Mocking $mdSideNav in unit test - angularjs

Question

I have a simple enough function that closes an $mdSidenav instance in my application
function closeSideNav() {
$mdSidenav('left').close();
}
I'm now needing to unit test this, but am having trouble writing an expectation for the close() call on $mdSidenav.
I thought about using $provide in my test spec
module(function($provide) {
$provide.value('$mdSidenav', function(id) {
return {
close: jasmine.createSpy('$mdSidenav.close')
}
})
});
beforeEach(inject(function(_$controller_, _$mdSidenav_) {
$controller = _$controller_;
$mdSidenav = _$mdSidenav_;
}));
beforeEach(function() {
vm = $controller('NavbarController', {
$mdSidenav: $mdSidenav
});
});
describe('vm.closeSideNav', function() {
beforeEach(function() {
spyOn($mdSidenav, 'close');
vm.closeSideNav()
});
it('should call $mdSidenav.close()', function() {
expect($mdSidenav.close).toHaveBeenCalled();
});
});
This throws a couple of errors:
Error: close() method does not exist
Error: Expected a spy, but got undefined.
Has anyone managed to mock out $mdSidenav and offer me some guidance please?
Thanks
UPDATE
Based on the suggested answer, I have now updated my test spec to
'use strict';
describe('NavbarController', function() {
var $controller,
vm,
$mdSidenav,
sideNavCloseMock;
beforeEach(function() {
module('app.layout');
sideNavCloseMock = jasmine.createSpy();
module(function($provide) {
$provide.value('$mdSidenav', function() {
return function(sideNavId) {
return {close: sideNavCloseMock}
}
})
});
});
beforeEach(inject(function(_$controller_, _$mdSidenav_) {
$controller = _$controller_;
$mdSidenav = _$mdSidenav_;
}));
beforeEach(function() {
vm = $controller('NavbarController', {
$mdSidenav: $mdSidenav
});
});
describe('vm.closeSideNav', function() {
beforeEach(function() {
vm.closeSideNav()
});
it('should call $mdSidenav.close()', function() {
expect(sideNavCloseMock).toHaveBeenCalled();
});
});
});
And for a sanity check, my actual controller looks as follows:
(function () {
'use strict';
angular
.module('app.layout')
.controller('NavbarController', Controller);
Controller.$inject = ['$mdSidenav'];
function Controller($mdSidenav) {
var vm = this;
vm.closeSideNav = closeSideNav;
//This only affects the sideNav when its not locked into position, so only on small\medium screens
function closeSideNav() {
$mdSidenav('left').close();
}
}
})();
Unfortunately this still isn't working for me, and I end up with a different error
TypeError: undefined is not a constructor (evaluating '$mdSidenav('left').close())

Answer 1

close method doesn't belong to $mdSidenav. $mdSidenav is a function that returns a side nav object. That's why it complains 'close() method does not exist'.
What you can do is mock the $mdSidenav to return an object hat has mocked close method, like this: -
var sideNavCloseMock;
beforeEach(module(function($provide){
sideNavCloseMock = jasmine.createSpy();
$provide.factory('$mdSidenav', function() {
return function(sideNavId){
return {close: sideNavCloseMock};
};
});
}));
then do
it('should call $mdSidenav.close()', function() {
expect(sideNavCloseMock).toHaveBeenCalled();
});