scandit-sdk/src/lib/barcodePickerCameraManager.spec.ts

Scandit Barcode Scanner SDK for the Web

/* tslint:disable:no-implicit-dependencies no-any */
/**
 * BarcodePickerCameraManager tests
 */
import test from "ava";
import * as sinon from "sinon";

import { Camera, CameraAccess } from "..";
import { BarcodePickerCameraManager, ExtendedMediaTrackCapabilities, MeteringMode } from "./barcodePickerCameraManager";
import { BarcodePickerGui } from "./barcodePickerGui";

Object.defineProperty(screen, "width", {
  writable: true
});
Object.defineProperty(screen, "height", {
  writable: true
});
(<any>screen).width = 100;
(<any>screen).height = 100;

const triggerFatalErrorSpy: sinon.SinonSpy = sinon.spy();

// Speed up times
(<any>BarcodePickerCameraManager).cameraAccessTimeoutMs /= 10;
(<any>BarcodePickerCameraManager).cameraMetadataCheckTimeoutMs /= 10;
(<any>BarcodePickerCameraManager).cameraMetadataCheckIntervalMs /= 10;
(<any>BarcodePickerCameraManager).getCapabilitiesTimeoutMs /= 10;
(<any>BarcodePickerCameraManager).autofocusIntervalMs /= 10;
(<any>BarcodePickerCameraManager).manualToAutofocusResumeTimeoutMs /= 10;
(<any>BarcodePickerCameraManager).manualFocusWaitTimeoutMs /= 10;

async function wait(ms: number): Promise<void> {
  return new Promise(resolve => {
    setTimeout(resolve, ms);
  });
}

function fakeGetCameras(cameraAmount: number, cameraTypes?: Camera.Type[], cameraLabels?: string[]): void {
  if ((<sinon.SinonSpy>CameraAccess.getCameras).restore != null) {
    (<sinon.SinonSpy>CameraAccess.getCameras).restore();
  }
  sinon.stub(CameraAccess, "getCameras").resolves(
    // tslint:disable-next-line:prefer-array-literal
    Array.from(Array(cameraAmount), (_, index) => {
      const cameraType: Camera.Type =
        cameraTypes == null || cameraTypes[index] == null ? Camera.Type.BACK : cameraTypes[index];
      const label: string =
        cameraLabels == null || cameraLabels[index] == null
          ? `Fake Camera Device (${cameraType})`
          : cameraLabels[index];

      return {
        deviceId: "unknown",
        groupId: "1",
        kind: "videoinput",
        label,
        cameraType
      };
    })
  );
}

function fakeAccessCameraStream(facingMode: string, mediaTrackCapabilities?: ExtendedMediaTrackCapabilities): void {
  if ((<sinon.SinonSpy>CameraAccess.accessCameraStream).restore != null) {
    (<sinon.SinonSpy>CameraAccess.accessCameraStream).restore();
  }
  sinon.stub(CameraAccess, "accessCameraStream").callsFake(() => {
    const mediaStreamTrack: MediaStreamTrack = <any>{
      stop: sinon.spy(),
      addEventListener: sinon.spy(),
      getSettings: () => {
        return {
          width: 640,
          height: 480,
          deviceId: "1",
          facingMode
        };
      },
      label: ""
    };

    if (mediaTrackCapabilities != null) {
      mediaStreamTrack.getCapabilities = () => {
        return mediaTrackCapabilities;
      };
    }

    return Promise.resolve(<any>{
      getTracks: () => {
        return [mediaStreamTrack];
      },
      getVideoTracks: () => {
        return [mediaStreamTrack];
      }
    });
  });
}

function fakeAccessCameraStreamFailure(error: Error): void {
  if ((<sinon.SinonSpy>CameraAccess.accessCameraStream).restore != null) {
    (<sinon.SinonSpy>CameraAccess.accessCameraStream).restore();
  }
  sinon.stub(CameraAccess, "accessCameraStream").rejects(error);
}

function fakeMediaStream(
  cameraManager: BarcodePickerCameraManager,
  mediaTrackCapabilities?: ExtendedMediaTrackCapabilities
): MediaStream {
  const mediaStreamTrack: MediaStreamTrack = <any>{
    constraints: {},
    stop: sinon.spy(),
    // tslint:disable-next-line:no-accessor-field-mismatch
    getConstraints(): MediaTrackConstraints {
      return this.constraints;
    },
    applyConstraints: sinon.stub().callsFake(
      (mediaTrackConstraints: MediaTrackConstraints): Promise<void> => {
        (<any>mediaStreamTrack).constraints = mediaTrackConstraints;

