fix: could not use only function to filter test cases

index.js

@@ -4,6 +4,7 @@
 
 const fs = require('fs')
 const path = require('path')
+const test = require('./test')
 
 const rulePath = findRulePath(__dirname)
 if (!rulePath) {
@@ -23,7 +24,6 @@ if (process.argv.includes('test')) {
 		throw new Error('Could not find any rules.')
 	}
 
-	const test = require('./test')
 	if (test(module.exports.rules) === false) {
 		process.exit(1)
 	}

test.js

@@ -10,6 +10,17 @@ const chalk = require('chalk')
  * }} TestCases
  */
 
+const Exclusiveness = Symbol('exclusivenessToken')
+
+global.only = function only(testCase) {
+	// Disallow test case exclusiveness in CI
+	if (!process.env.CI) {
+		testCase[Exclusiveness] = true
+	}
+
+	return testCase
+}
+
 /**
  * @param {Record<string, import('eslint').Rule.RuleModule & { tests?: TestCases }>} rules
  * @returns {void | false}
@@ -18,20 +29,17 @@ module.exports = function test(rules) {
 	// See https://eslint.org/docs/latest/integrate/nodejs-api#ruletester
 	const tester = new RuleTester()
 
-	const exclusiveTestCases = []
-	global.only = function only(testCase) {
-		exclusiveTestCases.push(testCase)
-		return testCase
-	}
-
 	for (const ruleName in rules) {
 		const ruleModule = rules[ruleName]
 		if (!ruleModule.tests || typeof ruleModule.tests !== 'object') {
 			console.log('⚪ ' + ruleName)
 			continue
 		}
 
-		let skipped = false
+		const oneOrMoreTestCaseIsSkipped = !!(
+			ruleModule.tests.valid.some(testCase => testCase[Exclusiveness]) ||
+			ruleModule.tests.invalid.some(testCase => testCase[Exclusiveness])
+		)
 
 		const validItems = ruleModule.tests.valid.map(testCase => (
 			{ testCase, valid: [testCase], invalid: [] }
@@ -41,8 +49,7 @@ module.exports = function test(rules) {
 		))
 
 		for (const { testCase, valid, invalid } of [...validItems, ...invalidItems]) {
-			if (exclusiveTestCases.length > 0 && !exclusiveTestCases.includes(testCase)) {
-				skipped = true
+			if (oneOrMoreTestCaseIsSkipped && !testCase[Exclusiveness]) {
 				continue
 			}
 
@@ -65,7 +72,7 @@ module.exports = function test(rules) {
 			}
 		}
 
-		console.log((skipped ? '🟡' : '✅') + ' ' + ruleName)
+		console.log((oneOrMoreTestCaseIsSkipped ? '🟡' : '✅') + ' ' + ruleName)
 	}
 
 	console.log('')

test.test.js

@@ -72,3 +72,29 @@ it('returns false, given a failing test case', () => {
 	expect(console.log).toHaveBeenCalledWith('🔴 foo')
 	expect(console.error).toHaveBeenCalledWith(expect.stringMatching(/Should have no errors but had 1/))
 })
+
+it('runs only the test case wrapped with `only` function', () => {
+	const rules = {
+		foo: {
+			create(context) {
+				return {
+					Program(node) {
+						if (node.body.length > 0) {
+							context.report({
+								node,
+								message: 'bar'
+							})
+						}
+					}
+				}
+			},
+			tests: {
+				valid: [only({ code: '' }), { code: 'void(0)' }],
+				invalid: [],
+			}
+		}
+	}
+
+	expect(test(rules)).not.toBe(false)
+	expect(console.error).not.toHaveBeenCalled()
+})