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https://github.com/angular/angular
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d452b388bd
At present, the get() method provided by HttpContext will never return null. Sometimes we need to check whether an http token is included, so add the has() method to HttpContext. PR Close #43887
63 lines
2 KiB
TypeScript
63 lines
2 KiB
TypeScript
/**
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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 {HttpContext, HttpContextToken} from '../src/context';
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const IS_ENABLED = new HttpContextToken<boolean>(() => false);
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const UNUSED = new HttpContextToken<boolean>(() => true);
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const CACHE_OPTION =
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new HttpContextToken<{cache: boolean, expiresIn?: number}>(() => ({cache: false}));
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describe('HttpContext', () => {
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let context: HttpContext;
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beforeEach(() => {
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context = new HttpContext();
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});
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describe('with basic value', () => {
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it('should test public api', () => {
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expect(context.has(UNUSED)).toBe(false);
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expect(context.get(IS_ENABLED)).toBe(false);
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expect([...context.keys()]).toEqual([
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IS_ENABLED
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]); // value from factory function is stored in the map upon access
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expect(context.has(IS_ENABLED)).toBe(true);
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context.set(IS_ENABLED, true);
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expect(context.has(IS_ENABLED)).toBe(true);
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expect(context.get(IS_ENABLED)).toBe(true);
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expect([...context.keys()]).toEqual([IS_ENABLED]);
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context.delete(IS_ENABLED);
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expect([...context.keys()]).toEqual([]);
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});
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});
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describe('with complex value', () => {
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it('should test public api', () => {
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expect(context.get(CACHE_OPTION)).toEqual({cache: false});
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expect([...context.keys()]).toEqual([CACHE_OPTION]);
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const value = {cache: true, expiresIn: 30};
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context.set(CACHE_OPTION, value);
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expect(context.get(CACHE_OPTION)).toBe(value);
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expect([...context.keys()]).toEqual([CACHE_OPTION]);
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context.delete(CACHE_OPTION);
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expect([...context.keys()]).toEqual([]);
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});
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it('should ensure that same reference is returned for default value between multiple accesses',
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() => {
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const value = context.get(CACHE_OPTION); // will get default value
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expect(value).toEqual({cache: false});
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expect(context.get(CACHE_OPTION)).toBe(value);
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});
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});
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});
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