angular-cn/packages/common/test/pipes/keyvalue_pipe_spec.ts

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/**
* @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 {KeyValuePipe} from '@angular/common';
import {EventEmitter, KeyValueDiffers, WrappedValue, ɵdefaultKeyValueDiffers as defaultKeyValueDiffers} from '@angular/core';
import {AsyncTestCompleter, beforeEach, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';
import {getDOM} from '@angular/platform-browser/src/dom/dom_adapter';
import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';
import {defaultComparator} from '../../src/pipes/keyvalue_pipe';
import {SpyChangeDetectorRef} from '../spies';
describe('KeyValuePipe', () => {
it('should return null when given null', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(null)).toEqual(null);
});
it('should return null when given undefined', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(undefined as any)).toEqual(null);
});
it('should return null for an unsupported type', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const fn = () => {};
expect(pipe.transform(fn as any)).toEqual(null);
});
describe('object dictionary', () => {
it('should transform a basic dictionary', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform({1: 2})).toEqual([{key: '1', value: 2}]);
});
it('should order by alpha', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform({'b': 1, 'a': 1})).toEqual([
{key: 'a', value: 1}, {key: 'b', value: 1}
]);
});
it('should order by numerical', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform({2: 1, 1: 1})).toEqual([{key: '1', value: 1}, {key: '2', value: 1}]);
});
it('should order by numerical and alpha', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const input = {2: 1, 1: 1, 'b': 1, 0: 1, 3: 1, 'a': 1};
expect(pipe.transform(input)).toEqual([
{key: '0', value: 1}, {key: '1', value: 1}, {key: '2', value: 1}, {key: '3', value: 1},
{key: 'a', value: 1}, {key: 'b', value: 1}
]);
});
it('should return the same ref if nothing changes', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const transform1 = pipe.transform({1: 2});
const transform2 = pipe.transform({1: 2});
expect(transform1 === transform2).toEqual(true);
});
it('should return a new ref if something changes', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const transform1 = pipe.transform({1: 2});
const transform2 = pipe.transform({1: 3});
expect(transform1 !== transform2).toEqual(true);
});
});
describe('Map', () => {
it('should transform a basic Map', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(new Map([[1, 2]]))).toEqual([{key: 1, value: 2}]);
});
it('should order by alpha', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(new Map([['b', 1], ['a', 1]]))).toEqual([
{key: 'a', value: 1}, {key: 'b', value: 1}
]);
});
it('should order by numerical', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
expect(pipe.transform(new Map([[2, 1], [1, 1]]))).toEqual([
{key: 1, value: 1}, {key: 2, value: 1}
]);
});
it('should order by numerical and alpha', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const input = [[2, 1], [1, 1], ['b', 1], [0, 1], [3, 1], ['a', 1]];
expect(pipe.transform(new Map(input as any))).toEqual([
{key: 0, value: 1}, {key: 1, value: 1}, {key: 2, value: 1}, {key: 3, value: 1},
{key: 'a', value: 1}, {key: 'b', value: 1}
]);
});
it('should order by complex types with compareFn', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const input = new Map([[{id: 1}, 1], [{id: 0}, 1]]);
expect(pipe.transform<{id: number}, number>(input, (a, b) => a.key.id > b.key.id ? 1 : -1))
.toEqual([
{key: {id: 0}, value: 1},
{key: {id: 1}, value: 1},
]);
});
it('should return the same ref if nothing changes', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const transform1 = pipe.transform(new Map([[1, 2]]));
const transform2 = pipe.transform(new Map([[1, 2]]));
expect(transform1 === transform2).toEqual(true);
});
it('should return a new ref if something changes', () => {
const pipe = new KeyValuePipe(defaultKeyValueDiffers);
const transform1 = pipe.transform(new Map([[1, 2]]));
const transform2 = pipe.transform(new Map([[1, 3]]));
expect(transform1 !== transform2).toEqual(true);
});
});
});
describe('defaultComparator', () => {
it('should remain the same order when keys are equal', () => {
const key = 1;
const values = [{key, value: 2}, {key, value: 1}];
expect(values.sort(defaultComparator)).toEqual(values);
});
it('should sort undefined keys to the end', () => {
const values = [{key: 3, value: 1}, {key: undefined, value: 3}, {key: 1, value: 2}];
expect(values.sort(defaultComparator)).toEqual([
{key: 1, value: 2}, {key: 3, value: 1}, {key: undefined, value: 3}
]);
});
it('should sort null keys to the end', () => {
const values = [{key: 3, value: 1}, {key: null, value: 3}, {key: 1, value: 2}];
expect(values.sort(defaultComparator)).toEqual([
{key: 1, value: 2}, {key: 3, value: 1}, {key: null, value: 3}
]);
});
it('should sort strings in alpha ascending', () => {
const values = [{key: 'b', value: 1}, {key: 'a', value: 3}];
expect(values.sort(defaultComparator)).toEqual([{key: 'a', value: 3}, {key: 'b', value: 1}]);
});
it('should sort numbers in numerical ascending', () => {
const values = [{key: 2, value: 1}, {key: 1, value: 3}];
expect(values.sort(defaultComparator)).toEqual([{key: 1, value: 3}, {key: 2, value: 1}]);
});
it('should sort boolean in false (0) -> true (1)', () => {
const values = [{key: true, value: 3}, {key: false, value: 1}];
expect(values.sort(defaultComparator)).toEqual([{key: false, value: 1}, {key: true, value: 3}]);
});
it('should sort numbers as strings in numerical ascending', () => {
const values = [{key: '2', value: 1}, {key: 1, value: 3}];
expect(values.sort(defaultComparator)).toEqual([{key: 1, value: 3}, {key: '2', value: 1}]);
});
});