Jest test.each 的类型不正确

Question

所以我用来Jest#test.each运行一些单元测试。

这是实际的代码：

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

问题是由于打字稿错误我无法运行它：

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arrayofobjects而不是 2d array，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', () => {
    // ...
  });
});

...但是这样做，我无法获得正确的object值测试描述。

Answer 1

我目前无法对其进行测试，但添加类型注释通常可以修复该错误。

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所以也许可以尝试：

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type testCaseErrorTypes = null|undefined|boolean\nconst invalidTestCases: [testCaseErrorTypes, typeof TypeError][] = [\n  [null, TypeError],\n  [undefined, TypeError],\n  [false, TypeError],\n  [true, TypeError],\n];\ntest.each(invalidTestCases)(\'some description for (%p, %p)\', (actual, expected) => { \xe2\x80\xa6 }\n

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invalidTestCases这应该从 a转换(testCaseErrorTypes|TypeError)[][]为正确的 type [testCaseErrorTypes, TypeError][]。

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