add some comments to the tests..

RainEagle/parse.py

@@ -249,6 +249,8 @@ m	1572793208.3	1572764405	Connected	0	0	kW	0	0	kWh
 		s = StringIO(self.zonelines)
 		pos = 10
 		s.seek(pos)
+
+		# generate an index
 		genidx = ParseLog.generateIndex(s, 2)
 
 		zpos = [ i for i, x in enumerate(self.zonelines) if x == 'z' ]
@@ -256,19 +258,25 @@ m	1572793208.3	1572764405	Connected	0	0	kW	0	0	kWh
 		# that the position remained the same
 		self.assertEqual(s.tell(), pos)
 
+		# make sure the index has the correct information
 		self.assertEqual(genidx['length'], len(s.getvalue()))
 		self.assertEqual(genidx['index'], [ (1572767995, zpos[0]), (1572778900, zpos[1]) ])
 
+		# and that verify index works
 		self.assertTrue(ParseLog.verifyIndex(genidx, s))
 
 		s.seek(pos)
 
 		tmp = genidx.copy()
 		tmp['length'] = 0
+
+		# that is fails when the length is wrong
 		self.assertFalse(ParseLog.verifyIndex(tmp, s))
 
 		tmp = genidx.copy()
 		tmp['index'][0] = (tmp['index'][0][0], 10)
+
+		# that it fails when the position is wrong
 		self.assertFalse(ParseLog.verifyIndex(tmp, s))
 
 		# that the position remained the same