hide_link_test.js

test("In-progress message visible once Deferred is resolved", function(){
  var deferred = $.Deferred();
  this.mock($.prototype).expects('hide')
    .withArgs(2000)
    .once()
    .returns(deferred);

  hideLink();
  // using our deferred will keep the status from updating
  QUnit.equal($('#hide-status').text(), 'Link hiding in-progress');
});

test("Finished message visible once Deferred is resolved", function(){
  // ... mocking deferred object after hide() call

  hideLink();
  
  // resolving our deferred will trigger finished message
  deferred.resolve();
  QUnit.equal($('#hide-status').text(), 'Link hiding finished' );
});