AngularJS Jasmine testing init functions - angularjs

Question

I'm trying to test function calls from my controller's init function. I route various logic based on stateParams and want to write unit tests against this scenarios but I'm having trouble getting it working.
My init function
var _init = function () {
// Get full companyList
servicecall().then(function (response) {
if ($stateParams.ID) {
$scope.callOne();
}
else if ($stateParams.Index == -1) {
$scope.callTwo();
}
else if ($stateParams.Index == '' || $stateParams.Index == null) {
$scope.callThree();
}
else
$scope.callFour();
},
function (err) {
console.log(err);
});
};
_init();
So simply I want to set $stateParams.Index = -1, and make sure callTwo() gets called.
My beforeEach looks like
beforeEach(function () {
controller = $controller('Controller', {
$scope: $scope,
$stateParams: $stateParams,
$state: $state
});
// And add $scope's spyOns
spyOn($scope, 'callOne').and.callThrough();
spyOn($scope, 'callTwo').and.callThrough();
spyOn($scope, 'callThree').and.callThrough();
spyOn($scope, 'callFour').and.callThrough();
});
At first I tried the below, which of course did not work; it says spy was not called.
it("should call callTwo if stateParams.index is -1", function () {
$stateParams.Index = -1;
expect($scope.callTwo()).toHaveBeenCalled();
});
I figured that all of the init was happening before my spy attached, so then I tried moving that stuff inside of my it call but everything broke down.
This one says callTwo has already been spied upon.
it("should call callTwo if stateParams is -1", function () {
$stateParams.Index = -1;
spyOn($scope, 'callTwo').and.callThrough();
controller = $controller('Controller', {
$scope: $scope,
$stateParams: $stateParams,
$state: $state
});
expect($scope.callTwo).toHaveBeenCalled();
});
But if I move the spy declaration after the controller is initialized it says it's not called again
How can I ensure calls are being made as expected during a controller instantiation?

Answer 1

Not sure if it's the best solution, but currently nothing else comes to mind and this definitely works.
You can have a describe for every such test, since the $stateParams are injected when you create your controller. That's why doing it inside the it is not sufficient since the $scope at that time belongs to the controller already created.
So you need to have:
describe('Controller tests for when Index === -1', function () {
beforeEach(function (...) {
$stateParams.Index = -1;
controller = $controller('Controller', {
$scope: $scope,
$stateParams: $stateParams,
$state: $state
});
}
// it tests for Index === -1 case
});
So in this example all of the it tests you'll have are guaranteed to have $stateParams === 1. Same will go for your other values.