Tests graphical output for testing

measure.py

@@ -53,6 +53,7 @@ class OhmPiHardware:
 
     def _clear_values(self):
         self.readings = np.array([])
+        self._start_time = None
 
     def _inject(self, duration):
             self.tx_sync.set()

test_measure_with_ohmpi_card_3_15.py

@@ -22,6 +22,8 @@ print(r)
 print(f'length of array: {len(r)}, expected length: {6000./k.rx.sampling_rate}')
 print(k.readings)
 fig, ax = plt.subplots()
-ax.plot(k.readings[:,0], k.readings[:,1], '-r')
-ax.plot(k.readings[:,0], k.readings[:,2], '-b')
+ax.plot(k.readings[:,0], k.readings[:,1], '-r', label='iab')
+ax2 = ax.twinx()
+ax2.plot(k.readings[:,0], k.readings[:,2], '-b', label='vmn')
+plt.show()
 change_config('config_default.py', verbose=False)