requestCount});
  }
  if (ignoreNavigation != null) {
    providers.push({provide: PerflogMetric.IGNORE_NAVIGATION, useValue: ignoreNavigation});
  }
  return Injector.create(providers).get(PerflogMetric);
}

describe('perflog metric', () => {
  function sortedKeys(stringMap: {[key: string]: any}) {
    const res: string[] = [];
    res.push(...Object.keys(stringMap));
    res.sort();
    return res;
  }

  it('should describe itself based on the perfLogFeatrues', () => {
    expect(sortedKeys(createMetric([[]], new PerfLogFeatures()).describe())).toEqual([
      'pureScriptTime', 'scriptTime'
    ]);

    expect(
        sortedKeys(createMetric([[]], new PerfLogFeatures({render: true, gc: false})).describe()))
        .toEqual(['pureScriptTime', 'renderTime', 'scriptTime']);

    expect(sortedKeys(createMetric([[]], null!).describe())).toEqual([
      'gcAmount', 'gcTime', 'majorGcTime', 'pureScriptTime', 'renderTime', 'scriptTime'
    ]);

    expect(sortedKeys(createMetric([[]], new PerfLogFeatures({render: true, gc: true}), {
                        forceGc: true
                      }).describe()))
        .toEqual([
          'forcedGcAmount', 'forcedGcTime', 'gcAmount', 'gcTime', 'majorGcTime', 'pureScriptTime',
          'renderTime', 'scriptTime'
        ]);


    expect(sortedKeys(createMetric([[]], new PerfLogFeatures({userTiming: true}), {
                        receivedData: true,
                        requestCount: true
                      }).describe()))
        .toEqual(['pureScriptTime', 'receivedData', 'requestCount', 'scriptTime']);
  });

  it('should describe itself based on micro metrics', () => {
    const description =
        createMetric([[]], null!, {microMetrics: {'myMicroMetric': 'someDesc'}}).describe();
    expect(description['myMicroMetric']).toEqual('someDesc');
  });

  it('should describe itself if frame capture is requested and available', () => {
    const description = createMetric([[]], new PerfLogFeatures({frameCapture: true}), {
                          captureFrames: true
                        }).describe();
    expect(description['frameTime.mean']).not.toContain('WARNING');
    expect(description['frameTime.best']).not.toContain('WARNING');
    expect(description['frameTime.worst']).not.toContain('WARNING');
    expect(description['frameTime.smooth']).not.toContain('WARNING');
  });

  it('should describe itself if frame capture is requested and not available', () => {
    const description = createMetric([[]], new PerfLogFeatures({frameCapture: false}), {
                          captureFrames: true
                        }).describe();
    expect(description['frameTime.mean']).toContain('WARNING');
    expect(description['frameTime.best']).toContain('WARNING');
    expect(description['frameTime.worst']).toContain('WARNING');
    expect(description['frameTime.smooth']).toContain('WARNING');
  });

  describe('beginMeasure', () => {
    it('should not force gc and mark the timeline',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const metric = createMetric([[]], null!);
         metric.beginMeasure().then((_) => {
           expect(commandLog).toEqual([['timeBegin', 'benchpress0']]);

           async.done();
         });
       }));

    it('should force gc and mark the timeline',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const metric = createMetric([[]], null!, {forceGc: true});
         metric.beginMeasure().then((_) => {
           expect(commandLog).toEqual([['gc'], ['timeBegin', 'benchpress0']]);

           async.done();
         });
       }));
  });

  describe('endMeasure', () => {
    it('should mark and aggregate events in between the marks',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [[
           eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 4),
           eventFactory.end('script', 6), eventFactory.markEnd('benchpress0', 10)
         ]];
         const metric = createMetric(events, null!);
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(commandLog).toEqual([
             ['timeBegin', 'benchpress0'], ['timeEnd', 'benchpress0', null], 'readPerfLog'
           ]);
           expect(data['scriptTime']).toBe(2);

           async.done();
         });
       }));

