In what way can you retrieve scope values (when testing) from an Angular controller implemented in TypeScript?

When working with Angular controllers in TypeScript, you have the option to define your controller in a way that accepts the $scope as an input parameter:

class TestCtrl {

    constructor($scope:ng.IScopeService) {
        $scope.myData = "Information";
    }
}

In order to verify properties on the scope during tests, you can do so easily by following these steps:

beforeEach(function() {
    $controller("TestCtrl", { $scope: $scope });
});

it("Should have some data set upon creation", function() {
    expect($scope.myData).not.toBeUndefined(); // This allows us to assert the presence of the data.
});

An alternative method is to create your controller without providing the $scope parameter in the constructor:

interface ITestScope {
    myData: string;
}

class TestCtrl implements ITestScope {
    myData: string; // This property will still be available on the scope.

    constructor() {
         this.myData = "Information";   
    }
}

The issue arises when trying to access and verify the scope data in tests without direct access to $scope. How would you handle this situation?

Answer №1

Ensure to not inject a scope into your controller (

constructor($scope:ng.IScopeService) {
). There is no need to pass it in the locals of $controller. It appears that you are utilizing the controller as syntax, indicated by how you assign properties on the controller instance. Simply use the controller instance returned by the $controller service.

For example:

var ctrl;
beforeEach(function() {
   ctrl = $controller("MyCtrl", {}); //Omit locals and store result in a variable
});

it("Expect some data to be set upon creation", function() {
    expect(ctrl.myData).not.toBeUndefined(); // Define your expectation based on the controller instance
   //expect(ctrl.myData).toBeDefined() //This achieves the same result...
});

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