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BREAKING CHANGE: prefer-to-be-undefined rule has been removed and merged into this rule.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| # Suggest using `toBeDefined()` / `toBeUndefined()` (prefer-to-be-defined) | ||
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| In order to have a better failure message, `toBeDefined()` or `toBeUndefined()` | ||
| should be used upon asserting expections on defined or undefined value. | ||
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| ## Rule details | ||
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| This rule triggers a warning if `not.toBe()` is used to assert a undefined value | ||
| or `toBe()` is used to assert a undefined value. | ||
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| ```js | ||
| expect(true).not.toBe(undefined); | ||
| expect(undefined).toBe(undefined); | ||
| ``` | ||
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| This rule is enabled by default. | ||
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| ### Default configuration | ||
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| The following patterns are considered warning: | ||
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| ```js | ||
| expect(true).not.toBeUndefined(); | ||
| expect(undefined).toBe(undefined); | ||
| ``` | ||
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| The following patterns are not warning: | ||
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| ```js | ||
| expect(true).toBeDefined(); | ||
| expect(undefined).toBeUndefined(); | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| 'use strict'; | ||
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| const RuleTester = require('eslint').RuleTester; | ||
| const rules = require('../../').rules; | ||
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| const ruleTester = new RuleTester(); | ||
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| ruleTester.run('prefer_to_be_defined', rules['prefer-to-be-defined'], { | ||
| valid: [ | ||
| 'expect(true).toBeDefined();', | ||
| 'expect(true).not.toBeDefined();', | ||
| 'expect(true).toBe(true);', | ||
| 'expect(undefined).toBeUndefined();', | ||
| 'expect({}).toEqual({});', | ||
| 'expect(null).toEqual(null);', | ||
| ], | ||
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| invalid: [ | ||
| { | ||
| code: 'expect(true).not.toBe(undefined);', | ||
| errors: [ | ||
| { | ||
| message: 'Use toBeDefined() instead', | ||
| column: 14, | ||
| line: 1, | ||
| }, | ||
| ], | ||
| output: 'expect(true).toBeDefined();', | ||
| }, | ||
| { | ||
| code: 'expect(true).not.toEqual(undefined);', | ||
| errors: [ | ||
| { | ||
| message: 'Use toBeDefined() instead', | ||
| column: 14, | ||
| line: 1, | ||
| }, | ||
| ], | ||
| output: 'expect(true).toBeDefined();', | ||
| }, | ||
| { | ||
| code: 'expect(true).not.toBeUndefined();', | ||
| errors: [ | ||
| { | ||
| message: 'Use toBeDefined() instead', | ||
| column: 14, | ||
| line: 1, | ||
| }, | ||
| ], | ||
| output: 'expect(true).toBeDefined();', | ||
| }, | ||
| { | ||
| code: 'expect(undefined).toBe(undefined);', | ||
| errors: [ | ||
| { | ||
| message: 'Use toBeUndefined() instead', | ||
| column: 19, | ||
| line: 1, | ||
| }, | ||
| ], | ||
| output: 'expect(undefined).toBeUndefined();', | ||
| }, | ||
| { | ||
| code: 'expect(undefined).toEqual(undefined);', | ||
| errors: [ | ||
| { | ||
| message: 'Use toBeUndefined() instead', | ||
| column: 19, | ||
| line: 1, | ||
| }, | ||
| ], | ||
| output: 'expect(undefined).toBeUndefined();', | ||
| }, | ||
| ], | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| 'use strict'; | ||
| const argument = require('./util').argument; | ||
| const argument2 = require('./util').argument2; | ||
| const expectNotToBeCase = require('./util').expectNotToBeCase; | ||
| const expectNotToBeUndefinedCase = require('./util').expectNotToBeUndefinedCase; | ||
| const expectNotToEqualCase = require('./util').expectNotToEqualCase; | ||
| const expectToBeCase = require('./util').expectToBeCase; | ||
| const expectToEqualCase = require('./util').expectToEqualCase; | ||
| const method = require('./util').method; | ||
| const method2 = require('./util').method2; | ||
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| module.exports = context => { | ||
| return { | ||
| CallExpression(node) { | ||
| if ( | ||
| expectNotToBeCase(node, undefined) || | ||
| expectNotToEqualCase(node, undefined) || | ||
| expectNotToBeUndefinedCase(node) | ||
| ) { | ||
| context.report({ | ||
| fix(fixer) { | ||
| const propertyDot = context | ||
| .getSourceCode() | ||
| .getFirstTokenBetween( | ||
| method(node), | ||
| method2(node), | ||
| token => token.value === '.' | ||
| ); | ||
| const fixes = [ | ||
| fixer.remove(method(node)), | ||
| fixer.remove(propertyDot), | ||
| fixer.replaceText(method2(node), 'toBeDefined'), | ||
| ]; | ||
| if (argument2(node)) { | ||
| fixes.push(fixer.remove(argument2(node))); | ||
| } | ||
| return fixes; | ||
| }, | ||
| message: 'Use toBeDefined() instead', | ||
| node: method(node), | ||
| }); | ||
| } else if ( | ||
| expectToBeCase(node, undefined) || | ||
| expectToEqualCase(node, undefined) | ||
| ) { | ||
| context.report({ | ||
| fix(fixer) { | ||
| return [ | ||
| fixer.replaceText(method(node), 'toBeUndefined'), | ||
| fixer.remove(argument(node)), | ||
| ]; | ||
| }, | ||
| message: 'Use toBeUndefined() instead', | ||
| node: method(node), | ||
| }); | ||
| } | ||
| }, | ||
| }; | ||
| }; |
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