        return Promise.resolve();
      }
    )
  };

  if (mediaTrackCapabilities != null) {
    mediaStreamTrack.getCapabilities = () => {
      return mediaTrackCapabilities;
    };
  }
  const mediaStream: MediaStream = <any>{
    getVideoTracks: () => {
      return [mediaStreamTrack];
    }
  };
  (<any>cameraManager).mediaStream = mediaStream;
  (<any>cameraManager).storeStreamCapabilities();

  return mediaStream;
}

test("isCameraSwitcherEnabled & setCameraSwitcherEnabled", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));
  cameraManager.setInteractionOptions(false, false, false, false);
  t.false(cameraManager.isCameraSwitcherEnabled());
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 0);
  fakeGetCameras(1);
  await cameraManager.setCameraSwitcherEnabled(true);
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 0);
  fakeGetCameras(2);
  await cameraManager.setCameraSwitcherEnabled(true);
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 1);
  t.deepEqual(barcodePickerGui.setCameraSwitcherVisible.lastCall.args, [true]);
  t.true(cameraManager.isCameraSwitcherEnabled());
  await cameraManager.setCameraSwitcherEnabled(false);
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 2);
  t.deepEqual(barcodePickerGui.setCameraSwitcherVisible.lastCall.args, [false]);
  t.false(cameraManager.isCameraSwitcherEnabled());
});

test("isTorchToggleEnabled & setTorchToggleEnabled", t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));
  cameraManager.setInteractionOptions(false, false, false, false);
  t.false(cameraManager.isTorchToggleEnabled());
  t.is(barcodePickerGui.setTorchTogglerVisible.callCount, 0);
  cameraManager.setTorchToggleEnabled(true);
  t.is(barcodePickerGui.setTorchTogglerVisible.callCount, 0);
  fakeMediaStream(cameraManager, {
    torch: true
  });
  cameraManager.setTorchToggleEnabled(true);
  t.is(barcodePickerGui.setTorchTogglerVisible.callCount, 1);
  t.deepEqual(barcodePickerGui.setTorchTogglerVisible.lastCall.args, [true]);
  t.true(cameraManager.isTorchToggleEnabled());
  cameraManager.setTorchToggleEnabled(false);
  t.is(barcodePickerGui.setTorchTogglerVisible.callCount, 2);
  t.deepEqual(barcodePickerGui.setTorchTogglerVisible.lastCall.args, [false]);
  t.false(cameraManager.isTorchToggleEnabled());
});

test("isTapToFocusEnabled & setTapToFocusEnabled & isPinchToZoomEnabled & setPinchToZoomEnabled", t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const videoElementAddEventListener: sinon.SinonSpy = sinon.spy();
  const videoElementRemoveEventListener: sinon.SinonSpy = sinon.spy();
  (<any>barcodePickerGui).videoElement = {
    addEventListener: videoElementAddEventListener,
    removeEventListener: videoElementRemoveEventListener
  };
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));
  cameraManager.setInteractionOptions(false, false, false, false);

  t.false(cameraManager.isTapToFocusEnabled());
  t.false(cameraManager.isPinchToZoomEnabled());
  t.is(videoElementAddEventListener.callCount, 0);
  cameraManager.setTapToFocusEnabled(true);
  cameraManager.setPinchToZoomEnabled(true);
  t.is(videoElementAddEventListener.callCount, 0);
  fakeMediaStream(cameraManager);
  cameraManager.setTapToFocusEnabled(true);
  t.is(videoElementAddEventListener.callCount, 2);
  t.true(videoElementAddEventListener.calledWith("mousedown"));
  t.true(videoElementAddEventListener.calledWith("touchend"));
  cameraManager.setPinchToZoomEnabled(true);
  t.is(videoElementAddEventListener.callCount, 4);
  t.true(videoElementAddEventListener.calledWith("touchstart"));
  t.true(videoElementAddEventListener.calledWith("touchmove"));
  t.true(cameraManager.isTapToFocusEnabled());
  t.true(cameraManager.isPinchToZoomEnabled());
  t.is(videoElementRemoveEventListener.callCount, 0);
  cameraManager.setTapToFocusEnabled(false);
  t.is(videoElementRemoveEventListener.callCount, 2);
  t.true(videoElementRemoveEventListener.calledWith("mousedown"));
  t.true(videoElementRemoveEventListener.calledWith("touchend"));
  cameraManager.setPinchToZoomEnabled(false);
  t.is(videoElementRemoveEventListener.callCount, 4);
  t.true(videoElementRemoveEventListener.calledWith("touchstart"));
  t.true(videoElementRemoveEventListener.calledWith("touchmove"));
  t.false(cameraManager.isTapToFocusEnabled());
  t.false(cameraManager.isPinchToZoomEnabled());
});

