updux/src/createStore.test.ts

import { test, expect } from 'vitest';
import Updux, { createAction, withPayload } from './index.js';

const incr = createAction('incr', withPayload<number>());

const dux = new Updux({
    initialState: 1,
    // selectors: {
    //     double: (x: string) => x + x,
    // },
}).addMutation(incr, (i, action) => state => {
    expectTypeOf(i).toEqualTypeOf<number>();
    expectTypeOf(state).toEqualTypeOf<number>();
    expectTypeOf(action).toEqualTypeOf<{ type: 'incr', payload: number; }>();
    return state + i
});

suite.only('store dispatch actions', () => {
    const store = dux.createStore();

    test('dispatch actions', () => {
        expect(store.dispatch.incr).toBeTypeOf('function');
        expectTypeOf(store.dispatch.incr).toMatchTypeOf<Function>();
    });

    test('reducer does something', () => {
        store.dispatch.incr(7);
        expect(store.getState()).toEqual(8);
    });
});