Add tests for using keyword support

test/path.ts

@@ -0,0 +1,32 @@
+import Path from '../lib/path.js';
+import t from 'tap';
+
+t.test('Path', async t => {
+  t.test('using keyword for temporary files', async t => {
+    let check = Path.currentFile();
+
+    t.test('dispose', t => {
+      {
+        using dir = Path.tempDirSync();
+        check = new Path(dir.toString());
+        const file = dir.child('foo.txt');
+        t.equal(file.writeFileSync('works').readFileSync('utf-8'), 'works');
+        t.same(check.existsSync(), true);
+      }
+      t.same(check.existsSync(), false);
+      t.end();
+    });
+
+    await t.test('asyncDispose', async t => {
+      let check = Path.currentFile();
+      {
+        await using dir = await Path.tempDir();
+        check = new Path(dir.toString());
+        const file = dir.child('foo.txt');
+        t.equal(file.writeFileSync('works too').readFileSync('utf-8'), 'works too');
+        t.same(await check.exists(), true);
+      }
+      t.same(await check.exists(), false);
+    });
+  });
+});