84 lines
2.6 KiB
TypeScript
84 lines
2.6 KiB
TypeScript
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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ComponentTemplate} from '@angular/core/src/render3';
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import {createLView, createTNode, createTView} from '@angular/core/src/render3/instructions/shared';
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import {TConstants, TElementNode, TNodeType} from '@angular/core/src/render3/interfaces/node';
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import {domRendererFactory3} from '@angular/core/src/render3/interfaces/renderer';
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import {LView, LViewFlags, T_HOST, TView, TViewType} from '@angular/core/src/render3/interfaces/view';
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import {enterView, leaveView, specOnlyIsInstructionStateEmpty} from '@angular/core/src/render3/state';
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import {noop} from '@angular/core/src/util/noop';
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/**
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* Fixture useful for testing operations which need `LView` / `TView`
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*/
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export class ViewFixture {
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/**
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* Clean up the `LFrame` stack between tests.
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*/
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static cleanUp() {
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while (!specOnlyIsInstructionStateEmpty()) {
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leaveView();
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}
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}
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/**
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* DOM element which acts as a host to the `LView`.
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*/
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host: HTMLElement;
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tView: TView;
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lView: LView;
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constructor({template, decls, vars, consts, context}: {
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decls?: number,
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vars?: number,
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template?: ComponentTemplate<any>,
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consts?: TConstants,
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context?: {}
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} = {}) {
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const hostRenderer = domRendererFactory3.createRenderer(null, null);
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this.host = hostRenderer.createElement('host-element') as HTMLElement;
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const hostTView = createTView(TViewType.Root, null, null, 1, 0, null, null, null, null, null);
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const hostLView = createLView(
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null, hostTView, {}, LViewFlags.CheckAlways | LViewFlags.IsRoot, null, null,
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domRendererFactory3, hostRenderer, null, null);
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this.tView = createTView(
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TViewType.Component, null, template || noop, decls || 0, vars || 0, null, null, null, null,
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consts || null);
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const hostTNode =
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createTNode(hostTView, null, TNodeType.Element, 0, 'host-element', null) as TElementNode;
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this.lView = createLView(
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hostLView, this.tView, context || {}, LViewFlags.CheckAlways, this.host, hostTNode,
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domRendererFactory3, hostRenderer, null, null);
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}
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/**
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* If you use `ViewFixture` and `enter()`, please add `afterEach(ViewFixture.cleanup);` to ensure
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* that he global `LFrame` stack gets cleaned up between the tests.
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*/
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enterView() {
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enterView(this.lView);
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}
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leaveView() {
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leaveView();
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}
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apply(fn: () => void) {
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this.enterView();
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try {
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fn();
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} finally {
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this.leaveView();
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}
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}
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}
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