    it('should mark and aggregate events since navigationStart',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [[
           eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 4),
           eventFactory.end('script', 6), eventFactory.instant('navigationStart', 7),
           eventFactory.start('script', 8), eventFactory.end('script', 9),
           eventFactory.markEnd('benchpress0', 10)
         ]];
         const metric = createMetric(events, null!);
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(data['scriptTime']).toBe(1);

           async.done();
         });
       }));

    it('should ignore navigationStart if ignoreNavigation is set',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [[
           eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 4),
           eventFactory.end('script', 6), eventFactory.instant('navigationStart', 7),
           eventFactory.start('script', 8), eventFactory.end('script', 9),
           eventFactory.markEnd('benchpress0', 10)
         ]];
         const metric = createMetric(events, null!, {ignoreNavigation: true});
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(data['scriptTime']).toBe(3);

           async.done();
         });
       }));

    it('should restart timing', inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [
           [
             eventFactory.markStart('benchpress0', 0),
             eventFactory.markEnd('benchpress0', 1),
             eventFactory.markStart('benchpress1', 2),
           ],
           [eventFactory.markEnd('benchpress1', 3)]
         ];
         const metric = createMetric(events, null!);
         metric.beginMeasure()
             .then((_) => metric.endMeasure(true))
             .then((_) => metric.endMeasure(true))
             .then((_) => {
               expect(commandLog).toEqual([
                 ['timeBegin', 'benchpress0'], ['timeEnd', 'benchpress0', 'benchpress1'],
                 'readPerfLog', ['timeEnd', 'benchpress1', 'benchpress2'], 'readPerfLog'
               ]);

               async.done();
             });
       }));

    it('should loop and aggregate until the end mark is present',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [
           [eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 1)],
           [eventFactory.end('script', 2)],
           [
             eventFactory.start('script', 3), eventFactory.end('script', 5),
             eventFactory.markEnd('benchpress0', 10)
           ]
         ];
         const metric = createMetric(events, null!);
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(commandLog).toEqual([
             ['timeBegin', 'benchpress0'], ['timeEnd', 'benchpress0', null], 'readPerfLog',
             ['setTimeout', 100], 'readPerfLog', ['setTimeout', 100], 'readPerfLog'
           ]);
           expect(data['scriptTime']).toBe(3);

           async.done();
         });
       }));

    it('should store events after the end mark for the next call',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const events = [
           [
             eventFactory.markStart('benchpress0', 0), eventFactory.markEnd('benchpress0', 1),
             eventFactory.markStart('benchpress1', 1), eventFactory.start('script', 1),
             eventFactory.end('script', 2)
           ],
           [
             eventFactory.start('script', 3), eventFactory.end('script', 5),
             eventFactory.markEnd('benchpress1', 6)
           ]
         ];
         const metric = createMetric(events, null!);
         metric.beginMeasure()
             .then((_) => metric.endMeasure(true))
             .then((data) => {
               expect(data['scriptTime']).toBe(0);
               return metric.endMeasure(true);
             })
             .then((data) => {
               expect(commandLog).toEqual([
                 ['timeBegin', 'benchpress0'], ['timeEnd', 'benchpress0', 'benchpress1'],
                 'readPerfLog', ['timeEnd', 'benchpress1', 'benchpress2'], 'readPerfLog'
               ]);
               expect(data['scriptTime']).toBe(3);

               async.done();
             });
       }));

    describe('with forced gc', () => {
      let events: PerfLogEvent[][];
      beforeEach(() => {
        events = [[
          eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 4),
          eventFactory.end('script', 6), eventFactory.markEnd('benchpress0', 10),
          eventFactory.markStart('benchpress1', 11),
          eventFactory.start('gc', 12, {'usedHeapSize': 2500}),
          eventFactory.end('gc', 15, {'usedHeapSize': 1000}),
          eventFactory.markEnd('benchpress1', 20)
        ]];
      });

