Unit test typescript types

Question

I have the following export in one of my modules:

export class Action1 implements Action {}

export class Action2 implements Action {}

export type ActionsUnion =
  | Action1
  | Action2;

I am trying to work out the best way to test ActionsUnion to make sure it is of the types I have defined. For example:

it('should have the correct types', () => {
  expect(typeof Action1).toEqual(ActionsUnion);
  expect(typeof Action2).toEqual(ActionsUnion);
});

Of course the above doesn't work as I am using ActionsUnion as a variable. Any ideas on how to achieve the above?

For context, I am using angular, ngrx and jasmine.

user_8105437 · Answer

I have not tried it with a union, but you may want to try jasmine.any(Type). In this case your code above would be:

it('should have the correct types', () => {
  expect(Action1).toEqual(jasmine.any(ActionsUnion));
  expect(Action2).toEqual(jasmine.any(ActionsUnion));
});

Details here: https://jasmine.github.io/2.0/introduction.html#section-Matching_Anything_with_%3Ccode%3Ejasmine.any%3C/code%3E

Unit test typescript types

1 Answers