Jest 和 Typescript:无法检查对象是否是 class 的实例
Jest and Typescript: Unable to check if object is instance of class
我需要检查该方法是否正在返回 class 的实例,但我有点迷路了。
当我 运行 测试时,我得到 ReferenceError
。
Mapper.spec.js:
import { SetConfigurationRequestModel } from '../../usecases/Models/SetConfigurationRequestModel'
import { ISetConfigurationRequest } from '../requests/ISetConfigurationRequest'
import { Mapper } from './Mapper'
describe('Helpers/Mappers', () => {
describe('cfgRequest2RequestModel', () => {
test('should exist', () => {
const sut = new Mapper()
expect(sut.cfgRequest2RequestModel).toBeTruthy()
})
test('should be a method', () => {
const sut = new Mapper()
expect(typeof sut.cfgRequest2RequestModel).toBe('function')
})
test('should return a RequestModel', () => {
const sut = new Mapper()
const fakeRequest = makeFakeRequest()
const requestModel = sut.cfgRequest2RequestModel(fakeRequest)
expect(requestModel).toBeInstanceOf(SetConfigurationRequestModel)
})
})
})
Mapper.js:
import { SetConfigurationRequestModel } from '../../usecases/Models/SetConfigurationRequestModel'
import { ISetConfigurationRequest } from '../requests/ISetConfigurationRequest'
export class Mapper {
cfgRequest2RequestModel (request: ISetConfigurationRequest): object {
const request2 = new SetConfigurationRequestModel()
return request2
}
}
笑话输出:
FAIL src/delivery/helpers/mappers.spec.ts
● Helpers/Mappers › cfgRequest2RequestModel › should return a RequestModel
ReferenceError: SetConfigurationRequestModel is not defined
4 | export class Mapper {
5 | cfgRequest2RequestModel (request: ISetConfigurationRequest): object {
> 6 | const request2 = new SetConfigurationRequestModel()
| ^
7 | return request2
8 | }
9 | }
at Mapper.cfgRequest2RequestModel (src/delivery/helpers/Mapper.ts:6:22)
at Object.<anonymous> (src/delivery/helpers/mappers.spec.ts:42:32)```
问题与代码无关。
以防万一有人遇到同样的情况,请向 jest 命令添加 --no-cache
选项。