angular-docs-cn/packages/common/test/directives/ng_plural_spec.ts

163 lines
5.7 KiB
TypeScript

/**
* @license
* Copyright Google Inc. 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 {CommonModule, NgLocalization} from '@angular/common';
import {Component, Injectable} from '@angular/core';
import {ComponentFixture, TestBed, async} from '@angular/core/testing';
import {expect} from '@angular/platform-browser/testing/src/matchers';
{
describe('ngPlural', () => {
let fixture: ComponentFixture<any>;
function getComponent(): TestComponent { return fixture.componentInstance; }
function detectChangesAndExpectText<T>(text: string): void {
fixture.detectChanges();
expect(fixture.nativeElement).toHaveText(text);
}
afterEach(() => { fixture = null !; });
beforeEach(() => {
TestBed.configureTestingModule({
declarations: [TestComponent],
providers: [{provide: NgLocalization, useClass: TestLocalization}],
imports: [CommonModule]
});
});
it('should display the template according to the exact value', async(() => {
const template = '<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="=0"><li>you have no messages.</li></ng-template>' +
'<ng-template ngPluralCase="=1"><li>you have one message.</li></ng-template>' +
'</ul>';
fixture = createTestComponent(template);
getComponent().switchValue = 0;
detectChangesAndExpectText('you have no messages.');
getComponent().switchValue = 1;
detectChangesAndExpectText('you have one message.');
}));
it('should display the template according to the exact numeric value', async(() => {
const template = '<div>' +
'<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="0"><li>you have no messages.</li></ng-template>' +
'<ng-template ngPluralCase="1"><li>you have one message.</li></ng-template>' +
'</ul></div>';
fixture = createTestComponent(template);
getComponent().switchValue = 0;
detectChangesAndExpectText('you have no messages.');
getComponent().switchValue = 1;
detectChangesAndExpectText('you have one message.');
}));
// https://github.com/angular/angular/issues/9868
// https://github.com/angular/angular/issues/9882
it('should not throw when ngPluralCase contains expressions', async(() => {
const template = '<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="=0"><li>{{ switchValue }}</li></ng-template>' +
'</ul>';
fixture = createTestComponent(template);
getComponent().switchValue = 0;
expect(() => fixture.detectChanges()).not.toThrow();
}));
it('should be applicable to <ng-container> elements', async(() => {
const template = '<ng-container [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="=0">you have no messages.</ng-template>' +
'<ng-template ngPluralCase="=1">you have one message.</ng-template>' +
'</ng-container>';
fixture = createTestComponent(template);
getComponent().switchValue = 0;
detectChangesAndExpectText('you have no messages.');
getComponent().switchValue = 1;
detectChangesAndExpectText('you have one message.');
}));
it('should display the template according to the category', async(() => {
const template = '<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="few"><li>you have a few messages.</li></ng-template>' +
'<ng-template ngPluralCase="many"><li>you have many messages.</li></ng-template>' +
'</ul>';
fixture = createTestComponent(template);
getComponent().switchValue = 2;
detectChangesAndExpectText('you have a few messages.');
getComponent().switchValue = 8;
detectChangesAndExpectText('you have many messages.');
}));
it('should default to other when no matches are found', async(() => {
const template = '<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="few"><li>you have a few messages.</li></ng-template>' +
'<ng-template ngPluralCase="other"><li>default message.</li></ng-template>' +
'</ul>';
fixture = createTestComponent(template);
getComponent().switchValue = 100;
detectChangesAndExpectText('default message.');
}));
it('should prioritize value matches over category matches', async(() => {
const template = '<ul [ngPlural]="switchValue">' +
'<ng-template ngPluralCase="few"><li>you have a few messages.</li></ng-template>' +
'<ng-template ngPluralCase="=2">you have two messages.</ng-template>' +
'</ul>';
fixture = createTestComponent(template);
getComponent().switchValue = 2;
detectChangesAndExpectText('you have two messages.');
getComponent().switchValue = 3;
detectChangesAndExpectText('you have a few messages.');
}));
});
}
@Injectable()
class TestLocalization extends NgLocalization {
getPluralCategory(value: number): string {
if (value > 1 && value < 4) {
return 'few';
}
if (value >= 4 && value < 10) {
return 'many';
}
return 'other';
}
}
@Component({selector: 'test-cmp', template: ''})
class TestComponent {
switchValue: number|null = null;
}
function createTestComponent(template: string): ComponentFixture<TestComponent> {
return TestBed.overrideComponent(TestComponent, {set: {template: template}})
.createComponent(TestComponent);
}