例子：

我的service class里有一個protected方法，我想在單元測試里對其進行測試：

一種思路是，可以沿用Java里測試protected方法的變通方式，即創建一個新的sub class，繼承包含該protected方法的class，然后在子類里新建一個公有方法作為wrapper之用，實現邏輯只有一行，就是調用父類的protected方法。

例子如下：

這樣，我只需要對子類的公有方法進行單元測試即可測試到父類的protected方法。

完整源代碼：

import { Injectable } from '@angular/core'; import { TestBed } from '@angular/core/testing'; import { EntitiesModel } from '@spartacus/core'; import {B2BUnitNode,B2BUnitTreeNode,OrgUnitService, } from '@spartacus/organization/administration/core'; import { TableService, TableStructure } from '@spartacus/storefront'; import { BehaviorSubject, Observable, of } from 'rxjs'; import { UnitItemService } from './unit-item.service'; import { UnitListService } from './unit-list.service'; import { TREE_TOGGLE } from './unit-tree.model'; import { UnitTreeService } from './unit-tree.service';import createSpy = jasmine.createSpy;function verifyExpandedAll({ values }: EntitiesModel<B2BUnitTreeNode>) {expect(values.length).toEqual(7);values.forEach((element) => {expect(element.expanded).toBeTrue();}); }function verifyCollapsedAll({ values }: EntitiesModel<B2BUnitTreeNode>) {const root = values[0];expect(values.length).toEqual(1);expect(root.uid).toEqual(mockedTree.id);expect(root.expanded).toBeFalse();expect(root.depthLevel).toEqual(0);expect(root.count).toEqual(mockedTree.children.length); }const codeKey = 'uid';const mockedTree = {id: 'Rustic',name: 'Rustic',active: true,children: [{id: 'Rustic Services',name: 'Rustic Services',parent: 'Rustic',active: true,children: [{active: true,children: [],id: 'Services West',name: 'Services West',parent: 'Rustic Services',},{active: true,children: [],id: 'Services East',name: 'Services East',parent: 'Rustic Services',},],},{id: 'Rustic Retail',name: 'Rustic Retail',parent: 'Rustic',active: true,children: [{active: true,id: 'Custom Retail',name: 'Custom Retail',parent: 'Rustic Retail',children: [{active: true,children: [],id: 'Test',name: 'TestUnit',parent: 'Custom Retail',},],},],},], };const mockedTreeBeforeConvert = {id: 'Rustic',name: 'Rustic',active: true,children: [{id: 'test3',name: 'test3',parent: 'Rustic',active: true,children: [],},{id: 'test1',name: 'test1',parent: 'Rustic',active: true,children: [],},{id: 'test2',name: 'test2',parent: 'Rustic',active: true,children: [],},], };const mockedTreeAfterConvert = {pagination: {totalResults: 4,},values: [{active: true,children: [{id: 'test1',name: 'test1',parent: 'Rustic',active: true,children: [],},{id: 'test2',name: 'test2',parent: 'Rustic',active: true,children: [],},{id: 'test3',name: 'test3',parent: 'Rustic',active: true,children: [],},],count: 3,depthLevel: 0,expanded: false,id: 'Rustic',name: 'Rustic',uid: 'Rustic',},], };const treeToggle$ = new BehaviorSubject(new Map().set(mockedTree.id, TREE_TOGGLE.EXPANDED) );class MockUnitService {getTree(): Observable<B2BUnitNode> {return of(mockedTree);} }@Injectable() export class MockTableService {buildStructure(type): Observable<TableStructure> {return of({ type });} }export class MockUnitTreeService {treeToggle$ = treeToggle$.asObservable();initialize = createSpy('initialize');getToggleState = createSpy('getToggleState').withArgs(mockedTree.id).and.returnValue(treeToggle$.value?.get(mockedTree.id));isExpanded = createSpy('isExpanded').and.returnValue(false); }export class UnitListServiceForSortTest extends UnitListService {public convertListItemWrapper(unit: B2BUnitNode) {return this.convertListItem(unit);} }describe('UnitListService', () => {let service: UnitListService;let treeService: UnitTreeService;describe('with table config', () => {beforeEach(() => {TestBed.configureTestingModule({providers: [{provide: UnitListService,useClass: UnitListServiceForSortTest,},{provide: UnitTreeService,useClass: MockUnitTreeService,},{provide: OrgUnitService,useClass: MockUnitService,},{provide: TableService,useClass: MockTableService,},{provide: UnitItemService,useValue: {key$: of(mockedTree.id),},},],});service = TestBed.inject(UnitListService);treeService = TestBed.inject(UnitTreeService);});it('should inject service', () => {expect(service).toBeTruthy();});it('should return "code" key', () => {expect(service.key()).toEqual(codeKey);});it('should get collapsed all items structure', () => {let result: EntitiesModel<B2BUnitTreeNode>;service.getData().subscribe((table) => (result = table));verifyCollapsedAll(result);});it('should get expanded all items structure', () => {let result: EntitiesModel<B2BUnitTreeNode>;treeService.isExpanded = createSpy().and.returnValue(true);service.getData().subscribe((table) => (result = table));verifyExpandedAll(result);});it('should automatically sort unit tree by name', () => {const serviceForSort = service as UnitListServiceForSortTest;const convertedTree = serviceForSort.convertListItemWrapper(mockedTreeBeforeConvert);expect(convertedTree).toEqual(mockedTreeAfterConvert);});}); });

更多Jerry的原創文章，盡在：“汪子熙”:

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