Question

我有一个抛出一个对象的函数，我怎么能断言正确的对象被抛出？

it('should throw', () => {

  const errorObj = {
    myError: {
      name: 'myError',
      desc: 'myDescription'
    }
  };

  const fn = () => {
    throw errorObj;
  }

  expect(() => fn()).toThrowError(errorObj);
});

https://repl.it/repls/FrayedViolentBoa

Answer 1

如果您要测试自定义错误的内容（我认为您正在尝试这样做）。您可以捕获错误然后执行断言。

it('should throw', () => {
 let thrownError;

 try {
   fn();
 }
 catch(error) {
  thrownError = error;
 }

 expect(thrownError).toEqual(expectedErrorObj);
});

正如Dez所说，如果你不抛出一个javascript Error对象的实例，那么toThrowError函数将不起作用。但是，您可以通过装饰错误对象的实例来创建自定义错误。

e.g。

let myError = new Error('some message');
myError.data = { name: 'myError',
                 desc: 'myDescription' };
throw myError;

然后，一旦您在测试中发现错误，您就可以测试错误的自定义内容。

expect(thrownError.data).toEqual({ name: 'myError',
                                   desc: 'myDescription' });

Answer 2

您需要抛出一个Javascript Option Explicit Sub CompletionStatusUpdate() Dim CompletionStatus As Range Dim wb As Workbook Set wb = ThisWorkbook Dim ws1 As Worksheet Set ws1 = wb.Sheets("One") Dim ws2 As Worksheet Set ws2 = wb.Sheets("Two") Dim h9Range As Range Set h9Range = ws1.Range("H9") 'Test for h9Range being not empty and that is greater than 2? ws2.Range("H2:H" & h9Range.Value + 1).Interior.ColorIndex = 0 'if this is intended to clear prior runs it needs + 1 ws2.Range("H2:H" & h9Range.Value + 1).ClearContents 'This seems to be the same as loopRange? Dim completeRange As Range Set completeRange = ws1.Range("H11") Dim missingRange As Range Set missingRange = ws1.Range("H13") missingRange.ClearContents completeRange.ClearContents Dim h8Range As Range Set h8Range = ws1.Range("H8") Dim dRange As Range Set dRange = ws2.Range("D" & h9Range.Value) Dim fRange As Range Set fRange = ws2.Range("F" & h9Range.Value) Dim countRange As Range Set countRange = ws2.Range("H2:H" & h9Range.Value + 1) Dim h6Range As Range Set h6Range = ws1.Range("H6") Dim loopRange As Range Set loopRange = ws2.Range("H2:H" & h9Range.Value + 1).SpecialCells(xlCellTypeVisible) DataGetCompletion = 3 If dRange = "Yes" And fRange = "Yes" Then h8Range = 1 ElseIf dRange = "No" And fRange = "No" Then h8Range = 2 Else h8Range = 3 End If For Each CompletionStatus In loopRange If CompletionStatus.EntireRow.Hidden = False Then Select Case h8Range Case 1 CompletionStatus.Interior.ColorIndex = 4 CompletionStatus.Value = "Both data sets complete" Case 2 CompletionStatus.Interior.ColorIndex = 3 CompletionStatus.Value = "Both data sets missing" End Select End If Next CompletionStatus completeRange = Application.WorksheetFunction.CountIf _ (countRange, "Both data sets complete") missingRange = Application.WorksheetFunction.CountIf _ (countRange, "Both data sets missing") End Sub对象，因此Jest Error方法会识别出已抛出错误。此外，toThrowError看起来与所引发错误的消息相匹配，或者如果您只是通过toThrowError进行检查，则会抛出错误。

.toThrowError()

如果要检查整个对象是否按原样传递，则需要像这样检查：

it('should throw', () => {

  const errorObj = {
    myError: {
      name: 'myError',
      desc: 'myDescription'
    }
  };

  const fn = () => {
    throw new Error(errorObj.myError.desc);
  }

  expect(() => fn()).toThrowError("myDescription");
});

Answer 3

这是开玩笑的已知问题，请参见https://github.com/facebook/jest/issues/8140

同时，这是我的解决方法-https://github.com/DanielHreben/jest-matcher-specific-error

在jest中声明抛出错误对象

3 个答案: