创建一个身份矩阵

我必须按照以下方式创建一个Identity矩阵，

“您的Matrix对象应具有不带任何参数的'createIdentity'函数。该函数应返回一个新构造的Matrix对象，该对象的单元格设置为一个单位矩阵。此函数的作用类似于C＃中的静态方法。您的JavaScript对象，请不要将函数添加到Matrix原型，而应直接添加到Matrix对象。（例如Matrix.createIdentity = function（）{等。）”

到目前为止，我所做的是：

var Matrix = (function () {
function Matrix(pX0, pX1, pX2, pY0, pY1, pY2, pZ0, pZ1, pZ2) {

    this.matrix = [
        [pX0, pX1, pX2],
        [pY0, pY1, pY2],
        [pZ0, pZ1, pZ2]
    ];
}
Matrix.prototype.getX0 = function () {
    return this.mX0;
};
Matrix.prototype.setX0 = function (pX0) {
    this.mX0 = pX0;
};
Matrix.prototype.getX1 = function () {
    return this.mX1;
};
Matrix.prototype.setX1 = function (pX1) {
    this.mX1 = pX1;
};
Matrix.prototype.getX2 = function () {
    return this.mX2;
};
Matrix.prototype.setX2 = function (pX2) {
    this.mX2 = pX2;
};


Matrix.prototype.getY0 = function () {
    return this.mY0;
};
Matrix.prototype.setY0 = function (pY0) {
    this.mY0 = pY0;
};
Matrix.prototype.getY1 = function () {
    return this.mY1;
};
Matrix.prototype.setY1 = function (pY1) {
    this.mY1 = pY1;
};
Matrix.prototype.getY2 = function () {
    return this.mY2;
};
Matrix.prototype.setY2 = function (pY2) {
    this.mY2 = pY2;
};


Matrix.prototype.getZ0 = function () {
    return this.mZ0;
};
Matrix.prototype.setZ0 = function (pZ0) {
    this.mZ0 = pZ0;
};
Matrix.prototype.getZ1 = function () {
    return this.mZ0;
};
Matrix.prototype.setZ1 = function (pZ1) {
    this.mZ1 = pZ1;
};
Matrix.prototype.getZ2 = function () {
    return this.mZ2;
};
Matrix.prototype.setZ2 = function (pZ2) {
    this.mZ2 = pZ2;
};
Matrix.prototype.getElement = function (pRow, pColumn) {
    return this.matrix[pRow][pColumn];
};

 Matrix.createIdentity = function () {

    var Test = new Matrix(1, 0, 0, 0, 1, 0, 0, 0, 1);
    Test = [
        [1, 0, 0],
        [0, 1, 0],
        [0, 0, 1]
    ];
    return new Test();

};
//Matrix.createIdentity = function () {

//    this.Matrix = [
//        [this.Matrix.setX0(1), this.Matrix.setX1(0), this.Matrix.setX2(0)],
//        [this.Matrix.setY0(0), this.Matrix.setY1(1), this.Matrix.setY2(0)],
//        [this.Matrix.setZ0(0), this.Matrix.setZ1(0), this.Matrix.setZ2(1)]
//    ];
//    return new Matrix();

//};

这是它必须通过的测试，该测试在茉莉花中：

describe("Create Identity", function () {
    var matrix = Matrix.createIdentity();
    it("Element (0,0) Set", function () {
        expect(matrix.getElement(0, 0)).toEqual(1);
    });

    it("Element (0,1) Set", function () {
        expect(matrix.getElement(0, 1)).toEqual(0);
    });

    it("Element (0,2) Set", function () {
        expect(matrix.getElement(0, 2)).toEqual(0);
    });

    it("Element (1,0) Set", function () {
        expect(matrix.getElement(1, 0)).toEqual(0);
    });

    it("Element (1,1) Set", function () {
        expect(matrix.getElement(1, 1)).toEqual(1);
    });

    it("Element (1,2) Set", function () {
        expect(matrix.getElement(1, 2)).toEqual(0);
    });

    it("Element (2,0) Set", function () {
        expect(matrix.getElement(2, 0)).toEqual(0);
    });

    it("Element (2,1) Set", function () {
        expect(matrix.getElement(2, 1)).toEqual(0);
    });

    it("Element (2,2) Set", function () {
        expect(matrix.getElement(2, 2)).toEqual(1);
    });

});

我看不到我如何不满足给出的描述的要求。我尝试了几种方法通过测试，但我似乎无法通过测试。我究竟做错了什么？