I'm having trouble testing 2 modules that have methods which return promises. When I chain the calls together and test if the methods have been called, only 1 out of the 2 were called. The second nested method is never called according to Q. However, both resolved values are logged and inspecting the method within the callback reveals that it ha…

unit-testing.js

Q = require('q');
sinon = require('sinon')
sinonChai = require('sinon-chai');
chai.use(sinonChai);
sinon.should()

describe('testing promises', function() {
  var aDeferred, bDeferred, moduleA, moduleB;
  
  aDeferred = Q.defer();
  bDeferred = Q.defer();
  
  moduleA = {
    asyncMethodA: function() {
      return aDeferred.promise;
    }
  };
  
  moduleB = {
    asyncMethodB: function() {
      return bDeferred.promise;
    }
  };
  
  it('should pass', function() {
    sinon.spy(moduleA, 'asyncMethodA');
    sinon.spy(moduleB, 'asyncMethodB');
    
    aDeferred.resolve('fooResolve');
    bDeferred.resolve('barResolve');
    
    moduleA.asyncMethodA('foo').then(function(value) {
      var promise;
      console.log(value);
      promise = moduleB.asyncMethodB('bar');
      moduleB.asyncMethodB.should.have.been.called;
      return promise;
    }).then(function(value) {
      return console.log(value);
    }).fail(function(err) {
      return console.log(err);
    });
    
    moduleA.asyncMethodA.should.have.been.called;
    moduleB.asyncMethodB.should.have.been.called;
    
    // FAIL: expected asyncMethodB to have been called at least once, but it was never called
    
  });
});