test: add extra tests for basename with ext option

PR-URL: #44772
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Rich Trott <[email protected]>

Author: connorjburton

test/parallel/test-path-basename.js

@@ -6,6 +6,10 @@ const path = require('path');
 assert.strictEqual(path.basename(__filename), 'test-path-basename.js');
 assert.strictEqual(path.basename(__filename, '.js'), 'test-path-basename');
 assert.strictEqual(path.basename('.js', '.js'), '');
+assert.strictEqual(path.basename('js', '.js'), 'js');
+assert.strictEqual(path.basename('file.js', '.ts'), 'file.js');
+assert.strictEqual(path.basename('file', '.js'), 'file');
+assert.strictEqual(path.basename('file.js.old', '.js.old'), 'file');
 assert.strictEqual(path.basename(''), '');
 assert.strictEqual(path.basename('/dir/basename.ext'), 'basename.ext');
 assert.strictEqual(path.basename('/basename.ext'), 'basename.ext');