      it('should measure forced gc', inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           const metric = createMetric(events, null!, {forceGc: true});
           metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
             expect(commandLog).toEqual([
               ['gc'], ['timeBegin', 'benchpress0'], ['timeEnd', 'benchpress0', 'benchpress1'],
               'readPerfLog', ['gc'], ['timeEnd', 'benchpress1', null], 'readPerfLog'
             ]);
             expect(data['forcedGcTime']).toBe(3);
             expect(data['forcedGcAmount']).toBe(1.5);

             async.done();
           });
         }));

      it('should restart after the forced gc if needed',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           const metric = createMetric(events, null!, {forceGc: true});
           metric.beginMeasure().then((_) => metric.endMeasure(true)).then((data) => {
             expect(commandLog[5]).toEqual(['timeEnd', 'benchpress1', 'benchpress2']);

             async.done();
           });
         }));
    });
  });

  describe('aggregation', () => {
    function aggregate(events: any[], {microMetrics, captureFrames, receivedData, requestCount}: {
      microMetrics?: {[key: string]: string},
      captureFrames?: boolean,
      receivedData?: boolean,
      requestCount?: boolean
    } = {}) {
      events.unshift(eventFactory.markStart('benchpress0', 0));
      events.push(eventFactory.markEnd('benchpress0', 10));
      const metric = createMetric([events], null!, {
        microMetrics: microMetrics,
        captureFrames: captureFrames,
        receivedData: receivedData,
        requestCount: requestCount
      });
      return metric.beginMeasure().then((_) => metric.endMeasure(false));
    }

    describe('frame metrics', () => {
      it('should calculate mean frame time',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('frameCapture', 0), eventFactory.instant('frame', 1),
                 eventFactory.instant('frame', 3), eventFactory.instant('frame', 4),
                 eventFactory.markEnd('frameCapture', 5)
               ],
               {captureFrames: true})
               .then((data) => {
                 expect(data['frameTime.mean']).toBe(((3 - 1) + (4 - 3)) / 2);
                 async.done();
               });
         }));

      it('should throw if no start event',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate([eventFactory.instant('frame', 4), eventFactory.markEnd('frameCapture', 5)], {
             captureFrames: true
           }).catch((err): any => {
             expect(() => {
               throw err;
             }).toThrowError('missing start event for frame capture');
             async.done();
           });
         }));

      it('should throw if no end event',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [eventFactory.markStart('frameCapture', 3), eventFactory.instant('frame', 4)],
               {captureFrames: true})
               .catch((err): any => {
                 expect(() => {
                   throw err;
                 }).toThrowError('missing end event for frame capture');
                 async.done();
               });
         }));

      it('should throw if trying to capture twice',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('frameCapture', 3),
                 eventFactory.markStart('frameCapture', 4)
               ],
               {captureFrames: true})
               .catch((err): any => {
                 expect(() => {
                   throw err;
                 }).toThrowError('can capture frames only once per benchmark run');
                 async.done();
               });
         }));

      it('should throw if trying to capture when frame capture is disabled',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate([eventFactory.markStart('frameCapture', 3)]).catch((err) => {
             expect(() => {
               throw err;
             })
                 .toThrowError(
                     'found start event for frame capture, but frame capture was not requested in benchpress');
             async.done();
             return null;
           });
         }));

      it('should throw if frame capture is enabled, but nothing is captured',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate([], {captureFrames: true}).catch((err): any => {
             expect(() => {
               throw err;
             }).toThrowError('frame capture requested in benchpress, but no start event was found');
             async.done();
           });
         }));

      it('should calculate best and worst frame time',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('frameCapture', 0), eventFactory.instant('frame', 1),
                 eventFactory.instant('frame', 9), eventFactory.instant('frame', 15),
                 eventFactory.instant('frame', 18), eventFactory.instant('frame', 28),
                 eventFactory.instant('frame', 32), eventFactory.markEnd('frameCapture', 10)
               ],
               {captureFrames: true})
               .then((data) => {
                 expect(data['frameTime.worst']).toBe(10);
                 expect(data['frameTime.best']).toBe(3);
                 async.done();
               });
         }));

      it('should calculate percentage of smoothness to be good',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('frameCapture', 0), eventFactory.instant('frame', 1),
                 eventFactory.instant('frame', 2), eventFactory.instant('frame', 3),
                 eventFactory.markEnd('frameCapture', 4)
               ],
               {captureFrames: true})
               .then((data) => {
                 expect(data['frameTime.smooth']).toBe(1.0);
                 async.done();
               });
         }));

      it('should calculate percentage of smoothness to be bad',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('frameCapture', 0), eventFactory.instant('frame', 1),
                 eventFactory.instant('frame', 2), eventFactory.instant('frame', 22),
                 eventFactory.instant('frame', 23), eventFactory.instant('frame', 24),
                 eventFactory.markEnd('frameCapture', 4)
               ],
               {captureFrames: true})
               .then((data) => {
                 expect(data['frameTime.smooth']).toBe(0.75);
                 async.done();
               });
         }));
    });

    it('should report a single interval',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('script', 0), eventFactory.end('script', 5)
         ]).then((data) => {
           expect(data['scriptTime']).toBe(5);
           async.done();
         });
       }));

    it('should sum up multiple intervals',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('script', 0), eventFactory.end('script', 5),
           eventFactory.start('script', 10), eventFactory.end('script', 17)
         ]).then((data) => {
           expect(data['scriptTime']).toBe(12);
           async.done();
         });
       }));

    it('should ignore not started intervals',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([eventFactory.end('script', 10)]).then((data) => {
           expect(data['scriptTime']).toBe(0);
           async.done();
         });
       }));

    it('should ignore not ended intervals',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([eventFactory.start('script', 10)]).then((data) => {
           expect(data['scriptTime']).toBe(0);
           async.done();
         });
       }));

    it('should ignore nested intervals',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('script', 0), eventFactory.start('script', 5),
           eventFactory.end('script', 10), eventFactory.end('script', 17)
         ]).then((data) => {
           expect(data['scriptTime']).toBe(17);
           async.done();
         });
       }));

    it('should ignore events from different processed as the start mark',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const otherProcessEventFactory = new TraceEventFactory('timeline', 'pid1');
         const metric = createMetric(
             [[
               eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 0, null),
               eventFactory.end('script', 5, null),
               otherProcessEventFactory.start('script', 10, null),
               otherProcessEventFactory.end('script', 17, null),
               eventFactory.markEnd('benchpress0', 20)
             ]],
             null!);
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(data['scriptTime']).toBe(5);
           async.done();
         });
       }));

    it('should mark a run as invalid if the start and end marks are different',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         const otherProcessEventFactory = new TraceEventFactory('timeline', 'pid1');
         const metric = createMetric(
             [[
               eventFactory.markStart('benchpress0', 0), eventFactory.start('script', 0, null),
               eventFactory.end('script', 5, null),
               otherProcessEventFactory.start('script', 10, null),
               otherProcessEventFactory.end('script', 17, null),
               otherProcessEventFactory.markEnd('benchpress0', 20)
             ]],
             null!);
         metric.beginMeasure().then((_) => metric.endMeasure(false)).then((data) => {
           expect(data['invalid']).toBe(1);
           async.done();
         });
       }));

    it('should support scriptTime metric',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('script', 0), eventFactory.end('script', 5)
         ]).then((data) => {
           expect(data['scriptTime']).toBe(5);
           async.done();
         });
       }));

    it('should support renderTime metric',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('render', 0), eventFactory.end('render', 5)
         ]).then((data) => {
           expect(data['renderTime']).toBe(5);
           async.done();
         });
       }));

    it('should support gcTime/gcAmount metric',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('gc', 0, {'usedHeapSize': 2500}),
           eventFactory.end('gc', 5, {'usedHeapSize': 1000})
         ]).then((data) => {
           expect(data['gcTime']).toBe(5);
           expect(data['gcAmount']).toBe(1.5);
           expect(data['majorGcTime']).toBe(0);
           async.done();
         });
       }));

