TEST: Add basic tests that classes import correctly

tests/test_coder/test_millikey.py

@@ -0,0 +1,15 @@
+def test_import():
+    """
+    Test that classes can import without error
+    """
+    from psychopy_labhackers.millikey import MillikeyHIDButtonGroup, MillikeySerialButtonGroup
+
+def test_entry_points():
+    """
+    Test that classes are available from the correct locations after registering entry points
+    """
+    # activate plugins
+    from psychopy.plugins import activatePlugins
+    activatePlugins()
+    # import from entry points
+    from psychopy.hardware import MillikeyHIDButtonGroup, MillikeySerialButtonGroup