describe ("isSymmetric(arr)", function () {
    it("should return true for [1, 2, 3, 3, 2, 1]", function() {
        let symmetric = isSymmetric([1, 2, 3, 3, 2, 1]);
        expect(symmetric([1, 2, 3, 3, 2, 1])).to.be.equal(true);
    });
    it("should return true for [-1, 2, -1]", function() {
        let symmetric = isSymmetric([-1, 2, -1]);
        expect(symmetric).to.be.equal(true);
    });
    it("should return false for [1, 2]", function() {
        let symmetric = isSymmetric([1, 2]);
        expect(symmetric).to.be.equal(false);
    });
    it("should return false for [1, 2, 3, 4, 2, 1]", function() {
        let symmetric = isSymmetric([1, 2, 3, 4, 2, 1]);
        expect(symmetric).to.be.equal(false);
    });
    it("should return false for [-1, 2, 1]", function() {
        let symmetric = isSymmetric([-1, 2, 1]);
        expect(symmetric).to.be.equal(false);
    });
    it("should return true for [1]", function() {
        let symmetric = isSymmetric([1]);
        expect(symmetric).to.be.equal(true);
    });
    it("should return true for [5, 'hi', {a:5}, new Date(), {a:5}, 'hi', 5]", function() {
        let symmetric = isSymmetric([5, 'hi', {a:5}, new Date(), {a:5}, 'hi', 5]);
        expect(symmetric).to.be.equal(true);
    });
    it("should return false for [5, 'hi', {a:5}, new Date(), {X:5}, 'hi', 5]", function() {
        let symmetric = isSymmetric([5, 'hi', {a:5}, new Date(), {X:5}, 'hi', 5]);
        expect(symmetric).to.be.equal(false);
    });
    it("should return false for 1,2,2,1", function() {
        let symmetric = isSymmetric(1,2,2,1);
        expect(symmetric).to.be.equal(false);
    });
    it("should return true for []", function() {
        let symmetric = isSymmetric([]);
        expect(symmetric).to.be.equal(true);
    });
});