    it('should support majorGcTime metric',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('gc', 0, {'usedHeapSize': 2500}),
           eventFactory.end('gc', 5, {'usedHeapSize': 1000, 'majorGc': true})
         ]).then((data) => {
           expect(data['gcTime']).toBe(5);
           expect(data['majorGcTime']).toBe(5);
           async.done();
         });
       }));

    it('should support pureScriptTime = scriptTime-gcTime-renderTime',
       inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
         aggregate([
           eventFactory.start('script', 0), eventFactory.start('gc', 1, {'usedHeapSize': 1000}),
           eventFactory.end('gc', 4, {'usedHeapSize': 0}), eventFactory.start('render', 4),
           eventFactory.end('render', 5), eventFactory.end('script', 6)
         ]).then((data) => {
           expect(data['scriptTime']).toBe(6);
           expect(data['pureScriptTime']).toBe(2);
           async.done();
         });
       }));

    describe('receivedData', () => {
      it('should report received data since last navigationStart',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.instant('receivedData', 0, {'encodedDataLength': 1}),
                 eventFactory.instant('navigationStart', 1),
                 eventFactory.instant('receivedData', 2, {'encodedDataLength': 2}),
                 eventFactory.instant('navigationStart', 3),
                 eventFactory.instant('receivedData', 4, {'encodedDataLength': 4}),
                 eventFactory.instant('receivedData', 5, {'encodedDataLength': 8})
               ],
               {receivedData: true})
               .then((data) => {
                 expect(data['receivedData']).toBe(12);
                 async.done();
               });
         }));
    });

    describe('requestCount', () => {
      it('should report count of requests sent since last navigationStart',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.instant('sendRequest', 0), eventFactory.instant('navigationStart', 1),
                 eventFactory.instant('sendRequest', 2), eventFactory.instant('navigationStart', 3),
                 eventFactory.instant('sendRequest', 4), eventFactory.instant('sendRequest', 5)
               ],
               {requestCount: true})
               .then((data) => {
                 expect(data['requestCount']).toBe(2);
                 async.done();
               });
         }));
    });

    describe('microMetrics', () => {
      it('should report micro metrics',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('mm1', 0),
                 eventFactory.markEnd('mm1', 5),
               ],
               {microMetrics: {'mm1': 'micro metric 1'}})
               .then((data) => {
                 expect(data['mm1']).toBe(5.0);
                 async.done();
               });
         }));

      it('should ignore micro metrics that were not specified',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate([
             eventFactory.markStart('mm1', 0),
             eventFactory.markEnd('mm1', 5),
           ]).then((data) => {
             expect(data['mm1']).toBeFalsy();
             async.done();
           });
         }));

      it('should report micro metric averages',
         inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
           aggregate(
               [
                 eventFactory.markStart('mm1*20', 0),
                 eventFactory.markEnd('mm1*20', 5),
               ],
               {microMetrics: {'mm1': 'micro metric 1'}})
               .then((data) => {
                 expect(data['mm1']).toBe(5 / 20);
                 async.done();
               });
         }));
    });
  });
});
})();

class MockDriverExtension extends WebDriverExtension {
  constructor(
      private _perfLogs: any[], private _commandLog: any[],
      private _perfLogFeatures: PerfLogFeatures) {
    super();
  }

  timeBegin(name: string): Promise<any> {
    this._commandLog.push(['timeBegin', name]);
    return Promise.resolve(null);
  }

  timeEnd(name: string, restartName: string|null): Promise<any> {
    this._commandLog.push(['timeEnd', name, restartName]);
    return Promise.resolve(null);
  }

  perfLogFeatures(): PerfLogFeatures {
    return this._perfLogFeatures;
  }

  readPerfLog(): Promise<any> {
    this._commandLog.push('readPerfLog');
    if (this._perfLogs.length > 0) {
      const next = this._perfLogs[0];
      this._perfLogs.shift();
      return Promise.resolve(next);
    } else {
      return Promise.resolve([]);
    }
  }

  gc(): Promise<any> {
    this._commandLog.push(['gc']);
    return Promise.resolve(null);
  }
}