angular-docs-cn/modules/@angular/common/test/pipes/json_pipe_spec.ts

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import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach, inject,} from '@angular/core/testing/testing_internal';
import {AsyncTestCompleter} from '@angular/core/testing/testing_internal';
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import {TestComponentBuilder} from '@angular/compiler/testing';
import {Json, StringWrapper} from '../../src/facade/lang';
import {Component} from '@angular/core';
import {JsonPipe} from '@angular/common';
export function main() {
describe('JsonPipe', () => {
var regNewLine = '\n';
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var inceptionObj: any;
var inceptionObjString: string;
var pipe: JsonPipe;
function normalize(obj: string): string { return StringWrapper.replace(obj, regNewLine, ''); }
beforeEach(() => {
inceptionObj = {dream: {dream: {dream: 'Limbo'}}};
inceptionObjString = '{\n' +
' "dream": {\n' +
' "dream": {\n' +
' "dream": "Limbo"\n' +
' }\n' +
' }\n' +
'}';
pipe = new JsonPipe();
});
describe('transform', () => {
it('should return JSON-formatted string',
() => { expect(pipe.transform(inceptionObj)).toEqual(inceptionObjString); });
it('should return JSON-formatted string even when normalized', () => {
var dream1 = normalize(pipe.transform(inceptionObj));
var dream2 = normalize(inceptionObjString);
expect(dream1).toEqual(dream2);
});
it('should return JSON-formatted string similar to Json.stringify', () => {
var dream1 = normalize(pipe.transform(inceptionObj));
var dream2 = normalize(Json.stringify(inceptionObj));
expect(dream1).toEqual(dream2);
});
});
describe('integration', () => {
it('should work with mutable objects',
inject(
[TestComponentBuilder, AsyncTestCompleter],
(tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
tcb.createAsync(TestComp).then((fixture) => {
let mutable: number[] = [1];
fixture.debugElement.componentInstance.data = mutable;
fixture.detectChanges();
expect(fixture.debugElement.nativeElement).toHaveText('[\n 1\n]');
mutable.push(2);
fixture.detectChanges();
expect(fixture.debugElement.nativeElement).toHaveText('[\n 1,\n 2\n]');
async.done();
});
}));
});
});
}
@Component({selector: 'test-comp', template: '{{data | json}}', pipes: [JsonPipe]})
class TestComp {
data: any;
}