Build refinement transfers from union and pin physical body support

tests/unit/test_multiple_pinned_remap.py

@@ -81,14 +81,9 @@ class MultiplePinnedRemap(unittest.TestCase):
         self.assertEqual(old.pinned_rectangles, PINS)
         self.check_transfer(old, new, fields(old), 2e-13)
 
-    def test_direct_helper_rejects_each_changed_pin_and_body_order(self):
+    def test_direct_helper_rejects_changed_body_order(self):
         old = mesh(PINS+FLUID, objects())
         candidates = [mesh(PINS+FLUID, objects()[::-1])]
-        for index in range(2):
-            changed = list(PINS+FLUID)
-            x0, y0, x1, y1 = changed[index]
-            changed[index] = (x0-4, y0, x1, y1)
-            candidates.append(mesh(changed, objects()))
         for new in candidates:
             # Invalid donors ensure boundary validation precedes array reads.
             with self.assertRaisesRegex(ValueError, 'pinned'):
@@ -138,6 +133,7 @@ class MultiplePinnedRemap(unittest.TestCase):
             changed = list(PINS+FLUID)
             x0, y0, x1, y1 = changed[index]
             changed[index] = (x0-4, y0, x1, y1)
+            changed[index] = (x0+8, y0, x1, y1)  # removes actual body support
             cases.append((changed, bodies))
             cases.append((tuple(r for i, r in enumerate(PINS+FLUID) if i != index), bodies))
         start = len(allocations)