test("setTorchEnabled & toggleTorch", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));

  await cameraManager.setTorchEnabled(true);

  const mediaTrackCapabilities: ExtendedMediaTrackCapabilities = {
    torch: true
  };
  const applyConstraintsStub: sinon.SinonStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  await cameraManager.setTorchEnabled(true);
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ torch: true }] }));
  await cameraManager.setTorchEnabled(false);
  t.true(applyConstraintsStub.calledTwice);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ torch: false }] }));
  applyConstraintsStub.resetHistory();
  await cameraManager.toggleTorch();
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ torch: true }] }));
  await cameraManager.toggleTorch();
  t.true(applyConstraintsStub.calledTwice);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ torch: false }] }));
});

test("setZoom", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));

  await cameraManager.setZoom(2);

  const mediaTrackCapabilities: ExtendedMediaTrackCapabilities = {
    zoom: {
      max: 9,
      min: 1,
      step: 0.1
    }
  };
  const applyConstraintsStub: sinon.SinonStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  await cameraManager.setZoom(0);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 1 }] }]);
  await cameraManager.setZoom(1);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 9 }] }]);
  await cameraManager.setZoom(0.5);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 5 }] }]);
  await cameraManager.setZoom(10);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 9 }] }]);
  await cameraManager.setZoom(0.25, 5);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 7 }] }]);
});

test("triggerZoomStart & triggerZoomMove", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));
  const touchStartEvent: any = {
    preventDefault: sinon.spy(),
    type: "touchstart"
  };
  const touchStart0xEvent: any = {
    ...touchStartEvent,
    touches: [
      {
        screenX: 0,
        screenY: 0
      },
      {
        screenX: 0,
        screenY: 0
      }
    ]
  };
  const touchStart25xEvent: any = {
    ...touchStartEvent,
    touches: [
      {
        screenX: 0,
        screenY: 0
      },
      {
        screenX: 25,
        screenY: 0
      }
    ]
  };
  const touchStart50xEvent: any = {
    ...touchStartEvent,
    touches: [
      {
        screenX: 0,
        screenY: 0
      },
      {
        screenX: 50,
        screenY: 0
      }
    ]
  };

  (<any>cameraManager).triggerZoomStart({
    ...touchStartEvent,
    touches: [1]
  });
  (<any>cameraManager).triggerZoomMove({
    ...touchStartEvent,
    touches: [1]
  });
  (<any>cameraManager).triggerZoomStart(touchStart25xEvent);

  const mediaTrackCapabilities: ExtendedMediaTrackCapabilities = {
    torch: true,
    zoom: {
      max: 9,
      min: 1,
      step: 0.1
    }
  };
  const applyConstraintsStub: sinon.SinonStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  (<any>cameraManager).triggerZoomStart(touchStart0xEvent);
  await cameraManager.setTorchEnabled(true);
  (<any>cameraManager).triggerZoomStart(touchStart0xEvent);
  (<any>cameraManager).triggerZoomMove(touchStart0xEvent);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 1 }] }]);
  (<any>cameraManager).triggerZoomMove(touchStart25xEvent);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 5 }] }]);
  (<any>cameraManager).triggerZoomMove(touchStart50xEvent);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 9 }] }]);
  (<any>cameraManager).triggerZoomStart(touchStart25xEvent);
  (<any>cameraManager).triggerZoomMove(touchStart0xEvent);
  t.deepEqual(applyConstraintsStub.lastCall.args, [{ advanced: [{ zoom: 5 }] }]);
});

// tslint:disable-next-line:max-func-body-length
test("manual / auto focus", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));

  (<any>cameraManager).triggerManualFocus({
    preventDefault: sinon.spy(),
    type: "touchend",
    touches: [1, 2]
  });

  (<any>cameraManager).pinchToZoomDistance = 1;
  (<any>cameraManager).triggerManualFocus({
    preventDefault: sinon.spy(),
    type: "mousedown"
  });

  (<any>cameraManager).triggerManualFocus({
    preventDefault: sinon.spy(),
    type: "touchend",
    touches: []
  });

  // Trigger manual focus when not supported
  let mediaTrackCapabilities: ExtendedMediaTrackCapabilities = {};
  let applyConstraintsStub: sinon.SinonStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  (<any>cameraManager).triggerManualFocus();
  t.true(applyConstraintsStub.notCalled);
  mediaTrackCapabilities = {
    focusMode: [MeteringMode.SINGLE_SHOT, MeteringMode.CONTINUOUS] // this is a weird mix
  };
  applyConstraintsStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  (<any>cameraManager).triggerManualFocus();
  t.true(applyConstraintsStub.notCalled);

