angular-docs-cn/packages/common/test/pipes/i18n_plural_pipe_spec.ts

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/**
* @license
* Copyright Google LLC 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 {I18nPluralPipe, NgLocalization} from '@angular/common';
import {PipeResolver} from '@angular/compiler/src/pipe_resolver';
import {beforeEach, describe, expect, it} from '@angular/core/testing/src/testing_internal';
import {JitReflector} from '@angular/platform-browser-dynamic/src/compiler_reflector';
{
describe('I18nPluralPipe', () => {
let localization: NgLocalization;
let pipe: I18nPluralPipe;
const mapping = {
'=0': 'No messages.',
'=1': 'One message.',
'many': 'Many messages.',
'other': 'There are # messages, that is #.',
};
beforeEach(() => {
localization = new TestLocalization();
pipe = new I18nPluralPipe(localization);
});
it('should be marked as pure', () => {
expect(new PipeResolver(new JitReflector()).resolve(I18nPluralPipe)!.pure).toEqual(true);
});
describe('transform', () => {
it('should return 0 text if value is 0', () => {
const val = pipe.transform(0, mapping);
expect(val).toEqual('No messages.');
});
it('should return 1 text if value is 1', () => {
const val = pipe.transform(1, mapping);
expect(val).toEqual('One message.');
});
it('should return category messages', () => {
const val = pipe.transform(4, mapping);
expect(val).toEqual('Many messages.');
});
it('should interpolate the value into the text where indicated', () => {
const val = pipe.transform(6, mapping);
expect(val).toEqual('There are 6 messages, that is 6.');
});
it('should use "" if value is undefined', () => {
const val = pipe.transform(void (0) as any, mapping);
expect(val).toEqual('');
});
it('should not support bad arguments', () => {
expect(() => pipe.transform(0, <any>'hey')).toThrowError();
});
});
});
}
class TestLocalization extends NgLocalization {
getPluralCategory(value: number): string {
return value > 1 && value < 6 ? 'many' : 'other';
}
}