updux/src/mutations.test.js

import { test, expect } from 'vitest';
import schema from 'json-schema-shorthand';
import u from 'updeep';

import { action } from './actions.js';

import { Updux } from './Updux.js';

test('set a mutation', () => {
    const dux = new Updux({
        initial: {
            x: 'potato',
        },
        actions: {
            foo: action('foo', (x) => ({ x })),
            bar: action('bar'),
        },
    });

    dux.setMutation(dux.actions.foo, (payload, action) =>
        u({
            x: payload.x + action.type,
        }),
    );

    const result = dux.reducer(undefined, dux.actions.foo('hello '));
    expect(result).toEqual({
        x: 'hello foo',
    });
});