angularjs#5480-tests-suggestions.js

describe('nulls in expressions', function() {
  var props = ['b', 'c', 'd'];
  var contexts = [
    { 'b': null },
    { 'b': { 'c': null } },
    { 'b': { 'c': { 'd': null } } }
  ];
  forEach(props, function (prop, index) {
    var expr = props.slice(0, index+1).join('.');
    forEach(contexts, function (a, expectIndex) {
      expectIndex = parseInt(expectIndex, 10);
      if (index < expectIndex) { // will be an object
        it('blabla', inject(function($rootScope) {
          $rootScope.a = a;
          expect(typeof $rootScope.$eval('a.' + expr)).toBe('object');

          $rootScope.a = valueFn(a);
          expect(typeof $rootScope.$eval('a().' + expr)).toBe('object');
        }));
      } else {
        var result = (index == expectIndex ? null : undefined);
        it('blabla', inject(function($rootScope) {
          $rootScope.a = a;
          expect($rootScope.$eval('a.' + expr)).toBe(result);

          $rootScope.a = valueFn(a);
          expect($rootScope.$eval('a().' + expr)).toBe(result);
        }));
      }
    });
  });
});