Javascript Jest测试的类型不正确。每个

所以我用它来运行一些单元测试

以下是实际代码：

const invalidTestCases = [
  [null, TypeError],
  [undefined, TypeError],
  [false, TypeError],
  [true, TypeError],
];

describe('normalizeNames', () => {
  describe('invalid', () => {
    test.each(invalidTestCases)('some description for (%p, %p)', (actual, expected) => {
      expect(() => normalizeNames(actual as any)).toThrowError(expected);
    });
  });

  describe('valid', () => {
    // ...
  });
});

问题是，由于typescript错误，我无法运行此操作：

Argument of type '(actual: boolean | TypeErrorConstructor | null | undefined, expected: boolean | TypeErrorConstructor | null | undefined) => void' is not assignable to parameter of type '(...args: (TypeErrorConstructor | null)[] | (TypeErrorConstructor | undefined)[] | (boolean | TypeErrorConstructor)[]) => any'.
      Types of parameters 'actual' and 'args' are incompatible.
        Type '(TypeErrorConstructor | null)[] | (TypeErrorConstructor | undefined)[] | (boolean | TypeErrorConstructor)[]' is not assignable to type '[boolean | TypeErrorConstructor | null | undefined, boolean | TypeErrorConstructor | null | undefined]'.
          Type '(TypeErrorConstructor | null)[]' is missing the following properties from type '[boolean | TypeErrorConstructor | null | undefined, boolean | TypeErrorConstructor | null | undefined]': 0, 1
           test.each(invalidTestCases)('some description for (%p, %p)', (actual, expected) => {
                                                       ~~~~~~~~~~~~~~~~~~~~~~~

---

我还尝试使用

对象的
数组
，而不是2d
数组
，如下所示：

const invalidTestCases = [
  { actual: null, expected: TypeError },
  { actual: undefined, expected: TypeError },
  { actual: false, expected: TypeError },
  { actual: true, expected: TypeError },
];

describe('normalizeNames', () => {
  describe('invalid', () => {
    test.each(invalidTestCases)('some description for (%p, %p)', ({ actual, expected }) => {
      expect(() => normalizeNames(actual as any)).toThrowError(expected);
    });
  });

  describe('valid', () => {
    // ...
  });
});

const invalidTestCases = [
  null,
  undefined,
  false,
  true,
];

describe('normalizeNames', () => {
  describe('invalid', () => {
    test.each(invalidTestCases)('some description for (%p)', actual => {
      expect(() => normalizeNames(actual as any)).toThrowError(TypeError);
    });
  });

  describe('valid', () => {
    // ...
  });
});

…但这样做，我无法获得
对象
值的正确测试描述。
我目前无法测试它，但添加类型注释通常可以修复该错误

因此，不妨尝试：

type testCaseErrorTypes=null |未定义|布尔值
const invalidTestCases:[testCaseErrorTypes，typeof TypeError][]=[
[null，TypeError]，
[未定义，类型错误]，
[错误，类型错误]，
[正确，类型错误]，
];
test.each（invalidTestCases）（“对（%p，%p）的一些描述），（实际的，预期的）=>{…}

这应该将
invalidTestCases
从
（testCaseErrorTypes | TypeError）[[]
转换为正确的类型
[testCaseErrorTypes，TypeError][]
由于所有的
期望值都相等，因此您可以使用1d数组并直接将
TypeError
传递给
tothrower
。如下所示：

const invalidTestCases = [
  { actual: null, expected: TypeError },
  { actual: undefined, expected: TypeError },
  { actual: false, expected: TypeError },
  { actual: true, expected: TypeError },
];

describe('normalizeNames', () => {
  describe('invalid', () => {
    test.each(invalidTestCases)('some description for (%p, %p)', ({ actual, expected }) => {
      expect(() => normalizeNames(actual as any)).toThrowError(expected);
    });
  });

  describe('valid', () => {
    // ...
  });
});

const invalidTestCases = [
  null,
  undefined,
  false,
  true,
];

describe('normalizeNames', () => {
  describe('invalid', () => {
    test.each(invalidTestCases)('some description for (%p)', actual => {
      expect(() => normalizeNames(actual as any)).toThrowError(TypeError);
    });
  });

  describe('valid', () => {
    // ...
  });
});

TypeError
不满足typescript类型，但
typeof TypeError
满足。此外，由于回调参数是自动推断出来的，您不需要键入这些参数。@developer033是的，我的错。但这能解决您的问题吗？（当然，一旦应用了您对它的修复）@SourceOverflow我是OP:）但你的两个解决方案对我都有效。。。谢谢哦，对了，显然我看不懂，不过很高兴它起作用了。我将用@developer033的更改更新答案