overmind/es/utils.test.js

Frictionless state management

import { deepCopy, getChangeMutations } from './utils';
describe('deepCopy', () => {
    test('should be able to preserve getters', () => {
        expect.assertions(1);
        const original = {
            value: 0,
            get valuePlusTwo() {
                return this.value + 2;
            },
        };
        const copy = deepCopy(original);
        copy.value = 15;
        expect(copy.valuePlusTwo).toBe(17);
    });
});
describe('getChangeMutations', () => {
    test('should be able to create a set mutation when value has changed', () => {
        const stateA = {
            foo: 'bar',
        };
        const stateB = {
            foo: 'bar2',
        };
        const mutations = getChangeMutations(stateA, stateB);
        expect(mutations[0].path).toBe('foo');
        expect(mutations[0].args[0]).toBe('bar2');
    });
    test('should be able to create a set mutation when nested value has changed', () => {
        const stateA = {
            foo: {
                bar: {
                    baz: 'mip',
                },
            },
        };
        const stateB = {
            foo: {
                bar: {
                    baz: 'mip2',
                },
            },
        };
        const mutations = getChangeMutations(stateA, stateB);
        expect(mutations.length).toBe(1);
        expect(mutations[0].path).toBe('foo.bar.baz');
        expect(mutations[0].args[0]).toBe('mip2');
    });
    test('should be able to create an unset mutation when key is not there anymore', () => {
        const stateA = {
            foo: {
                bar: {
                    baz: 'mip',
                },
            },
        };
        const stateB = {
            foo: {
                bar: {},
            },
        };
        const mutations = getChangeMutations(stateA, stateB);
        expect(mutations.length).toBe(1);
        expect(mutations[0].path).toBe('foo.bar.baz');
        expect(mutations[0].method).toBe('unset');
    });
});
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