unit tests for execution in desktop dev environment

tests/mocks.py

@@ -0,0 +1,20 @@
+import sys
+import time
+from unittest.mock import Mock
+
+
+def init_circuit_python_modules_mocks():
+    sys.modules['usb_hid'] = Mock()
+    sys.modules['digitalio'] = Mock()
+    sys.modules['neopixel'] = Mock()
+    sys.modules['pulseio'] = Mock()
+    sys.modules['busio'] = Mock()
+    sys.modules['microcontroller'] = Mock()
+    sys.modules['board'] = Mock()
+    sys.modules['storage'] = Mock()
+
+    sys.modules['micropython'] = Mock()
+    sys.modules['micropython'].const = lambda x: x
+
+    sys.modules['supervisor'] = Mock()
+    sys.modules['supervisor'].ticks_ms = lambda: time.time_ns() // 1_000_000