diff --git a/tests/src/java/com/threerings/util/UIDTest.java b/tests/src/java/com/threerings/util/UIDTest.java
new file mode 100644
index 000000000..cabc45b63
--- /dev/null
+++ b/tests/src/java/com/threerings/util/UIDTest.java
@@ -0,0 +1,30 @@
+//
+// $Id$
+
+package com.threerings.util;
+
+import com.threerings.util.unsafe.Unsafe;
+
+/**
+ * Does something extraordinary.
+ */
+public class UIDTest
+{
+    public static void main (String[] args)
+    {
+        if (Unsafe.setuid(1000)) {
+            System.err.println("Yay! My uid is changed.");
+        } else {
+            System.err.println("Boo hoo! I couldn't change my uid.");
+        }
+        if (Unsafe.setgid(60)) {
+            System.err.println("Yay! My gid is changed.");
+        } else {
+            System.err.println("Boo hoo! I couldn't change my gid.");
+        }
+        try {
+            Thread.sleep(60*1000L);
+        } catch (Exception e) {
+        }
+    }
+}