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/** * Tests for the no-throw-statements ESLint rule */ const { RuleTester } = require('eslint'); const noThrowStatementsRule = require('../no-throw-statements'); // Use ESLint v9+ flat config format const ruleTester = new RuleTester({ languageOptions: { ecmaVersion: 2020, sourceType: 'module', } }); ruleTester.run('no-throw-statements', noThrowStatementsRule, { valid: [ // Using Try pattern instead of throw "import { Failure } from '../utils/try'; function example() { return Failure(new Error('error')); }", // Regular function with no throws "function example() { return true; }", // Try/catch with no throws "try { console.log('test'); } catch (e) { console.error(e); }", // Using Try pattern in a conditional "import { Failure } from '../utils/try'; function example(condition) { if (condition) { return Failure(new Error('error')); } }", // Allowed via options.allowInCatchBlocks { code: "try { console.log('test'); } catch (e) { throw e; }", options: [{ allowInCatchBlocks: true }] }, // Allowed via options.allowList { code: "function example() { throw new Error('Not allowed'); }", options: [{ allowList: ['no-throw-statements.test.js'] }], filename: 'no-throw-statements.test.js' } ], invalid: [ // Basic throw case { code: "function example() { throw new Error('Not allowed'); }", errors: [{ messageId: 'noThrow', suggestions: [ { messageId: 'suggestTryPattern', output: "function example() { return Failure(new Error('Not allowed')); }" } ] }] }, // Throw in a conditional { code: "function example(condition) { if (condition) { throw new Error('Not allowed'); } }", errors: [{ messageId: 'noThrow', suggestions: [ { messageId: 'suggestTryPattern', output: "function example(condition) { if (condition) { return Failure(new Error('Not allowed')); } }" } ] }] }, // Throw in try/catch when not allowed in catch blocks { code: "try { console.log('test'); } catch (e) { throw e; }", errors: [{ messageId: 'noThrow', suggestions: [ { messageId: 'suggestTryPattern', output: "try { console.log('test'); } catch (e) { const error = Failure(e); /* Handle this error appropriately */ }" } ] }] }, // Throw with a complex expression { code: "function example() { throw new CustomError('Not allowed', 500); }", errors: [{ messageId: 'noThrow', suggestions: [ { messageId: 'suggestTryPattern', output: "function example() { return Failure(new CustomError('Not allowed', 500)); }" } ] }] }, // Throw with a variable { code: "function example() { const err = new Error('Not allowed'); throw err; }", errors: [{ messageId: 'noThrow', suggestions: [ { messageId: 'suggestTryPattern', output: "function example() { const err = new Error('Not allowed'); return Failure(err); }" } ] }] } ] });