fix st

tests/test_processing.py

@@ -18,6 +18,7 @@ from rfg_adc_plotter.gui.pyqtgraph_backend import (
     resolve_initial_window_size,
     sanitize_curve_data_for_display,
     sanitize_image_for_display,
+    set_image_rect_if_ready,
     resolve_visible_fft_curves,
     resolve_visible_aux_curves,
 )
@@ -290,6 +291,26 @@ class ProcessingTests(unittest.TestCase):
 
         self.assertIsNone(data)
 
+    def test_set_image_rect_if_ready_skips_uninitialized_image(self):
+        class _DummyImageItem:
+            def __init__(self):
+                self.calls = 0
+
+            def width(self):
+                return None
+
+            def height(self):
+                return None
+
+            def setRect(self, *_args):
+                self.calls += 1
+
+        image_item = _DummyImageItem()
+        applied = set_image_rect_if_ready(image_item, 0.0, 0.0, 10.0, 1.0)
+
+        self.assertFalse(applied)
+        self.assertEqual(image_item.calls, 0)
+
     def test_resolve_axis_bounds_rejects_nonfinite_ranges(self):
         bounds = resolve_axis_bounds(np.asarray([np.nan, np.inf], dtype=np.float64))