Add failing unit test for sangaboard version before v1

tests/test_sangaboard.py

@@ -0,0 +1,20 @@
+"""Tests for the Sangaboard thing."""
+
+import pytest
+
+from openflexure_microscope_server.things.stage.sangaboard import SangaboardThing
+
+
+@pytest.fixture
+def mock_sanga_thing(mocker):
+    """Return a Sangaboard thing with a MagicMock for self._sangaboard."""
+    sanga_thing = SangaboardThing()
+    sanga_thing._sangaboard = mocker.MagicMock()
+    return sanga_thing
+
+
+def test_check_old_firmware(mock_sanga_thing):
+    """Check firmware prior to version 1 throws a Runtime Error."""
+    mock_sanga_thing._sangaboard.firmware_version.return_value = "0.1.1"
+    with pytest.raises(RuntimeError):
+        mock_sanga_thing.check_firmware()