前端——前端核心技术要点深度解析 之 【前端测试体系构建】

前端测试包括单元测试、集成测试和端到端测试三个层次各有侧重。重点难点测试金字塔单元测试、集成测试、端到端测试的比例分配Mock 策略如何恰当地模拟依赖项测试覆盖率有意义的覆盖率指标设定// 单元测试示例 (Jest)describe(Calculator,(){beforeEach((){// 测试前准备})afterEach((){// 测试后清理})test(should add two positive numbers correctly,(){expect(add(2,3)).toBe(5)})test(should handle negative numbers,(){expect(add(-1,1)).toBe(0)})test(should throw error for invalid inputs,(){expect(()add(a,b)).toThrow(Invalid input)})})// 组件测试示例 (Vue Test Utils)import{mount}fromvue/test-utilsimportButtonfrom/components/Button.vuedescribe(Button,(){test(renders correctly with props,(){constwrappermount(Button,{props:{type:primary,disabled:false},slots:{default:Click me}})expect(wrapper.text()).toContain(Click me)expect(wrapper.classes()).toContain(btn-primary)expect(wrapper.attributes(disabled)).toBeUndefined()})test(emits click event when clicked,async(){constwrappermount(Button)awaitwrapper.trigger(click)expect(wrapper.emitted(click)).toHaveLength(1)})})