feat: lazily init jfj client

tests/unit/devices/test_jfjoch.py

@@ -34,7 +34,10 @@ def mock_jfjoch_client():
 
 @pytest.fixture
 def jfjoch_wrapper(mock_jfjoch_client):
-    return JFJochWrapper(MXBeamline.X10SA)
+    wrapper = JFJochWrapper(MXBeamline.X10SA)
+    # the client/api are created lazily, connect up front so tests start from a live wrapper
+    wrapper.connect()
+    return wrapper
 
 
 def create_mock_daq_status():
@@ -107,6 +110,19 @@ def test_init_unknown():
         JFJochWrapper("UNKNOWN")
 
 
+def test_client_is_created_lazily(mock_jfjoch_client):
+    wrapper = JFJochWrapper(MXBeamline.X10SA)
+    assert wrapper._connected is False
+    mock_jfjoch_client.status_get.assert_not_called()
+
+    # a decorated method connects on demand, further calls reuse the same api
+    wrapper.is_idle()
+    assert wrapper._connected is True
+    api = wrapper._api
+    wrapper.is_idle()
+    assert wrapper._api is api
+
+
 def test_initialize(jfjoch_wrapper, mock_jfjoch_client):
     mock_jfjoch_client.initialize_post.reset_mock()
     jfjoch_wrapper.initialize()