How to test AngularJS custom provider

Question

Does anyone have an example of how to unit test a provider?

For example:

config.js

an         


        

Answer 1

@Stephane Catala's answer was particularly helpful, and I used his providerGetter to get exactly what I wanted. Being able to get the provider to do initialization and then the actual service to validate that things are working correctly with various settings was important. Example code:

    angular
        .module('test', [])
        .provider('info', info);

    function info() {
        var nfo = 'nothing';
        this.setInfo = function setInfo(s) { nfo = s; };
        this.$get = Info;

        function Info() {
            return { getInfo: function() {return nfo;} };
        }
    }

The Jasmine test spec:

    describe("provider test", function() {

        var infoProvider, info;

        function providerGetter(moduleName, providerName) {
            var provider;
            module(moduleName, 
                         [providerName, function(Provider) { provider = Provider; }]);
            return function() { inject(); return provider; }; // inject calls the above
        }

        beforeEach(function() {
            infoProvider = providerGetter('test', 'infoProvider')();
        });

        it('should return nothing if not set', function() {
            inject(function(_info_) { info = _info_; });
            expect(info.getInfo()).toEqual('nothing');
        });

        it('should return the info that was set', function() {
            infoProvider.setInfo('something');
            inject(function(_info_) { info = _info_; });
            expect(info.getInfo()).toEqual('something');
        });

    });