noDuplicateTestHooks

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JavaScript (and super languages)

Summary

Rule available since: v1.6.0
Diagnostic Category: lint/suspicious/noDuplicateTestHooks
This rule doesn’t have a fix.
The default severity of this rule is error.
This rule belongs to the following domains:
- test
Sources:
- Inspired from jest/no-duplicate-hooks
- Inspired from vitest/no-duplicate-hooks

How to configure

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{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "noDuplicateTestHooks": "error"
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      }
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    }
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  }
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}

Description

A describe block should not contain duplicate hooks.

Examples

Invalid

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describe('foo', () => {
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  beforeEach(() => {
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    // some setup
4
  });
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  beforeEach(() => {
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    // some setup
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  });
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  test('foo_test', () => {
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   // some test
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  });
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});

code-block.js:5:3 lint/suspicious/noDuplicateTestHooks ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The test hook beforeEach is used multiple times in the same test block.
  
    3 │     // some setup
    4 │   });
  > 5 │   beforeEach(() => {
      │   ^^^^^^^^^^^^^^^^^^
  > 6 │     // some setup
  > 7 │   });
      │   ^^
    8 │   test(‘foo_test’, () => {
    9 │    // some test
  
  ℹ The presence of the same hook more than once in the same test block can create unexpected errors inside tests. Remove one of them.

1
describe('foo', () => {
2
  beforeEach(() => {
3
    // some setup
4
  });
5
  test('foo_test', () => {
6
    afterAll(() => {
7
      // some teardown
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    });
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   afterAll(() => {
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     // some teardown
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   });
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  });
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});

code-block.js:9:4 lint/suspicious/noDuplicateTestHooks ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The test hook afterAll is used multiple times in the same test block.
  
     7 │       // some teardown
     8 │     });
   > 9 │    afterAll(() => {
       │    ^^^^^^^^^^^^^^^^
  > 10 │      // some teardown
  > 11 │    });
       │    ^^
    12 │   });
    13 │ });
  
  ℹ The presence of the same hook more than once in the same test block can create unexpected errors inside tests. Remove one of them.

Valid

1
describe('foo', () => {
2
  beforeEach(() => {
3
    // some setup
4
  });
5
  test('foo_test', () => {
6
    // some test
7
  });
8
});

noDuplicateTestHooks

Summary

How to configure

Description

Examples

Invalid

Valid

Related links