410 lines
14 KiB
TypeScript
410 lines
14 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 {CommonModule} from '@angular/common';
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import {Component} from '@angular/core';
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import {async, ComponentFixture, TestBed} from '@angular/core/testing';
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import {By} from '@angular/platform-browser/src/dom/debug/by';
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import {expect} from '@angular/platform-browser/testing/src/matchers';
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let thisArg: any;
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{
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describe('ngFor', () => {
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let fixture: ComponentFixture<any>;
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function getComponent(): TestComponent {
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return fixture.componentInstance;
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}
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function detectChangesAndExpectText(text: string): void {
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fixture.detectChanges();
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expect(fixture.nativeElement).toHaveText(text);
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}
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afterEach(() => {
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fixture = null as any;
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});
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beforeEach(() => {
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TestBed.configureTestingModule({
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declarations: [TestComponent],
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imports: [CommonModule],
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});
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});
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it('should reflect initial elements', async(() => {
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fixture = createTestComponent();
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detectChangesAndExpectText('1;2;');
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}));
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it('should reflect added elements', async(() => {
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fixture = createTestComponent();
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fixture.detectChanges();
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getComponent().items.push(3);
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detectChangesAndExpectText('1;2;3;');
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}));
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it('should reflect removed elements', async(() => {
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fixture = createTestComponent();
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fixture.detectChanges();
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getComponent().items.splice(1, 1);
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detectChangesAndExpectText('1;');
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}));
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it('should reflect moved elements', async(() => {
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fixture = createTestComponent();
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fixture.detectChanges();
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getComponent().items.splice(0, 1);
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getComponent().items.push(1);
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detectChangesAndExpectText('2;1;');
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}));
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it('should reflect a mix of all changes (additions/removals/moves)', async(() => {
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fixture = createTestComponent();
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getComponent().items = [0, 1, 2, 3, 4, 5];
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fixture.detectChanges();
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getComponent().items = [6, 2, 7, 0, 4, 8];
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detectChangesAndExpectText('6;2;7;0;4;8;');
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}));
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it('should iterate over an array of objects', async(() => {
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const template = '<ul><li *ngFor="let item of items">{{item["name"]}};</li></ul>';
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fixture = createTestComponent(template);
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// INIT
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getComponent().items = [{'name': 'misko'}, {'name': 'shyam'}];
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detectChangesAndExpectText('misko;shyam;');
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// GROW
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getComponent().items.push({'name': 'adam'});
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detectChangesAndExpectText('misko;shyam;adam;');
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// SHRINK
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getComponent().items.splice(2, 1);
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getComponent().items.splice(0, 1);
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detectChangesAndExpectText('shyam;');
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}));
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it('should gracefully handle nulls', async(() => {
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const template = '<ul><li *ngFor="let item of null">{{item}};</li></ul>';
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fixture = createTestComponent(template);
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detectChangesAndExpectText('');
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}));
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it('should gracefully handle ref changing to null and back', async(() => {
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fixture = createTestComponent();
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detectChangesAndExpectText('1;2;');
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getComponent().items = null!;
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detectChangesAndExpectText('');
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getComponent().items = [1, 2, 3];
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detectChangesAndExpectText('1;2;3;');
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}));
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it('should throw on non-iterable ref and suggest using an array', async(() => {
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fixture = createTestComponent();
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getComponent().items = <any>'whaaa';
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expect(() => fixture.detectChanges())
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.toThrowError(
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/Cannot find a differ supporting object 'whaaa' of type 'string'. NgFor only supports binding to Iterables such as Arrays/);
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}));
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it('should throw on ref changing to string', async(() => {
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fixture = createTestComponent();
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detectChangesAndExpectText('1;2;');
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getComponent().items = <any>'whaaa';
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expect(() => fixture.detectChanges()).toThrowError();
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}));
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it('should works with duplicates', async(() => {
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fixture = createTestComponent();
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const a = new Foo();
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getComponent().items = [a, a];
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detectChangesAndExpectText('foo;foo;');
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}));
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it('should repeat over nested arrays', async(() => {
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const template = '<div *ngFor="let item of items">' +
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'<div *ngFor="let subitem of item">{{subitem}}-{{item.length}};</div>|' +
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'</div>';
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fixture = createTestComponent(template);
