109 lines
3.6 KiB
TypeScript
109 lines
3.6 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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 {CommonModule, SlicePipe} from '@angular/common';
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import {Component} from '@angular/core';
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import {TestBed, async} from '@angular/core/testing';
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import {expect} from '@angular/platform-browser/testing/src/matchers';
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{
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describe('SlicePipe', () => {
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let list: number[];
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let str: string;
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let pipe: SlicePipe;
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beforeEach(() => {
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list = [1, 2, 3, 4, 5];
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str = 'tuvwxyz';
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pipe = new SlicePipe();
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});
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describe('supports', () => {
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it('should support strings', () => { expect(() => pipe.transform(str, 0)).not.toThrow(); });
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it('should support lists', () => { expect(() => pipe.transform(list, 0)).not.toThrow(); });
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it('should not support other objects',
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() => { expect(() => pipe.transform({}, 0)).toThrow(); });
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});
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describe('transform', () => {
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it('should return null if the value is null',
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() => { expect(pipe.transform(null, 1)).toBe(null); });
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it('should return all items after START index when START is positive and END is omitted',
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() => {
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expect(pipe.transform(list, 3)).toEqual([4, 5]);
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expect(pipe.transform(str, 3)).toEqual('wxyz');
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});
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it('should return last START items when START is negative and END is omitted', () => {
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expect(pipe.transform(list, -3)).toEqual([3, 4, 5]);
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expect(pipe.transform(str, -3)).toEqual('xyz');
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});
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it('should return all items between START and END index when START and END are positive',
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() => {
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expect(pipe.transform(list, 1, 3)).toEqual([2, 3]);
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expect(pipe.transform(str, 1, 3)).toEqual('uv');
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});
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it('should return all items between START and END from the end when START and END are negative',
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() => {
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expect(pipe.transform(list, -4, -2)).toEqual([2, 3]);
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expect(pipe.transform(str, -4, -2)).toEqual('wx');
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});
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it('should return an empty value if START is greater than END', () => {
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expect(pipe.transform(list, 4, 2)).toEqual([]);
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expect(pipe.transform(str, 4, 2)).toEqual('');
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});
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it('should return an empty value if START greater than input length', () => {
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expect(pipe.transform(list, 99)).toEqual([]);
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expect(pipe.transform(str, 99)).toEqual('');
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});
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it('should return entire input if START is negative and greater than input length', () => {
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expect(pipe.transform(list, -99)).toEqual([1, 2, 3, 4, 5]);
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expect(pipe.transform(str, -99)).toEqual('tuvwxyz');
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});
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it('should not modify the input list', () => {
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expect(pipe.transform(list, 2)).toEqual([3, 4, 5]);
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expect(list).toEqual([1, 2, 3, 4, 5]);
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});
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});
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describe('integration', () => {
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@Component({selector: 'test-comp', template: '{{(data | slice:1).join(",") }}'})
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class TestComp {
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data: any;
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}
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beforeEach(() => {
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TestBed.configureTestingModule({declarations: [TestComp], imports: [CommonModule]});
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});
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it('should work with mutable arrays', async(() => {
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const fixture = TestBed.createComponent(TestComp);
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const mutable: number[] = [1, 2];
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fixture.componentInstance.data = mutable;
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fixture.detectChanges();
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expect(fixture.nativeElement).toHaveText('2');
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mutable.push(3);
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fixture.detectChanges();
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expect(fixture.nativeElement).toHaveText('2,3');
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}));
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});
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});
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}
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