add api test

spitest.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python2.7
+
+import RPi.GPIO as GPIO
+import spidev
+import random
+
+spi = spidev.SpiDev()
+spi.open(0, 0)
+
+random.seed()
+
+dataout = []
+
+for i in range(32):
+	dataout.append(random.randint(0, 255))
+
+print "Transfering testdata", dataout
+datain = spi.xfer2(dataout)
+
+if dataout == datain:
+	print "Received data OK!"
+
+spi.close()