import counterSlice, { selectValue, setValue, } from './counterSlice.js'; describe('the initial state', () => { test('has a value of zero', () => { const state = counterSlice.reducer(undefined, {}); expect(state).toEqual({ value: 0, }); }); }); describe('selectValue', () => { test('reads the stored value', () => { const state = { value: 9999, }; const result = selectValue({ [counterSlice.name]: state }); expect(result).toBe(9999); }); }); describe('setValue', () => { test('overwrites the stored value', () => { const state = counterSlice.reducer({ value: 8888, }, setValue({ value: 9999, })); expect(state).toEqual({ value: 9999, }); }); });