How to use the @scion/workbench-application-platform.api.parseMessageEnvelopeElseNull function in @scion/workbench-application-platform

it('should have a channel defined', () => {
    expect(parseMessageEnvelopeElseNull({message: {}})).toBeNull();
    expect(parseMessageEnvelopeElseNull({protocol: PROTOCOL, channel: null, message: {}})).toBeNull();
  });
});

it('must not be null or undefined', () => {
    expect(parseMessageEnvelopeElseNull(null)).toBeNull();
    expect(parseMessageEnvelopeElseNull(undefined)).toBeNull();
  });

it('must not be null or undefined', () => {
    expect(parseMessageEnvelopeElseNull(null)).toBeNull();
    expect(parseMessageEnvelopeElseNull(undefined)).toBeNull();
  });

it('must be an object', () => {
    expect(parseMessageEnvelopeElseNull('')).toBeNull();
    expect(parseMessageEnvelopeElseNull(true)).toBeNull();
    expect(parseMessageEnvelopeElseNull(42)).toBeNull();
    expect(parseMessageEnvelopeElseNull(() => {
    })).toBeNull();
  });

it('must be an object', () => {
    expect(parseMessageEnvelopeElseNull('')).toBeNull();
    expect(parseMessageEnvelopeElseNull(true)).toBeNull();
    expect(parseMessageEnvelopeElseNull(42)).toBeNull();
    expect(parseMessageEnvelopeElseNull(() => {
    })).toBeNull();
  });

it('must be an object', () => {
    expect(parseMessageEnvelopeElseNull('')).toBeNull();
    expect(parseMessageEnvelopeElseNull(true)).toBeNull();
    expect(parseMessageEnvelopeElseNull(42)).toBeNull();
    expect(parseMessageEnvelopeElseNull(() => {
    })).toBeNull();
  });

.subscribe((data: any) => {
        const envelope = parseMessageEnvelopeElseNull(data);
        if (!envelope) {
          return;
        }
        this._zone.run(() => this.dispatchMessageFromSite(envelope));
      });
  }