---
url: /docs/guide/usage/linter/rules/jest/prefer-hooks-in-order.md
---

### 它的作用

确保 hooks 的顺序与它们被调用的顺序一致。

### 为什么这不好？

虽然 hooks 可以按任意顺序设置，但 `jest` 总是按以下特定顺序调用它们：

1. `beforeAll`
2. `beforeEach`
3. `afterEach`
4. `afterAll`

此规则通过强制将分组的 hooks 按照该顺序在测试中设置，来使这一点更加明显。

### 示例

以下是此规则的**错误**代码示例：

```javascript
describe("foo", () => {
  beforeEach(() => {
    seedMyDatabase();
  });
  beforeAll(() => {
    createMyDatabase();
  });
  it("accepts this input", () => {
    // ...
  });
  it("returns that value", () => {
    // ...
  });
  describe("when the database has specific values", () => {
    const specificValue = "...";
    beforeEach(() => {
      seedMyDatabase(specificValue);
    });
    it("accepts that input", () => {
      // ...
    });
    it("throws an error", () => {
      // ...
    });
    afterEach(() => {
      clearLogger();
    });
    beforeEach(() => {
      mockLogger();
    });
    it("logs a message", () => {
      // ...
    });
  });
  afterAll(() => {
    removeMyDatabase();
  });
});
```

以下是此规则的**正确**代码示例：

```javascript
describe("foo", () => {
  beforeAll(() => {
    createMyDatabase();
  });
  beforeEach(() => {
    seedMyDatabase();
  });
  it("accepts this input", () => {
    // ...
  });
  it("returns that value", () => {
    // ...
  });
  describe("when the database has specific values", () => {
    const specificValue = "...";
    beforeEach(() => {
      seedMyDatabase(specificValue);
    });
    it("accepts that input", () => {
      // ...
    });
    it("throws an error", () => {
      // ...
    });
    beforeEach(() => {
      mockLogger();
    });
    afterEach(() => {
      clearLogger();
    });
    it("logs a message", () => {
      // ...
    });
  });
  afterAll(() => {
    removeMyDatabase();
  });
});
```

## 如何使用

## 版本

此规则在 v0.6.0 中添加。

## 参考资料