  // Trigger manual focus when single-shot only is supported
  mediaTrackCapabilities = {
    focusMode: [MeteringMode.SINGLE_SHOT]
  };
  applyConstraintsStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  t.true(applyConstraintsStub.notCalled);
  (<any>cameraManager).triggerManualFocus();
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ focusMode: MeteringMode.SINGLE_SHOT }] }));

  // Enable background single-shot autofocus
  applyConstraintsStub.resetHistory();
  (<any>cameraManager).storeStreamCapabilities();
  (<any>cameraManager).setupAutofocus();
  await wait((<any>BarcodePickerCameraManager).autofocusIntervalMs * 4);
  t.true(applyConstraintsStub.callCount >= 2);
  t.true(applyConstraintsStub.alwaysCalledWith({ advanced: [{ focusMode: MeteringMode.SINGLE_SHOT }] }));
  // Trigger manual focus when single-shot only is supported (while background single-shot autofocus is active)
  (<any>cameraManager).triggerManualFocus();
  applyConstraintsStub.resetHistory();
  // Background single-shot autofocus should be disabled for a while
  await wait((<any>BarcodePickerCameraManager).autofocusIntervalMs * 2);
  t.true(applyConstraintsStub.notCalled);
  await wait((<any>BarcodePickerCameraManager).manualToAutofocusResumeTimeoutMs * 2);
  // Background single-shot autofocus should be enabled now
  t.true(applyConstraintsStub.called);
  t.true(applyConstraintsStub.alwaysCalledWith({ advanced: [{ focusMode: MeteringMode.SINGLE_SHOT }] }));
  cameraManager.stopStream();

  // Trigger manual focus when all focus modes are supported
  mediaTrackCapabilities = {
    focusMode: [MeteringMode.SINGLE_SHOT, MeteringMode.CONTINUOUS, MeteringMode.MANUAL]
  };
  applyConstraintsStub = <any>(
    fakeMediaStream(cameraManager, mediaTrackCapabilities).getVideoTracks()[0].applyConstraints
  );
  (<any>cameraManager).triggerManualFocus();
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ focusMode: MeteringMode.CONTINUOUS }] }));
  applyConstraintsStub.resetHistory();
  await wait((<any>BarcodePickerCameraManager).manualFocusWaitTimeoutMs * 2);
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ focusMode: MeteringMode.MANUAL }] }));
  applyConstraintsStub.resetHistory();
  await wait((<any>BarcodePickerCameraManager).manualToAutofocusResumeTimeoutMs * 2);
  t.true(applyConstraintsStub.calledOnce);
  t.true(applyConstraintsStub.calledWith({ advanced: [{ focusMode: MeteringMode.CONTINUOUS }] }));
});

// tslint:disable-next-line:max-func-body-length
test.serial("setupCameras", async t => {
  const barcodePickerGui: sinon.SinonStubbedInstance<BarcodePickerGui> = sinon.createStubInstance(BarcodePickerGui);
  const videoElementRemoveEventListener: sinon.SinonSpy = sinon.spy();
  (<any>barcodePickerGui).videoElement = {
    loadedmetadataEventListener: null,
    addEventListener(eventType: string, listener: (this: HTMLVideoElement, ev: Event) => any): void {
      if (eventType === "loadedmetadata") {
        this.loadedmetadataEventListener = listener;
      }
    },
    removeEventListener: videoElementRemoveEventListener,
    dispatchEvent: sinon.spy()
  };
  (<any>barcodePickerGui).videoElement.load = function(): void {
    this.loadedmetadataEventListener();
    this.videoWidth = 640;
    this.videoHeight = 480;
    this.currentTime = 0;
    this.onloadeddata();
    setTimeout(() => {
      this.currentTime = 1;
    }, (<any>BarcodePickerCameraManager).cameraMetadataCheckIntervalMs * 2);
  };
  const cameraManager: BarcodePickerCameraManager = new BarcodePickerCameraManager(triggerFatalErrorSpy, <
    BarcodePickerGui
  >(<unknown>barcodePickerGui));
  cameraManager.setInteractionOptions(true, true, true, true);
  t.true(cameraManager.isCameraSwitcherEnabled());
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 0);

