Added jest way of mocking ESM modules in test cases

src/require-ts-extension-imports.spec.ts

@@ -7,6 +7,15 @@ type StatSyncFn = (path: PathLike) => Stats;
 
 jest.unstable_mockModule('fs', () => ({
   default: {
+    existsSync: jest.fn(
+      (path) =>
+        typeof path === 'string' &&
+        (path.endsWith('bar') ||
+          path.endsWith('src/bar') ||
+          path.endsWith('bar-dir') ||
+          path.endsWith('services') ||
+          path.endsWith('.test')),
+    ),
     statSync: jest.fn<StatSyncFn>().mockImplementation(((path) => ({
       isDirectory: () => typeof path === 'string' && (path.endsWith('bar-dir') || path.endsWith('services')),
     })) as StatSyncFn),
@@ -66,5 +75,11 @@ createTester().run(ruleId, rule, {
       output: `import type { ping } from '../../../services/index.ts';`,
       name: 'Invalid import typing from directory without .ts extension',
     },
+    {
+      code: `import { bar, foo, foo1 } from './test/bar.test';`,
+      errors: [{ messageId: 'REQUIRE-TS-EXTENSION-IMPORTS' }],
+      output: `import { bar, foo, foo1 } from './test/bar.test.ts';`,
+      name: 'Invalid import typing from test file without .ts extension',
+    },
   ],
 });

src/require-ts-extension-imports.ts

@@ -38,7 +38,12 @@ const rule: ReturnType<typeof createRule> = createRule({
     return {
       ImportDeclaration(node: TSESTree.ImportDeclaration) {
         const importPath = node.source.value;
-        if (importPath.startsWith('.') && !importPath.endsWith('.ts') && !importPath.endsWith('.json')) {
+        if (
+          importPath.startsWith('.') &&
+          !importPath.endsWith('.ts') &&
+          !importPath.endsWith('.json') &&
+          fs.existsSync(importPath)
+        ) {
           const absoluteImportPath = path.resolve(path.dirname(filename), importPath);
           const stats = fs.statSync(absoluteImportPath);
           const isDirectory = stats.isDirectory();