the-forest/client/node_modules/eslint-plugin-jest/docs/rules/prefer-hooks-on-top.md

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2024-09-17 20:35:18 -04:00
# Suggest having hooks before any test cases (`prefer-hooks-on-top`)
While hooks can be setup anywhere in a test file, they are always called in a
specific order which means it can be confusing if they're intermixed with test
cases.
This rule helps to ensure that hooks are always defined before test cases.
## Rule Details
Examples of **incorrect** code for this rule
```js
/* eslint jest/prefer-hooks-on-top: "error" */
describe('foo', () => {
beforeEach(() => {
seedMyDatabase();
});
it('accepts this input', () => {
// ...
});
beforeAll(() => {
createMyDatabase();
});
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();
});
});
```
Examples of **correct** code for this rule
```js
/* eslint jest/prefer-hooks-on-top: "error" */
describe('foo', () => {
beforeAll(() => {
createMyDatabase();
});
beforeEach(() => {
seedMyDatabase();
});
afterAll(() => {
clearMyDatabase();
});
it('accepts this input', () => {
// ...
});
it('returns that value', () => {
// ...
});
describe('when the database has specific values', () => {
const specificValue = '...';
beforeEach(() => {
seedMyDatabase(specificValue);
});
beforeEach(() => {
mockLogger();
});
afterEach(() => {
clearLogger();
});
it('accepts that input', () => {
// ...
});
it('throws an error', () => {
// ...
});
it('logs a message', () => {
// ...
});
});
});
```