  // Intentionally make optimistic initial back camera access fail
  fakeAccessCameraStream("user");
  fakeGetCameras(2, [Camera.Type.FRONT, Camera.Type.FRONT]);
  await cameraManager.setupCameras();
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 1);
  barcodePickerGui.setCameraSwitcherVisible.resetHistory();
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 2);
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);
  cameraManager.selectedCamera = undefined;
  fakeAccessCameraStream("user");
  fakeGetCameras(2, [Camera.Type.BACK, Camera.Type.FRONT]);
  await cameraManager.setupCameras();
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 1);
  barcodePickerGui.setCameraSwitcherVisible.resetHistory();
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 2);
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);
  cameraManager.selectedCamera = undefined;
  fakeAccessCameraStream("user");
  fakeGetCameras(0);
  let error: Error = await t.throwsAsync(cameraManager.setupCameras());
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 0);
  t.is(error.message, "No camera available");

  // Access primary back camera in common triple camera setups
  cameraManager.selectedCamera = undefined;
  fakeAccessCameraStream("user");
  fakeGetCameras(
    3,
    [Camera.Type.FRONT, Camera.Type.BACK, Camera.Type.BACK],
    ["", "camera2 2, facing back", "camera2 0, facing back"]
  );
  await cameraManager.setupCameras();
  t.not(cameraManager.selectedCamera, null);
  t.is((<Camera>(<unknown>cameraManager.selectedCamera)).label, "camera2 0, facing back");

  let mediaTrackCapabilities: ExtendedMediaTrackCapabilities = {
    torch: true
  };
  cameraManager.selectedCamera = undefined;
  fakeAccessCameraStream("environment", mediaTrackCapabilities);
  fakeGetCameras(1);
  barcodePickerGui.setCameraSwitcherVisible.resetHistory();
  await cameraManager.setupCameras();
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 0);
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 2);
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);
  await wait((<any>BarcodePickerCameraManager).getCapabilitiesTimeoutMs * 2);
  t.deepEqual((<any>cameraManager).mediaTrackCapabilities, mediaTrackCapabilities);

  mediaTrackCapabilities = {
    torch: false,
    focusMode: [MeteringMode.SINGLE_SHOT]
  };
  cameraManager.selectedCamera = undefined;
  fakeAccessCameraStream("environment", mediaTrackCapabilities);
  fakeGetCameras(2);
  await cameraManager.setupCameras();
  t.is(barcodePickerGui.setCameraSwitcherVisible.callCount, 1);
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 2);
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);
  await wait((<any>BarcodePickerCameraManager).getCapabilitiesTimeoutMs * 2);
  t.deepEqual((<any>cameraManager).mediaTrackCapabilities, mediaTrackCapabilities);

  (<any>barcodePickerGui).videoElement.load = function(): void {
    this.loadedmetadataEventListener();
    this.videoWidth = 640;
    this.videoHeight = 480;
    this.currentTime = 0;
    this.onloadeddata();
    // Intentionally never have valid metadata
  };
  error = await t.throwsAsync(cameraManager.setupCameras());
  t.is(error.message, "Could not initialize camera correctly");
  (<any>barcodePickerGui).videoElement.load = function(): void {
    this.loadedmetadataEventListener();
    // Intentionally never call onloadeddata()
  };
  error = await t.throwsAsync(cameraManager.setupCameras());
  t.is(error.message, "Could not initialize camera correctly");

  fakeAccessCameraStreamFailure(new Error("Test error 1"));
  fakeGetCameras(1);
  cameraManager.selectedCamera = undefined;
  error = await t.throwsAsync(cameraManager.setupCameras());
  t.is(error.message, "Test error 1");
  t.true(
    (<sinon.SinonSpy>CameraAccess.accessCameraStream)
      .getCall(0)
      .calledBefore((<sinon.SinonSpy>CameraAccess.getCameras).firstCall)
  );
  t.true(
    (<sinon.SinonSpy>CameraAccess.accessCameraStream)
      .getCall(4)
      .calledAfter((<sinon.SinonSpy>CameraAccess.getCameras).firstCall)
  );
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 8); // 2 times 4 calls (resolution fallbacks)
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);

  fakeAccessCameraStreamFailure(new Error("Test error 2"));
  fakeGetCameras(1);
  error = await t.throwsAsync(cameraManager.setupCameras());
  t.is(error.message, "Test error 2");
  t.true(
    (<sinon.SinonSpy>CameraAccess.accessCameraStream)
      .getCall(0)
      .calledAfter((<sinon.SinonSpy>CameraAccess.getCameras).firstCall)
  );
  t.is((<sinon.SinonSpy>CameraAccess.accessCameraStream).callCount, 4); // 1 time 4 calls (resolution fallbacks)
  t.is((<sinon.SinonSpy>CameraAccess.getCameras).callCount, 1);
});