Angular $scope property undefined - angularjs

Question

I'm trying to set the $scope.sang property to an instance of SangService in a directive. Problem is, it doesn't appear to be getting set.
The Setup
sang-player.directive.js:
angular.module('sang').directive('sangPlayer', [
'SangService',
function(SangService) {
return {
restrict: 'EA',
scope: true,
link: function(scope, _elem, attr) {
window.console.log('link');
scope.sang = SangService.$new();
}
};
}]);
sang-player.directive.spec.js:
describe('The Sang Directive', function() {
var compile, scope, element, sang;
beforeEach(function() {
sang = jasmine.createSpyObj('sang',
['play', 'pause', 'playPause', 'previous', 'next', 'seek']);
module(function($provide) {
$provide.value('Sang', sang);
});
inject(function($compile, $rootScope) {
compile = $compile;
scope = $rootScope.$new();
element = getCompiledElement();
});
});
function getCompiledElement() {
var element = angular.element('<div sang-player></div>');
var compiledElement = compile(element)(scope);
scope.$digest();
return compiledElement;
}
it('creates a scope.sang object', function() {
expect(scope.sang).toBeDefined();
expect(typeof scope.sang).toBe('object');
});
});
Output from failed Jasmine spec run:
The Sang Directive
X creates a scope.sang object
Expected undefined to be defined. (1)
Expected 'undefined' to be 'object'. (2)
Not sure why there's no output from the link callback. I would expect this to get called within compile(element)(scope) or scope.$digest().
The Deets
Angular 1.4.1
Jasmine 2.4.1
grunt-contrib-jasmine 0.9.1
The full project repo lives here if you want to tinker.