Be able to extend an expectation after it's created

[melcher]

calling resource.expect creates an expectation, calling .with causes the expectation to pass/fail depending on those parameters, calling .with would chain the expected parameters so that each would need to pass.

  var expectation; // Instantiate it so it can be shared between calls
  beforeEach(function(){
    expectation = resource.expect('POST');
   // every it block now requires a post to happen
  });
  it("should expect a post", function(){
    // Fails because we don't click save
  });
  it("should succeed post happens with any parameters", function(){
      click('Create'); // succeeds with any parameters
  });
  context("with a name", function(){
    beforeEach(function(){
      expectation.with({name: 'Joey'}); // now requires the parameters {name: 'Joey'}
      fill('Name').with('Joey');
    });

    it("should send up the patient's name", function(){
      click('Create');
    });
    describe("with a phone number", function(){
      it("should send up the phone number", function(){
        fill('Phone number').with('415-555-1234');
        expectation.with({phone_number: '415-555-1234'});
        // Extends the expectation, now requires name: 'Joey' and phone_number:  '415-555-1234'
        click('Create');
      });
    });
  });
``