fixup: add getter test

Author: guybedford

test/parallel/test-global-setters.js

@@ -11,6 +11,9 @@ assert.strictEqual(process, 'asdf');
 assert.strictEqual(global.process, 'asdf');
 global.process = _process;
 assert.strictEqual(process, _process);
+assert.strictEqual(
+  typeof Object.getOwnPropertyDescriptor(global, 'process').get,
+  'function');
 
 assert.strictEqual(Buffer, _Buffer);
 // eslint-disable-next-line no-global-assign
@@ -19,3 +22,6 @@ assert.strictEqual(Buffer, 'asdf');
 assert.strictEqual(global.Buffer, 'asdf');
 global.Buffer = _Buffer;
 assert.strictEqual(Buffer, _Buffer);
+assert.strictEqual(
+  typeof Object.getOwnPropertyDescriptor(global, 'Buffer').get,
+  'function');