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getComponent().items = [['a', 'b'], ['c']];
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detectChangesAndExpectText('a-2;b-2;|c-1;|');
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getComponent().items = [['e'], ['f', 'g']];
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detectChangesAndExpectText('e-1;|f-2;g-2;|');
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}));
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it('should repeat over nested arrays with no intermediate element', async(() => {
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const template = '<div *ngFor="let item of items">' +
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'<div *ngFor="let subitem of item">{{subitem}}-{{item.length}};</div>' +
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'</div>';
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fixture = createTestComponent(template);
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getComponent().items = [['a', 'b'], ['c']];
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detectChangesAndExpectText('a-2;b-2;c-1;');
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getComponent().items = [['e'], ['f', 'g']];
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detectChangesAndExpectText('e-1;f-2;g-2;');
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}));
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it('should repeat over nested ngIf that are the last node in the ngFor template', async(() => {
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const template = `<div *ngFor="let item of items; let i=index">` +
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`<div>{{i}}|</div>` +
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`<div *ngIf="i % 2 == 0">even|</div>` +
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`</div>`;
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fixture = createTestComponent(template);
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const items = [1];
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getComponent().items = items;
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detectChangesAndExpectText('0|even|');
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items.push(1);
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detectChangesAndExpectText('0|even|1|');
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items.push(1);
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detectChangesAndExpectText('0|even|1|2|even|');
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}));
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it('should allow of saving the collection', async(() => {
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const template =
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'<ul><li *ngFor="let item of items as collection; index as i">{{i}}/{{collection.length}} - {{item}};</li></ul>';
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fixture = createTestComponent(template);
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detectChangesAndExpectText('0/2 - 1;1/2 - 2;');
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getComponent().items = [1, 2, 3];
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detectChangesAndExpectText('0/3 - 1;1/3 - 2;2/3 - 3;');
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}));
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it('should display indices correctly', async(() => {
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const template = '<span *ngFor ="let item of items; let i=index">{{i.toString()}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
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detectChangesAndExpectText('0123456789');
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getComponent().items = [1, 2, 6, 7, 4, 3, 5, 8, 9, 0];
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detectChangesAndExpectText('0123456789');
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}));
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it('should display count correctly', async(() => {
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const template = '<span *ngFor="let item of items; let len=count">{{len}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2];
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detectChangesAndExpectText('333');
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getComponent().items = [4, 3, 2, 1, 0, -1];
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detectChangesAndExpectText('666666');
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}));
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it('should display first item correctly', async(() => {
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const template =
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'<span *ngFor="let item of items; let isFirst=first">{{isFirst.toString()}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2];
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detectChangesAndExpectText('truefalsefalse');
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getComponent().items = [2, 1];
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detectChangesAndExpectText('truefalse');
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}));
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it('should display last item correctly', async(() => {
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const template =
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'<span *ngFor="let item of items; let isLast=last">{{isLast.toString()}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2];
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detectChangesAndExpectText('falsefalsetrue');
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getComponent().items = [2, 1];
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detectChangesAndExpectText('falsetrue');
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}));
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it('should display even items correctly', async(() => {
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const template =
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'<span *ngFor="let item of items; let isEven=even">{{isEven.toString()}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2];
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detectChangesAndExpectText('truefalsetrue');
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getComponent().items = [2, 1];
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detectChangesAndExpectText('truefalse');
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}));
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it('should display odd items correctly', async(() => {
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const template =
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'<span *ngFor="let item of items; let isOdd=odd">{{isOdd.toString()}}</span>';
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fixture = createTestComponent(template);
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getComponent().items = [0, 1, 2, 3];
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detectChangesAndExpectText('falsetruefalsetrue');
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getComponent().items = [2, 1];
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detectChangesAndExpectText('falsetrue');
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}));
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it('should allow to use a custom template', async(() => {
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const template =
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'<ng-container *ngFor="let item of items; template: tpl"></ng-container>' +
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'<ng-template let-item let-i="index" #tpl><p>{{i}}: {{item}};</p></ng-template>';
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fixture = createTestComponent(template);
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getComponent().items = ['a', 'b', 'c'];
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fixture.detectChanges();
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detectChangesAndExpectText('0: a;1: b;2: c;');
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}));
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it('should use a default template if a custom one is null', async(() => {
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const template =
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`<ul><ng-container *ngFor="let item of items; template: null; let i=index">{{i}}: {{item}};</ng-container></ul>`;
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fixture = createTestComponent(template);
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getComponent().items = ['a', 'b', 'c'];
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fixture.detectChanges();
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detectChangesAndExpectText('0: a;1: b;2: c;');
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}));
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it('should use a custom template when both default and a custom one are present', async(() => {
