JavaScript Karma error: unknown provider karma error spawn unknown,karma-server error spawn unknown

We are trying to test our controller with Karma, but Karma keeps complaining about an unknown provider:

Error: [$injector:unpr] Unknown provider: userProvider <- user

Are we injecting the user correctly?

Our code:

controller-test.js:

describe('Controller', function () {
    beforeEach(module('myApp'));

    var ctrl, scope, user;

    beforeEach(inject(function ($controller, $rootScope, _user_) {
        scope = $rootScope.$new();
        ctrl = $controller('controller', {
            $scope: scope
        });
        user = _user_;
    })); 

    it("should have scope defined", function () {
        expect(scope).toBeDefined();
    });
});

app.js:

(function () {
    var myApplication = angular.module("myApp", [
        "angucomplete-alt"            
    ]);

    fetchData().then(bootstrapApplication);

    function fetchData() {
        var initInjector = angular.injector(["ng"]);
        var $http = initInjector.get("$http");

        // Get user info before app is loaded
        return $http.get('/api/user').then(function (response) {
            myApplication.value("user", response.data);
        }, function (errorResponse) {
            // Handle error case
            console.error("Obtaining user information failed when bootstrapping Angular app");
        });
    }

    function bootstrapApplication() {
        angular.element(document).ready(function () {
            angular.bootstrap(document, ["myApp"]);
        });
    }
})();

controller.js:

angular.module("myApp")
.controller("controller", ["$scope", "user", "$window",
    function ($scope, user, $window) { ... }]);
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