Test: adds support for testing i2c reads

tests/test_sgp.py

@@ -2,10 +2,19 @@ from .context import sgp30
 
 from mock_smbus2 import MockSMBus
 import unittest
-class BasicTestSuite(unittest.TestCase):
+
+class TestConstructor(unittest.TestCase):
     """Basic test cases."""
     def setUp(self):
         self.bus = MockSMBus()
     def test_init(self):
         b=sgp30.sgp30.Sgp30(self.bus)
         b.init_sgp()
+
+class SimpleTest(unittest.TestCase):
+    """Basic test cases."""
+    def setUp(self):
+        self.bus = MockSMBus()
+        self.sgp=sgp30.sgp30.Sgp30(self.bus)
+    def test_read(self):
+        self.sgp.read_measurements()