Use the same method as Android for calculating Bluetooth UUIDs.

test/net/sf/briar/plugins/bluetooth/BluetoothClientTest.java

@@ -19,7 +19,7 @@ public class BluetoothClientTest extends DuplexClientTest {
 		// Store the server's Bluetooth address and UUID
 		TransportProperties p = new TransportProperties();
 		p.put("address", serverAddress);
-		p.put("uuid", BluetoothTest.UUID);
+		p.put("uuid", BluetoothTest.getUuid());
 		Map<ContactId, TransportProperties> remote =
 			Collections.singletonMap(contactId, p);
 		// Create the plugin

test/net/sf/briar/plugins/bluetooth/BluetoothServerTest.java

@@ -16,7 +16,7 @@ public class BluetoothServerTest extends DuplexServerTest {
 	private BluetoothServerTest(Executor executor) {
 		// Store the UUID
 		TransportProperties local = new TransportProperties();
-		local.put("uuid", BluetoothTest.UUID);
+		local.put("uuid", BluetoothTest.getUuid());
 		// Create the plugin
 		callback = new ServerCallback(new TransportConfig(), local,
 				Collections.singletonMap(contactId, new TransportProperties()));

test/net/sf/briar/plugins/bluetooth/BluetoothTest.java

 package net.sf.briar.plugins.bluetooth;
 
-interface BluetoothTest {
+import java.util.UUID;
 
-	static final String UUID = "CABBA6E5CABBA6E5CABBA6E5CABBA6E5";
+class BluetoothTest {
+
+	private static final String EMPTY_UUID =
+			UUID.nameUUIDFromBytes(new byte[0]).toString().replaceAll("-", "");
+
+	static String getUuid() {
+		return EMPTY_UUID;
+	}
 }
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