Is there a way to mock the value of a hard private property in a unit test? For example, how can I expect something like
expect(event.getEventHis()).toBeEqual(['a', 'b'])export class EventController {
#event: [];
constructor() {
this.#event = [];
this.#lastIndex = 0;
}
getEventHis(): [] {
return this.#event;
}
getLastIndex(): number {
return this.#lstastIndex;
}
}
``
One way to simulate the behavior of the getEventHis() method and its output is by utilizing jest.spyOn(object, methodName).
For instance:
index.ts:
export class EventController {
#event: string[];
#lastIndex: number;
constructor() {
this.#event = [];
this.#lastIndex = 0;
}
getEventHis(): string[] {
return this.#event;
}
getLastIndex(): number {
return this.#lastIndex;
}
}
index.test.ts:
import { EventController } from './';
describe('68199289', () => {
it('should succeed', () => {
jest.spyOn(EventController.prototype, 'getEventHis').mockReturnValueOnce(['a', 'b']);
const event = new EventController();
expect(event.getEventHis()).toEqual(['a', 'b']);
});
});
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