Test private provider methods in AngularJS with Jasmine. How would you test setDay? Thanks: http://www.yearofmoo.com/2013/09/advanced-testing-and-debugging-in-angularjs.html

angular-provider-test-example.js

angular.module('widget.providers', []).
	provider('day', function(){
		var day = '';
		return {
			setDay: function(current){
				day = current;
			},
			$get: function(){
				return {
					day: day + 'day'
				}
			}
		}
	});

describe('widget.providers', function(){
	beforeEach(function () {
		module('widget.providers');
	});

	describe("Day provider", function () {
		"use strict";
		it('Testing providers day method default', inject(function(day){
			expect(day.day).toBe('day');
		}));
	});

	describe("Day provider: setDay", function () {
		"use strict";
		beforeEach(function () {
			module(function(dayProvider){
				"use strict";
				dayProvider.setDay('Bilbo');
			});
		});
		it('Testing providers setDay method', inject(function(day){
			expect(day.day).toBe('Bilboday');
		}));
	});
});