typescript - TypeError：无法读取未定义的属性“符号”[JWT / Nestjs / e2e 测试]

Question

我需要为我的 e2e 测试生成一个 Jwt Bearer Token。由于该过程有点乏味，并且因为这不是我要测试的内容，所以我想通过直接获取而不是通过 2FA 真实过程来绕过它。

不幸的是，我不断收到以下错误：

 TypeError: Cannot read property 'sign' of undefined

      150 |
      151 |     function getBearerToken(candidateId: number) {
    > 152 |       return jwtService.sign({ sub: candidateId.toString() })
          |                         ^
      153 |     }
      154 |   })
      155 | })

      at getBearerToken (app.e2e-spec.ts:152:25)
      at Object.<anonymous> (app.e2e-spec.ts:127:21)

describe('Bookmarks Module', () => {
    let bearerToken: string
    let jwtService: JwtService

    beforeEach(() => {
      bearerToken = getBearerToken(1)
      jwtService = new JwtService({
        secret: process.env.JWT_SECRET,
        signOptions: { expiresIn: '1h' },
      })
    })

    test('/v1/bookmarks/ (GET) [auth]', () => {
      return expectCorrectAuthenticatedGetResponse(
        `${V1_PREFIX}/bookmarks/`,
        bearerToken
      )
    })

    test('/v1/bookmarks/{id} (POST) [auth]', () => {
      const DATA = { offerId: 19 }
      return expectCorrectAuthenticatedPostResponse(
        `${V1_PREFIX}/bookmarks/${DATA.offerId}`,
        DATA,
        bearerToken
      )
    })

    function getBearerToken(candidateId: number) {
      return jwtService.sign({ sub: candidateId.toString() })
    }
  })

Answer 1

你调用jwtService.sign()in getBearerToken()which 本身就是调用 in beforeEach()，就在jwtService被初始化之前。当您尝试使用它时jwtService仍然如此。undefined您应该反转以下行beforeEach()：

    beforeEach(() => {
      jwtService = new JwtService({
        secret: process.env.JWT_SECRET,
        signOptions: { expiresIn: '1h' },
      })
      bearerToken = getBearerToken(1)
    })