noIdenticalTestTitle

JavaScript (and super languages)

Summary

Rule available since: v2.4.12
Diagnostic Category: lint/nursery/noIdenticalTestTitle
This rule doesn’t have a fix.
The default severity of this rule is warning.
This rule belongs to the following domains:
- test
Sources:
- Same as jest/no-identical-title
- Same as vitest/no-identical-title

How to configure

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noIdenticalTestTitle": "error"
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      }
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    }
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  }
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}

Description

Disallow identical titles in test suites and test cases.

Having identical titles for two different tests or test suites at the same level may create confusion. For example, when a test fails it is hard to tell which test exactly failed based on its title alone.

Examples

Invalid

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it('should do bar', () => {});
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it('should do bar', () => {});

code-block.js:2:1 lint/nursery/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Duplicate test title found.
  
    1 │ it(‘should do bar’, () => {});
  > 2 │ it(‘should do bar’, () => {});
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    3 │ 
  
  ℹ A test with this title already exists in the same scope.
  
  ℹ Rename the test to give it a unique, descriptive title.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

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describe('foo', () => {
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  it('should do bar', () => {});
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  it('should do bar', () => {});
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});

code-block.js:3:3 lint/nursery/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Duplicate test title found.
  
    1 │ describe(‘foo’, () => {
    2 │   it(‘should do bar’, () => {});
  > 3 │   it(‘should do bar’, () => {});
      │   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    4 │ });
    5 │ 
  
  ℹ A test with this title already exists in the same scope.
  
  ℹ Rename the test to give it a unique, descriptive title.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

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describe('foo', () => {});
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describe('foo', () => {});

code-block.js:2:1 lint/nursery/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Duplicate describe title found.
  
    1 │ describe(‘foo’, () => {});
  > 2 │ describe(‘foo’, () => {});
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^
    3 │ 
  
  ℹ A describe with this title already exists in the same scope.
  
  ℹ Rename the describe to give it a unique, descriptive title.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

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describe('foo', () => {
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  describe('baz', () => {});
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  describe('baz', () => {});
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});

code-block.js:3:3 lint/nursery/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Duplicate describe title found.
  
    1 │ describe(‘foo’, () => {
    2 │   describe(‘baz’, () => {});
  > 3 │   describe(‘baz’, () => {});
      │   ^^^^^^^^^^^^^^^^^^^^^^^^^
    4 │ });
    5 │ 
  
  ℹ A describe with this title already exists in the same scope.
  
  ℹ Rename the describe to give it a unique, descriptive title.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

Valid

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describe('foo', () => {
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  it('should do foo', () => {});
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  it('should do bar', () => {});
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});
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describe('bar', () => {});

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describe('foo', () => {
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  describe('baz', () => {
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    it('should work', () => {});
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  });
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  describe('bar', () => {
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    it('should work', () => {});
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  });
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});