Question

这是我的错误代码：

 FAIL  build/__test__/FuncOps.CheckFunctionExistenceByString.test.js
  ● 
    expect(CheckFunctionExistenceByStr(
      'any string', 'FunctionThatDoesNotExistsInString'
    )).toThrow();


    Function FunctionThatDoesNotExistsInString does not exists in string.

      at CheckFunctionExistenceByStr (build/FuncOps.js:35:15)
      at Object.<anonymous> (build/__test__/FuncOps.CheckFunctionExistenceByString.test.js:12:51)
          at new Promise (<anonymous>)
          at <anonymous>

正如您所看到的，确实发生了错误：Function FunctionThatDoesNotExistsInString does not exists in string.。然而，它并没有作为Jest中的传球被捕获。

这是我的代码：

test(`
    expect(CheckFunctionExistenceByStr(
      'any string', 'FunctionThatDoesNotExistsInString'
    )).toThrow();
  `, () => {
    expect(CheckFunctionExistenceByStr(
      'any string', 'FunctionThatDoesNotExistsInString'
    )).toThrow();
  }
);

Answer 1

:s3_credentials => "#{Rails.root}/config/aws.yml"需要一个函数expect(fn).toThrow()，在调用时会抛出异常。

但是你正在调用fn immediatelly，这导致函数在运行断言之前抛出。

替换

CheckFunctionExistenceByStr

与

test(`
    expect(CheckFunctionExistenceByStr(
      'any string', 'FunctionThatDoesNotExistsInString'
    )).toThrow();
  `, () => {
    expect(CheckFunctionExistenceByStr(
      'any string', 'FunctionThatDoesNotExistsInString'
    )).toThrow();
  }
);

Answer 2

是的，这只是 Jest 很奇怪。而不是做：

expect(youFunction(args)).toThrow(ErrorTypeOrErrorMessage)

这样做：

expect(() => youFunction(args)).toThrow(ErrorTypeOrErrorMessage)

抛出错误但是Jest的`toThrow（）`没有捕获错误

2 个答案: