What is the best way to spy on a function that is not a method of an object? In my specific case, the function callMe is not defined on the window object - it is a dependency loaded through angular.
if (X) {
callMe('hello');
}
What is the best way to spy on a function that is not a method of an object? In my specific case, the function callMe is not defined on the window object - it is a dependency loaded through angular.
if (X) {
callMe('hello');
}
One way to create a spy object is by using the jasmine.createSpy method. This spy object, being a regular JavaScript object, can be utilized to replace your existing callMe function for the purpose of monitoring its behavior.
function callMe() {
// implementation
}
describe('an example block', function() {
it('creates a spy', function() {
callMe = jasmine.createSpy('callMe');
callMe();
expect(callMe).toHaveBeenCalled();
});
});
According to the Jasmine 2.5 documentation:
When no specific function is available to be spied on,
jasmine.createSpycan generate a "bare" spy. This type of spy behaves like any other spy — keeping track of calls, arguments, etc. However, there is no underlying implementation associated with it. Spies are essentially JavaScript objects that can be manipulated as such.
If you want to inject a spy into your controller, you can create it and then pass it in. Take a look at this example:
beforeEach(
inject(function (_$controller_) {
myController = _$controller_('myControllerName', {
callMe: jasmine.createSpy('callMe');
});
})
);
By using this approach, the callMe object will be replaced with the newly created spy in your controller.
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