fix graph and white background added

python_app/tests/test_sar3d_plot.py

@@ -234,7 +234,9 @@ class Sar3dIntegrationTest(unittest.TestCase):
                                  (_collection(_status(2, "fewer than two frequency points")), "error"),
                                  (_collection(_status(1, "No signal in selected depth range")), "no signal"),
                                  (_projections(), "ready — CUDA")):
-            self.view._pipeline.drain_results = mock.Mock(return_value=result)
+            # Like the real drain, the recomputed result replaces its sweep in history.
+            self.view._pipeline.drain_results = mock.Mock(
+                side_effect=lambda result=result, **_timing: self.view._history.record_result(result))
             self.view._live.changed()
             self.assertIn(expected, self.renderer.status_label.text())
         self.view._log.show_exception.assert_not_called()