In the following spots a "MouseUp" eventName is being used, which does look inconsistent considering that the "Mouse Down"/"Mouse Enter"/"Mouse Exit" eventNames all have a space in them.
Is this inconsistency actually expected, or is it a simple typo? If the former, then a comment explaining *why* would be appropriate; otherwise we should just fix this :-)

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L806

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L945

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1034

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1168

/cc @calixteman 
xref,
          pupRef,
          pdfManagerMock,
          idFactoryMock
        ).then(({ data }) => {
          expect(data.title).toEqual("Correct Title");
          expect(data.contents).toEqual("Correct Text");
          expect(data.modificationDate).toEqual("D:20190423");
          expect(data.color).toEqual(new Uint8ClampedArray([0, 0, 255]));
          done();
        }, done.fail);
      }
    );
  });
  describe("InkAnnotation", function () {
    it("should handle a single ink list", function (done) {
      const inkDict = new Dict();
      inkDict.set("Type", Name.get("Annot"));
      inkDict.set("Subtype", Name.get("Ink"));
      inkDict.set("InkList", [[1, 1, 1, 2, 2, 2, 3, 3]]);
      const inkRef = Ref.get(142, 0);
      const xref = new XRefMock([{ ref: inkRef, data: inkDict }]);
      AnnotationFactory.create(
        xref,
        inkRef,
        pdfManagerMock,
        idFactoryMock
      ).then(({ data }) => {
        expect(data.annotationType).toEqual(AnnotationType.INK);
        expect(data.inkLists.length).toEqual(1);