test: naive test of crc

tests/test_sgp.py

@@ -22,5 +22,20 @@ class SimpleReadTests(unittest.TestCase):
     def setUp(self):
         self.bus = MockSMBus()
         self.sgp=sgp30.sgp30.Sgp30(self.bus)
+
     def test_read(self):
         self.assertEqual(self.sgp.read_measurements().data,[400,6])
+
+    #No real need to do this super-carefully
+    #or i will just be testing my own test code
+    #just make sure that CRC test are used, maybe..
+    def test_crc_ok(self):
+        d=self.sgp.read_measurements()
+        self.assertEqual(d.crc_ok,True)
+
+    def test_crc_fail(self):
+        bus=MockSMBus(break_crc=True)
+        sgp=sgp30.sgp30.Sgp30(bus)
+        d=sgp.read_measurements()
+        self.assertEqual(d.data,[400,6])
+        self.assertEqual(d.crc_ok,False)