fix(test): add a temporary test

tests/test_problem.py

@@ -0,0 +1,26 @@
+import pytest
+
+from bec_widgets.cli.client import BECFigure
+from bec_widgets.cli.server import BECWidgetsCLIServer
+from bec_widgets.utils.bec_dispatcher import _BECDispatcher
+
+
+@pytest.fixture
+def rpc_server(qtbot):
+    # make a new dispatcher (not using the singleton), since the server is supposed to run in another process
+    dispatcher = _BECDispatcher()
+    server = BECWidgetsCLIServer(gui_id="id_test", dispatcher=dispatcher)
+    qtbot.addWidget(server.fig)
+    qtbot.waitExposed(server.fig)
+    qtbot.wait(200)
+    yield server
+    server.client.shutdown()
+
+
+def test_rpc_waveform1d(rpc_server, qtbot):
+    fig = BECFigure(rpc_server.gui_id)
+    ax = fig.add_plot()
+    curve = ax.add_curve_custom([1, 2, 3], [1, 2, 3])
+    curve.set_color("red")
+    curve = ax.curves[0]
+    curve.set_color("blue")