noIdenticalTestTitle (JavaScript)

Language JavaScript (and super languages)

Summary

Rule available since: v2.4.12
Diagnostic Category: lint/suspicious/noIdenticalTestTitle
This rule is recommended, meaning it is enabled by default.
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
- Same as playwright/no-identical-title

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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        "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:1:4 lint/suspicious/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ The test title "should do bar" is used more than once in the same scope.
  
  > 1 │ it('should do bar', () => {});
      │    ^^^^^^^^^^^^^^^
    2 │ it('should do bar', () => {});
    3 │ 
  
  ℹ The test title "should do bar" is repeated here.
  
    1 │ it('should do bar', () => {});
  > 2 │ it('should do bar', () => {});
      │    ^^^^^^^^^^^^^^^
    3 │ 
  
  ℹ Rename the duplicated test calls to give each a unique, descriptive title.

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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:2:6 lint/suspicious/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ The test title "should do bar" is used more than once in the same scope.
  
    1 │ describe('foo', () => {
  > 2 │   it('should do bar', () => {});
      │      ^^^^^^^^^^^^^^^
    3 │   it('should do bar', () => {});
    4 │ });
  
  ℹ The test title "should do bar" is repeated here.
  
    1 │ describe('foo', () => {
    2 │   it('should do bar', () => {});
  > 3 │   it('should do bar', () => {});
      │      ^^^^^^^^^^^^^^^
    4 │ });
    5 │ 
  
  ℹ Rename the duplicated test calls to give each a unique, descriptive title.

1
describe('foo', () => {});
2
describe('foo', () => {});

code-block.js:1:10 lint/suspicious/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ The describe title "foo" is used more than once in the same scope.
  
  > 1 │ describe('foo', () => {});
      │          ^^^^^
    2 │ describe('foo', () => {});
    3 │ 
  
  ℹ The describe title "foo" is repeated here.
  
    1 │ describe('foo', () => {});
  > 2 │ describe('foo', () => {});
      │          ^^^^^
    3 │ 
  
  ℹ Rename the duplicated describe calls to give each a unique, descriptive title.

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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:2:12 lint/suspicious/noIdenticalTestTitle ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ The describe title "baz" is used more than once in the same scope.
  
    1 │ describe('foo', () => {
  > 2 │   describe('baz', () => {});
      │            ^^^^^
    3 │   describe('baz', () => {});
    4 │ });
  
  ℹ The describe title "baz" is repeated here.
  
    1 │ describe('foo', () => {
    2 │   describe('baz', () => {});
  > 3 │   describe('baz', () => {});
      │            ^^^^^
    4 │ });
    5 │ 
  
  ℹ Rename the duplicated describe calls to give each a unique, descriptive title.

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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});