1 files changed, 106 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-path-extname.js b/tests/node_compat/test/parallel/test-path-extname.js
new file mode 100644
index 000000000..d1ed0342b
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-path-extname.js
@@ -0,0 +1,106 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+require('../common');
+const assert = require('assert');
+const path = require('path');
+
+const failures = [];
+const slashRE = /\//g;
+
+[
+  [__filename, '.js'],
+  ['', ''],
+  ['/path/to/file', ''],
+  ['/path/to/file.ext', '.ext'],
+  ['/path.to/file.ext', '.ext'],
+  ['/path.to/file', ''],
+  ['/path.to/.file', ''],
+  ['/path.to/.file.ext', '.ext'],
+  ['/path/to/f.ext', '.ext'],
+  ['/path/to/..ext', '.ext'],
+  ['/path/to/..', ''],
+  ['file', ''],
+  ['file.ext', '.ext'],
+  ['.file', ''],
+  ['.file.ext', '.ext'],
+  ['/file', ''],
+  ['/file.ext', '.ext'],
+  ['/.file', ''],
+  ['/.file.ext', '.ext'],
+  ['.path/file.ext', '.ext'],
+  ['file.ext.ext', '.ext'],
+  ['file.', '.'],
+  ['.', ''],
+  ['./', ''],
+  ['.file.ext', '.ext'],
+  ['.file', ''],
+  ['.file.', '.'],
+  ['.file..', '.'],
+  ['..', ''],
+  ['../', ''],
+  ['..file.ext', '.ext'],
+  ['..file', '.file'],
+  ['..file.', '.'],
+  ['..file..', '.'],
+  ['...', '.'],
+  ['...ext', '.ext'],
+  ['....', '.'],
+  ['file.ext/', '.ext'],
+  ['file.ext//', '.ext'],
+  ['file/', ''],
+  ['file//', ''],
+  ['file./', '.'],
+  ['file.//', '.'],
+].forEach((test) => {
+  const expected = test[1];
+  [path.posix.extname, path.win32.extname].forEach((extname) => {
+    let input = test[0];
+    let os;
+    if (extname === path.win32.extname) {
+      input = input.replace(slashRE, '\\');
+      os = 'win32';
+    } else {
+      os = 'posix';
+    }
+    const actual = extname(input);
+    const message = `path.${os}.extname(${JSON.stringify(input)})\n  expect=${
+      JSON.stringify(expected)}\n  actual=${JSON.stringify(actual)}`;
+    if (actual !== expected)
+      failures.push(`\n${message}`);
+  });
+  {
+    const input = `C:${test[0].replace(slashRE, '\\')}`;
+    const actual = path.win32.extname(input);
+    const message = `path.win32.extname(${JSON.stringify(input)})\n  expect=${
+      JSON.stringify(expected)}\n  actual=${JSON.stringify(actual)}`;
+    if (actual !== expected)
+      failures.push(`\n${message}`);
+  }
+});
+assert.strictEqual(failures.length, 0, failures.join(''));
+
+// On Windows, backslash is a path separator.
+assert.strictEqual(path.win32.extname('.\\'), '');
+assert.strictEqual(path.win32.extname('..\\'), '');
+assert.strictEqual(path.win32.extname('file.ext\\'), '.ext');
+assert.strictEqual(path.win32.extname('file.ext\\\\'), '.ext');
+assert.strictEqual(path.win32.extname('file\\'), '');
+assert.strictEqual(path.win32.extname('file\\\\'), '');
+assert.strictEqual(path.win32.extname('file.\\'), '.');
+assert.strictEqual(path.win32.extname('file.\\\\'), '.');
+
+// On *nix, backslash is a valid name component like any other character.
+assert.strictEqual(path.posix.extname('.\\'), '');
+assert.strictEqual(path.posix.extname('..\\'), '.\\');
+assert.strictEqual(path.posix.extname('file.ext\\'), '.ext\\');
+assert.strictEqual(path.posix.extname('file.ext\\\\'), '.ext\\\\');
+assert.strictEqual(path.posix.extname('file\\'), '');
+assert.strictEqual(path.posix.extname('file\\\\'), '');
+assert.strictEqual(path.posix.extname('file.\\'), '.\\');
+assert.strictEqual(path.posix.extname('file.\\\\'), '.\\\\');