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const template =
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'<ng-container *ngFor="let item of items; template: tpl">{{i}};</ng-container>' +
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'<ng-template let-item let-i="index" #tpl>{{i}}: {{item}};</ng-template>';
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fixture = createTestComponent(template);
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getComponent().items = ['a', 'b', 'c'];
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fixture.detectChanges();
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detectChangesAndExpectText('0: a;1: b;2: c;');
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}));
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describe('track by', () => {
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it('should console.warn if trackBy is not a function', async(() => {
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// TODO(vicb): expect a warning message when we have a proper log service
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const template = `<p *ngFor="let item of items; trackBy: value"></p>`;
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fixture = createTestComponent(template);
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fixture.componentInstance.value = 0;
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fixture.detectChanges();
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}));
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it('should track by identity when trackBy is to `null` or `undefined`', async(() => {
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// TODO(vicb): expect no warning message when we have a proper log service
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const template = `<p *ngFor="let item of items; trackBy: value">{{ item }}</p>`;
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fixture = createTestComponent(template);
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fixture.componentInstance.items = ['a', 'b', 'c'];
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fixture.componentInstance.value = null;
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detectChangesAndExpectText('abc');
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fixture.componentInstance.value = undefined;
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detectChangesAndExpectText('abc');
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}));
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it('should set the context to the component instance', async(() => {
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const template =
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`<p *ngFor="let item of items; trackBy: trackByContext.bind(this)"></p>`;
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fixture = createTestComponent(template);
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thisArg = null;
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fixture.detectChanges();
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expect(thisArg).toBe(getComponent());
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}));
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it('should not replace tracked items', async(() => {
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const template =
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`<p *ngFor="let item of items; trackBy: trackById; let i=index">{{items[i]}}</p>`;
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fixture = createTestComponent(template);
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const buildItemList = () => {
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getComponent().items = [{'id': 'a'}];
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fixture.detectChanges();
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return fixture.debugElement.queryAll(By.css('p'))[0];
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};
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const firstP = buildItemList();
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const finalP = buildItemList();
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expect(finalP.nativeElement).toBe(firstP.nativeElement);
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}));
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it('should update implicit local variable on view', async(() => {
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const template =
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`<div *ngFor="let item of items; trackBy: trackById">{{item['color']}}</div>`;
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fixture = createTestComponent(template);
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getComponent().items = [{'id': 'a', 'color': 'blue'}];
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detectChangesAndExpectText('blue');
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getComponent().items = [{'id': 'a', 'color': 'red'}];
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detectChangesAndExpectText('red');
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}));
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it('should move items around and keep them updated ', async(() => {
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const template =
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`<div *ngFor="let item of items; trackBy: trackById">{{item['color']}}</div>`;
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fixture = createTestComponent(template);
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getComponent().items = [{'id': 'a', 'color': 'blue'}, {'id': 'b', 'color': 'yellow'}];
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detectChangesAndExpectText('blueyellow');
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getComponent().items = [{'id': 'b', 'color': 'orange'}, {'id': 'a', 'color': 'red'}];
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detectChangesAndExpectText('orangered');
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}));
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it('should handle added and removed items properly when tracking by index', async(() => {
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const template = `<div *ngFor="let item of items; trackBy: trackByIndex">{{item}}</div>`;
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fixture = createTestComponent(template);
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getComponent().items = ['a', 'b', 'c', 'd'];
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fixture.detectChanges();
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getComponent().items = ['e', 'f', 'g', 'h'];
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fixture.detectChanges();
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getComponent().items = ['e', 'f', 'h'];
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detectChangesAndExpectText('efh');
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}));
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});
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});
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}
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class Foo {
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toString() {
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return 'foo';
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}
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}
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@Component({selector: 'test-cmp', template: ''})
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class TestComponent {
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value: any;
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items: any[] = [1, 2];
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trackById(index: number, item: any): string {
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return item['id'];
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}
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trackByIndex(index: number, item: any): number {
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return index;
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}
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trackByContext(): void {
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thisArg = this;
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}
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}
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const TEMPLATE = '<div><span *ngFor="let item of items">{{item.toString()}};</span></div>';
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function createTestComponent(template: string = TEMPLATE): ComponentFixture<TestComponent> {
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return TestBed.overrideComponent(TestComponent, {set: {template: template}})
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.createComponent(TestComponent);
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}
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