问Angular和karma (jasmine)：如何按类查找元素

EN

beforeEach(function () {

    html = '<div class="dropdown">'+
              '<div class="trigger" >trigger</div>'+
              '<div class="dropdown">body</div>'+
           '<div>';

    inject(function ($compile, $rootScope) {

        scope    = $rootScope.$new();
        element  = angular.element(html);
        compiled = $compile(element);

        compiled(scope);
        scope.$digest();

        // HERE NOT WORKING
        var trigger == element.find('div.trigger');
        var dropdown == element.find('.dropdown');

        // trigger and dropdown have both length 0

    });

    // Test doesn't pass
    it('should find the right element'), function () {
        expect(trigger.hasClass('trigger')).toBe(true);
    }

});

var trigger == element.find('div.trigger') // doesn't find anything.

var triggers = element.find('div') // return an array of length 2.
var trigger = triggers[0];