[FireVolkhov]

Возможно тебе поможет вот такой примерчик

describe('Test', function(){

	var $ = angular.element,
		$compile,
		$rootScope;

	beforeEach(module('pascalprecht.translate', function ($translateProvider) {
		$translateProvider
			.translations('en', {
				'TRANSLATION_ID_3': 'Lorem Ipsum {{value + value}}'
			})
			.preferredLanguage('en');
	}));
	
	beforeEach(inject(function(_$compile_, _$rootScope_){
		$compile = _$compile_;
		$rootScope = _$rootScope_;
	} ) );

	describe('custom', function(){

		var elem, $scope;

		beforeEach(function(){
			elem = $("<div>{{STR | translate: '{val:demo.count}' }}</div>");
			$scope = $rootScope.new();
			$compile(elem)($scope);
			$scope.$digest();
		});

		afterEach(function(){
		    $scope.destroy();
		});

		it('to do ...', function(){
			$scope.STR = 'TRANSLATION_ID_3';
			$scope.demo = {
				count: '3'
			};
			$scope.$digest();
			expect(elem[0].innerText).toBe('Lorem Ipsum 33');
		});
	});
});