Example of stubbing a complex object

tests.js

describe('something', function() {
  beforeEach(function() {
    this.getAttributeStub = sinon.stub(Xrm.Page, 'getAttribute');    
  });
  
  afterEach(function() {
    this.getAttributeStub.restore();
  });
  
  it('tests something', function() {
    this.getAttributeStub.withArgs('name').returns({
      getValue: function() { return 'something'; }
    });
    
    //test code here
  });
});