Add test for get_physical_group_bounding_box

Author: simlapointe

test/test_solidmodel.jl

@@ -999,7 +999,7 @@ import DeviceLayout.SolidModels.STP_UNIT
     sm = test_sm()
     render!(sm, cs) # runs without error
 
-    # Use get_boundary and set_periodic!
+    # Use get_boundary, get_physical_group_bounding_box, and set_periodic!
     cs = CoordinateSystem("test", nm)
     place!(cs, centered(Rectangle(500μm, 100μm)), :l1)
     postrender_ops = [("ext", SolidModels.extrude_z!, (:l1, 20μm))]
@@ -1021,6 +1021,13 @@ import DeviceLayout.SolidModels.STP_UNIT
             "set_periodic! only supports distinct parallel axis-aligned surfaces."
         ) SolidModels.set_periodic!(sm, "Xmin", "Ymax")
     )
+    @test all(
+        isapprox.(
+            SolidModels.get_physical_group_bounding_box(2, [3, 5]),
+            ustrip.(STP_UNIT, (-250μm, -50μm, 0μm, 250μm, 50μm, 20μm)),
+            atol=1e-6
+        )
+    )
     periodic_tags = SolidModels.set_periodic!(sm["Xmin", 2], sm["Xmax", 2])
     @test !isempty(periodic_tags)