fix(no-identical-title): improved internal error handling

Author: veritem

src/rules/no-identical-title.ts

@@ -57,13 +57,13 @@ export default createEslintRule<Options, MESSAGE_ID>({
 				const title = getStringValue(argument)
 
 				if (vitestFnCall.type === 'test') {
-					if (currentStack.testTitles.includes(title)) {
+					if (currentStack?.testTitles.includes(title)) {
 						context.report({
 							node,
 							messageId: 'multipleTestTitle'
 						})
 					}
-					currentStack.testTitles.push(title)
+					currentStack?.testTitles.push(title)
 				}
 
 				if (vitestFnCall.type !== 'describe')

src/utils/validVitestFnCallChains.ts

@@ -1005,9 +1005,6 @@ export const ValidVitestFnCallChains = new Set([
 	'describe.runIf.sequential.each',
 	'describe.runIf.shuffle.each',
 	'describe.runIf.todo.each',
-
-	// Call chains that are not supported by Vitest, but were in the original list
-	// TODO(@veritem): Remove the use of these call chains in the test suite
 	'xtest',
 	'xtest.each',
 	'xit',

tests/no-identical-title.test.ts

@@ -2,21 +2,34 @@ import rule, { RULE_NAME } from '../src/rules/no-identical-title'
 import { ruleTester } from './ruleTester'
 
 ruleTester.run(RULE_NAME, rule, {
-	valid: ['it(); it();', 'test("two", () => {});'],
-	invalid: [
-		{
-			code: `describe('foo', () => {
+  valid: [
+    'it(); it();',
+    'test("two", () => {});',
+    `fdescribe('a describe', () => {
+		test('a test', () => {
+		  expect(true).toBe(true);
+		});
+	  });
+	  fdescribe('another describe', () => {
+		test('a test', () => {
+		  expect(true).toBe(true);
+		});
+	  });`
+  ],
+  invalid: [
+    {
+      code: `describe('foo', () => {
 						  it('works', () => {});
 						  it('works', () => {});
 						});`,
-			errors: [{ messageId: 'multipleTestTitle' }]
-		},
-		{
-			code: `xdescribe('foo', () => {
+      errors: [{ messageId: 'multipleTestTitle' }]
+    },
+    {
+      code: `xdescribe('foo', () => {
 						  it('works', () => {});
 						  it('works', () => {});
 					  });`,
-			errors: [{ messageId: 'multipleTestTitle' }]
-		}
-	]
+      errors: [{ messageId: 'multipleTestTitle' }]
+    }
+  ]
 })