3b919ef10f
I18nPluralPipe can actually accept `null` and `undefined` (which are convenient for composing it with the async pipe), but it is currently typed to only accept `number`. PR Close #37447
78 lines
2.3 KiB
TypeScript
78 lines
2.3 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 {I18nPluralPipe, NgLocalization} from '@angular/common';
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import {PipeResolver} from '@angular/compiler/src/pipe_resolver';
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import {beforeEach, describe, expect, it} from '@angular/core/testing/src/testing_internal';
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import {JitReflector} from '@angular/platform-browser-dynamic/src/compiler_reflector';
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{
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describe('I18nPluralPipe', () => {
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let localization: NgLocalization;
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let pipe: I18nPluralPipe;
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const mapping = {
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'=0': 'No messages.',
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'=1': 'One message.',
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'many': 'Many messages.',
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'other': 'There are # messages, that is #.',
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};
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beforeEach(() => {
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localization = new TestLocalization();
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pipe = new I18nPluralPipe(localization);
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});
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it('should be marked as pure', () => {
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expect(new PipeResolver(new JitReflector()).resolve(I18nPluralPipe)!.pure).toEqual(true);
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});
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describe('transform', () => {
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it('should return 0 text if value is 0', () => {
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const val = pipe.transform(0, mapping);
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expect(val).toEqual('No messages.');
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});
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it('should return 1 text if value is 1', () => {
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const val = pipe.transform(1, mapping);
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expect(val).toEqual('One message.');
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});
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it('should return category messages', () => {
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const val = pipe.transform(4, mapping);
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expect(val).toEqual('Many messages.');
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});
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it('should interpolate the value into the text where indicated', () => {
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const val = pipe.transform(6, mapping);
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expect(val).toEqual('There are 6 messages, that is 6.');
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});
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it('should use "" if value is undefined', () => {
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const val = pipe.transform(undefined, mapping);
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expect(val).toEqual('');
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});
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it('should use "" if value is null', () => {
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const val = pipe.transform(null, mapping);
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expect(val).toEqual('');
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});
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it('should not support bad arguments', () => {
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expect(() => pipe.transform(0, 'hey' as any)).toThrowError();
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});
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});
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});
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}
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class TestLocalization extends NgLocalization {
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getPluralCategory(value: number): string {
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return value > 1 && value < 6 ? 'many' : 'other';
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}
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}
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