Add seventh H3 scene image slot

tests/test_dumas_image_nodes.py

@@ -348,12 +348,14 @@ class DumasImageNodeTests(unittest.TestCase):
         plan = {"shots": [{"id": "one"}, {"id": "two"}]}
         image_1 = FakeTensorBatch()
         image_2 = FakeTensorBatch(width=12, height=9)
+        image_3 = FakeTensorBatch(width=8, height=8)
 
         plan_after_first, _connected = attach_node.attach(plan=plan, scene_index=1, image2=image_1)
         plan_after_second, _connected = attach_node.attach(
             plan=plan_after_first,
             scene_index=2,
             image6=image_2,
+            image7=image_3,
         )
 
         scene1 = extract_node.extract(plan_after_second, 1)
@@ -362,10 +364,11 @@ class DumasImageNodeTests(unittest.TestCase):
         self.assertIs(scene1[2], image_1)
         self.assertEqual(scene1[-1], 1)
         self.assertIs(scene2[6], image_2)
-        self.assertEqual(scene2[-1], 1)
+        self.assertIs(scene2[7], image_3)
+        self.assertEqual(scene2[-1], 2)
         self.assertEqual(
             plan_after_second["_dumas_scene_image_bindings"]["scene_counts"],
-            {"1": 1, "2": 1},
+            {"1": 1, "2": 2},
         )
 
     def test_h3_plan_scene_images_metadata_is_json_serializable(self):