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storage_test.js
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storage_test.js
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const assert = require('assert');
const brains = require('./helpers/brains');
const Browser = require('../src');
describe('Window', function() {
const browser = new Browser();
before(function() {
brains.static('/storage', '<html></html>');
return brains.ready();
});
function addTests(getStorage) {
describe('initial', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
});
it('should start with no keys', function() {
assert.equal(storage.length, 0);
});
it('should handle key() with no key', function() {
assert(!storage.key(10));
});
it('should handle getItem() with no item', function() {
assert.equal(storage.getItem('nosuch'), null);
});
it('should handle removeItem() with no item', function() {
assert.doesNotThrow(function() {
storage.removeItem('nosuch');
});
});
it('should handle clear() with no items', function() {
assert.doesNotThrow(function() {
storage.clear();
});
});
});
describe('add some items', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
storage.setItem('is', 'hungry');
storage.setItem('wants', 'brains');
});
it('should count all items in length', function() {
assert.equal(storage.length, 2);
});
it('should make key available', function() {
const keys = [storage.key(0), storage.key(1)].sort();
assert.deepEqual(keys, ['is', 'wants']);
});
it('should make value available', function() {
assert.equal(storage.getItem('is'), 'hungry');
assert.equal(storage.getItem('wants'), 'brains');
});
});
describe('change an item', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
storage.setItem('is', 'hungry');
storage.setItem('wants', 'brains');
storage.setItem('is', 'dead');
});
it('should leave length intact', function() {
assert.equal(storage.length, 2);
});
it('should keep key position', function() {
const keys = [storage.key(0), storage.key(1)].sort();
assert.deepEqual([storage.key(0), storage.key(1)].sort(), keys);
});
it('should change value', function() {
assert.equal(storage.getItem('is'), 'dead');
});
it('should not change other values', function() {
assert.equal(storage.getItem('wants'), 'brains');
});
});
describe('remove an item', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
storage.setItem('is', 'hungry');
storage.setItem('wants', 'brains');
storage.removeItem('is');
});
it('should drop item from length', function() {
assert.equal(storage.length, 1);
});
it('should forget key', function() {
assert.equal(storage.key(0), 'wants');
assert(!storage.key(1));
});
it('should forget value', function() {
assert.equal(storage.getItem('is'), null);
assert.equal(storage.getItem('wants'), 'brains');
});
});
describe('clean all items', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
storage.setItem('is', 'hungry');
storage.setItem('wants', 'brains');
storage.clear();
});
it('should reset length to zero', function() {
assert.equal(storage.length, 0);
});
it('should forget all keys', function() {
assert(!storage.key(0));
});
it('should forget all values', function() {
assert.equal(storage.getItem('is'), null);
assert.equal(storage.getItem('wants'), null);
});
});
describe('store null', function() {
let storage;
before(async function() {
await browser.visit('/storage');
storage = getStorage(browser.window);
storage.setItem('null', null);
});
it('should store that item', function() {
assert.equal(storage.length, 1);
});
it('should return null for key', function() {
assert.equal(storage.getItem('null'), null);
});
});
}
describe('local storage', function() {
function getStorage(window) {
return window.localStorage;
}
addTests.call(this, getStorage);
});
describe('session storage', function() {
function getStorage(window) {
return window.sessionStorage;
}
addTests.call(this, getStorage);
});
after(function() {
browser.destroy();
});
});