Jasmine + TypeScript, can`t find the withArgs () method of the Spy class

Question

According to the Jasmine documentation , the Spy object has a method withArgs ()

spyOn (someObj, 'func'). withArgs (1, 2, 3) .and.returnValue (42);

I can`t find this method in the version adapted for TypeScript. My project was created with angular-cli(ng new), Jasmine was provided from the box. When I try to call the withArgs() method, Visual Code writes to me that this method does not exist in the Spy class...

Answer 1

It's likely that you are either using an old version of jasmine, or an old version of the jasmine typings library. This particular method was introduced in Jasmine 3.0 . Notice that in the Jasmine 2.9 docs , the method does not exist.

All you need to do is update your Jasmine and jasmine typings libraries. Assuming you are using npm, you can do something like this:

npm i -D jasmine@latest jasmine-core@latest @types/jasmine@latest

This updates all jasmine related libraries to their latest version and saves it as devDependencies.

Answer 2

In my case, updating the Jasmine library was no option within the delivery time span due to company policies. Hence I could not use withArgs. I solved it by using callFake and manually check the argument there.Like this:

mockAuthenticationService = jasmine.createSpyObj<AuthenticationService>('authenticationService', ['hasPermission']);
mockAuthenticationService.hasPermission.and.callFake((permission) => {
  return (permission === 'MyPermission');
});