Also under the alias: .toBeCalledWith()
Use .toHaveBeenCalledWith
to ensure that a mock function was called with specific arguments.
For example, let’s say that you can register a beverage with a register
function, and applyToAll(f)
should apply the function f
to all registered beverages. To make sure this works, you could write:
test('registration applies correctly to orange La Croix', () => {
const beverage = new LaCroix('orange');
register(beverage);
const f = jest.fn();
applyToAll(f);
expect(f).toHaveBeenCalledWith(beverage);
});