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import { shallowMount } from '@vue/test-utils';
import LocalStorageSync from '~/vue_shared/components/local_storage_sync.vue';
describe('Local Storage Sync', () => {
let wrapper;
const createComponent = ({ props = {}, slots = {} } = {}) => {
wrapper = shallowMount(LocalStorageSync, {
propsData: props,
slots,
});
};
afterEach(() => {
wrapper.destroy();
wrapper = null;
localStorage.clear();
});
it('is a renderless component', () => {
const html = '<div class="test-slot"></div>';
createComponent({
props: {
storageKey: 'key',
},
slots: {
default: html,
},
});
expect(wrapper.html()).toBe(html);
});
describe('localStorage empty', () => {
const storageKey = 'issue_list_order';
it('does not emit input event', () => {
createComponent({
props: {
storageKey,
value: 'ascending',
},
});
expect(wrapper.emitted('input')).toBeFalsy();
});
it('saves updated value to localStorage', () => {
createComponent({
props: {
storageKey,
value: 'ascending',
},
});
const newValue = 'descending';
wrapper.setProps({
value: newValue,
});
return wrapper.vm.$nextTick().then(() => {
expect(localStorage.getItem(storageKey)).toBe(newValue);
});
});
it('does not save default value', () => {
const value = 'ascending';
createComponent({
props: {
storageKey,
value,
},
});
expect(localStorage.getItem(storageKey)).toBe(null);
});
});
describe('localStorage has saved value', () => {
const storageKey = 'issue_list_order_by';
const savedValue = 'last_updated';
beforeEach(() => {
localStorage.setItem(storageKey, savedValue);
});
it('emits input event with saved value', () => {
createComponent({
props: {
storageKey,
value: 'ascending',
},
});
expect(wrapper.emitted('input')[0][0]).toBe(savedValue);
});
it('does not overwrite localStorage with prop value', () => {
createComponent({
props: {
storageKey,
value: 'created',
},
});
expect(localStorage.getItem(storageKey)).toBe(savedValue);
});
it('updating the value updates localStorage', () => {
createComponent({
props: {
storageKey,
value: 'created',
},
});
const newValue = 'last_updated';
wrapper.setProps({
value: newValue,
});
return wrapper.vm.$nextTick().then(() => {
expect(localStorage.getItem(storageKey)).toBe(newValue);
});
});
});
});
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