Added a connection registry to avoid creating redundant connections.

test/net/sf/briar/BriarTestCase.java

@@ -0,0 +1,19 @@
+package net.sf.briar;
+
+import java.lang.Thread.UncaughtExceptionHandler;
+
+import junit.framework.TestCase;
+
+public abstract class BriarTestCase extends TestCase {
+
+	public BriarTestCase() {
+		super();
+		// Ensure exceptions thrown on worker threads cause tests to fail
+		UncaughtExceptionHandler fail = new UncaughtExceptionHandler() {
+			public void uncaughtException(Thread thread, Throwable throwable) {
+				fail();
+			}
+		};
+		Thread.setDefaultUncaughtExceptionHandler(fail);
+	}
+}