Added init tests

Author: Vandy Liu

src/microbit/test/test_init.py

@@ -0,0 +1,27 @@
+import time
+
+import pytest
+from unittest import mock
+
+from .. import *
+from ..__model.microbit_model import MicrobitModel
+
+# tests methods in __init__.py
+
+
+class TestShim(object):
+    def test_sleep(self):
+        milliseconds = 100
+        MicrobitModel.sleep = mock.Mock()
+        sleep(milliseconds)
+        MicrobitModel.sleep.assert_called_with(milliseconds)
+
+    def test_running_time(self):
+        MicrobitModel.running_time = mock.Mock()
+        running_time()
+        MicrobitModel.running_time.assert_called_once()
+
+    def test_temperature(self):
+        MicrobitModel.temperature = mock.Mock()
+        temperature()
+        MicrobitModel.temperature.asser_called_once()