angular-cn/packages/platform-browser/test/dom/shared_styles_host_spec.ts

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/**
* @license
* Copyright Google LLC 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 {ɵgetDOM as getDOM} from '@angular/common';
import {beforeEach, describe, it} from '@angular/core/testing/src/testing_internal';
import {DomSharedStylesHost} from '@angular/platform-browser/src/dom/shared_styles_host';
import {expect} from '@angular/platform-browser/testing/src/matchers';
{
describe('DomSharedStylesHost', () => {
let doc: Document;
let ssh: DomSharedStylesHost;
let someHost: Element;
beforeEach(() => {
doc = getDOM().createHtmlDocument();
doc.title = '';
ssh = new DomSharedStylesHost(doc);
someHost = getDOM().createElement('div');
});
it('should add existing styles to new hosts', () => {
ssh.addStyles(['a {};']);
ssh.addHost(someHost);
expect(someHost.innerHTML).toEqual('<style>a {};</style>');
});
it('should add new styles to hosts', () => {
ssh.addHost(someHost);
ssh.addStyles(['a {};']);
expect(someHost.innerHTML).toEqual('<style>a {};</style>');
});
it('should add styles only once to hosts', () => {
ssh.addStyles(['a {};']);
ssh.addHost(someHost);
ssh.addStyles(['a {};']);
expect(someHost.innerHTML).toEqual('<style>a {};</style>');
});
it('should use the document head as default host', () => {
ssh.addStyles(['a {};', 'b {};']);
expect(doc.head).toHaveText('a {};b {};');
});
it('should remove style nodes on destroy', () => {
ssh.addStyles(['a {};']);
ssh.addHost(someHost);
expect(someHost.innerHTML).toEqual('<style>a {};</style>');
ssh.ngOnDestroy();
expect(someHost.innerHTML).toEqual('');
});
});
}