angular-docs-cn/packages/elements/test/utils_spec.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {camelToDashCase, createCustomEvent, isElement, isFunction, kebabToCamelCase, matchesSelector, scheduler, strictEquals} from '../src/utils';
describe('utils', () => {
describe('scheduler', () => {
describe('schedule()', () => {
let setTimeoutSpy: jasmine.Spy;
let clearTimeoutSpy: jasmine.Spy;
beforeEach(() => {
setTimeoutSpy = spyOn(window, 'setTimeout').and.returnValue(42);
clearTimeoutSpy = spyOn(window, 'clearTimeout');
});
it('should delegate to `window.setTimeout()`', () => {
const cb = () => null;
const delay = 1337;
scheduler.schedule(cb, delay);
expect(setTimeoutSpy).toHaveBeenCalledWith(cb, delay);
});
it('should return a function for cancelling the scheduled job', () => {
const cancelFn = scheduler.schedule(() => null, 0);
expect(clearTimeoutSpy).not.toHaveBeenCalled();
cancelFn();
expect(clearTimeoutSpy).toHaveBeenCalledWith(42);
});
});
describe('scheduleBeforeRender()', () => {
if (typeof window.requestAnimationFrame === 'undefined') {
const mockCancelFn = () => undefined;
let scheduleSpy: jasmine.Spy;
beforeEach(() => scheduleSpy = spyOn(scheduler, 'schedule').and.returnValue(mockCancelFn));
it('should delegate to `scheduler.schedule()`', () => {
const cb = () => null;
expect(scheduler.scheduleBeforeRender(cb)).toBe(mockCancelFn);
expect(scheduleSpy).toHaveBeenCalledWith(cb, 16);
});
} else {
let requestAnimationFrameSpy: jasmine.Spy;
let cancelAnimationFrameSpy: jasmine.Spy;
beforeEach(() => {
requestAnimationFrameSpy = spyOn(window, 'requestAnimationFrame').and.returnValue(42);
cancelAnimationFrameSpy = spyOn(window, 'cancelAnimationFrame');
});
it('should delegate to `window.requestAnimationFrame()`', () => {
const cb = () => null;
scheduler.scheduleBeforeRender(cb);
expect(requestAnimationFrameSpy).toHaveBeenCalledWith(cb);
});
it('should return a function for cancelling the scheduled job', () => {
const cancelFn = scheduler.scheduleBeforeRender(() => null);
expect(cancelAnimationFrameSpy).not.toHaveBeenCalled();
cancelFn();
expect(cancelAnimationFrameSpy).toHaveBeenCalledWith(42);
});
}
});
});
describe('camelToKebabCase()', () => {
it('should convert camel-case to kebab-case', () => {
expect(camelToDashCase('fooBarBazQux')).toBe('foo-bar-baz-qux');
expect(camelToDashCase('foo1Bar2Baz3Qux4')).toBe('foo1-bar2-baz3-qux4');
});
it('should keep existing dashes',
() => { expect(camelToDashCase('fooBar-baz-Qux')).toBe('foo-bar-baz--qux'); });
});
describe('createCustomEvent()', () => {
it('should create a custom event (with appropriate properties)', () => {
const value = {bar: 'baz'};
const event = createCustomEvent(document, 'foo', value);
expect(event).toEqual(jasmine.any(CustomEvent));
expect(event).toEqual(jasmine.any(Event));
expect(event.type).toBe('foo');
expect(event.bubbles).toBe(false);
expect(event.cancelable).toBe(false);
expect(event.detail).toEqual(value);
});
});
describe('isElement()', () => {
it('should return true for Element nodes', () => {
const elems = [
document.body,
document.createElement('div'),
document.createElement('option'),
document.documentElement,
];
elems.forEach(n => expect(isElement(n)).toBe(true));
});
it('should return false for non-Element nodes', () => {
const nonElems = [
document,
document.createAttribute('foo'),
document.createDocumentFragment(),
document.createComment('bar'),
document.createTextNode('baz'),
];
nonElems.forEach(n => expect(isElement(n)).toBe(false));
});
});
describe('isFunction()', () => {
it('should return true for functions', () => {
const obj = {foo: function() {}, bar: () => null, baz() {}};
const fns = [
function(){},
() => null,
obj.foo,
obj.bar,
obj.baz,
Function,
Date,
];
fns.forEach(v => expect(isFunction(v)).toBe(true));
});
it('should return false for non-functions', () => {
const nonFns = [
undefined,
null,
true,
42,
{},
];
nonFns.forEach(v => expect(isFunction(v)).toBe(false));
});
});
describe('kebabToCamelCase()', () => {
it('should convert camel-case to kebab-case', () => {
expect(kebabToCamelCase('foo-bar-baz-qux')).toBe('fooBarBazQux');
expect(kebabToCamelCase('foo1-bar2-baz3-qux4')).toBe('foo1Bar2Baz3Qux4');
expect(kebabToCamelCase('foo-1-bar-2-baz-3-qux-4')).toBe('foo1Bar2Baz3Qux4');
});
it('should keep uppercase letters', () => {
expect(kebabToCamelCase('foo-barBaz-Qux')).toBe('fooBarBaz-Qux');
expect(kebabToCamelCase('foo-barBaz--qux')).toBe('fooBarBaz-Qux');
});
});
describe('matchesSelector()', () => {
let li: HTMLLIElement;
beforeEach(() => {
const div = document.createElement('div');
div.innerHTML = `
<div class="bar" id="barDiv">
<span class="baz"></span>
<ul class="baz" id="bazUl">
<li class="qux" id="quxLi"></li>
</ul>
</div>
`;
li = div.querySelector('li') !;
});
it('should return whether the element matches the selector', () => {
expect(matchesSelector(li, 'li')).toBe(true);
expect(matchesSelector(li, '.qux')).toBe(true);
expect(matchesSelector(li, '#quxLi')).toBe(true);
expect(matchesSelector(li, '.qux#quxLi:not(.quux)')).toBe(true);
expect(matchesSelector(li, '.bar > #bazUl > li')).toBe(true);
expect(matchesSelector(li, '.bar .baz ~ .baz li')).toBe(true);
expect(matchesSelector(li, 'ol')).toBe(false);
expect(matchesSelector(li, '.quux')).toBe(false);
expect(matchesSelector(li, '#quuxOl')).toBe(false);
expect(matchesSelector(li, '.qux#quxLi:not(li)')).toBe(false);
expect(matchesSelector(li, '.bar > #bazUl > .quxLi')).toBe(false);
expect(matchesSelector(li, 'div span ul li')).toBe(false);
});
});
describe('strictEquals()', () => {
it('should perform strict equality check', () => {
const values = [
undefined,
null,
true,
false,
42,
'42',
() => undefined,
() => undefined,
{},
{},
];
values.forEach((v1, i) => {
values.forEach((v2, j) => { expect(strictEquals(v1, v2)).toBe(i === j); });
});
});
it('should consider two `NaN` values equals', () => {
expect(strictEquals(NaN, NaN)).toBe(true);
expect(strictEquals(NaN, 'foo')).toBe(false);
expect(strictEquals(NaN, 42)).toBe(false);
expect(strictEquals(NaN, null)).toBe(false);
expect(strictEquals(NaN, undefined)).toBe(false);
});
});
});