test: add get_scales coverage test for Fabric path

Exercises the Fabric-native get_scales() path.
Coverage of fabric_frame_view.py: 76% → 83%.

Author: pv-nvidia

source/isaaclab_physx/test/sim/test_views_xform_prim_fabric.py

@@ -199,3 +199,19 @@ def test_prepare_for_reuse_detects_topology_change(device, view_factory):
     result = view._fabric_selection.PrepareForReuse()
     assert isinstance(result, bool), f"PrepareForReuse should return bool, got {type(result)}"
     assert not result, "PrepareForReuse should return False when no topology change"
+
+
+@pytest.mark.parametrize("device", ["cuda:0"])
+def test_get_scales_fabric_path(device, view_factory):
+    """Exercise the Fabric-native get_scales path."""
+    bundle = view_factory(num_envs=1, device=device)
+    view = bundle.view
+
+    # Trigger Fabric init
+    view.get_world_poses()
+
+    scales = view.get_scales()
+    scales_t = wp.to_torch(scales)
+    # Default scale should be (1, 1, 1)
+    expected = torch.tensor([[1.0, 1.0, 1.0]], dtype=torch.float32, device=device)
+    torch.testing.assert_close(scales_t, expected, atol=1e-4, rtol=0)