Added a test script to control the test, using python.

tests/README

 The sketches in this directory are intended to be checkin tests.
 No code should be pushed to github without these tests passing.
+
+The way I run each test is from within the sketch dir, doing this:
+jam p4 p6 && ./runtest.py /dev/tty.usbserial-A40081RP
+
+runtest.py will exit with code 0 on pass code 1 on fail
+
+Note that this requires python and py-serial
+

tests/pingpair_test/pingpair_test.pde

@@ -239,9 +239,9 @@ void loop(void)
     detachInterrupt(0);
     printf("\n\r+OK ");
     if ( passed )
-      printf("PASS\n\r");
+      printf("PASS\n\r\n\r");
     else
-      printf("FAIL\n\r");
+      printf("FAIL\n\r\n\r");
 
     // Wait here
     while(1) {}

tests/pingpair_test/runtest.py

+#!/opt/local/bin/python
+
+import sys,serial
+
+def read_until(token):
+	while 1: 
+		line = ser.readline(None,"\r")
+		sys.stdout.write(line)
+
+		if (line.startswith("+OK")):
+			break
+	return line
+
+
+ser = serial.Serial(sys.argv[1], 57600, timeout=5)
+line = read_until("+OK")
+if (line.find("PASS") != -1):
+	sys.exit(0)
+else:
+	sys.exit(1)