added test

Author: jacobrkerstetter

tests/integration/test_design.py

@@ -3909,3 +3909,26 @@ def test_write_body_facets_on_save(
 
     missing = expected_files - namelist
     assert not missing
+
+def test_combine_merge(modeler: Modeler):
+    design = modeler.create_design("combine_merge")
+    box1 = design.extrude_sketch("box1", Sketch().box(Point2D([0, 0]), 1, 1), 1)
+    box2 = design.extrude_sketch("box2", Sketch().box(Point2D([0.5, 0.5]), 1, 1), 1)
+    assert len(design.bodies) == 2
+
+    # combine the two boxes and check body count and volume
+    box1.combine_merge([box2])
+    design._update_design_inplace()
+    assert len(design.bodies) == 1
+    assert box1.volume.m == pytest.approx(Quantity(1.75, UNITS.m**3).m, rel=1e-6, abs=1e-8)
+
+    # create a third box
+    box1 = design.bodies[0]
+    box3 = design.extrude_sketch("box3", Sketch().box(Point2D([-0.5, -0.5]), 1, 1), 1)
+    assert len(design.bodies) == 2
+
+    # combine the two boxes and check body count and volume
+    box1.combine_merge([box3])
+    design._update_design_inplace()
+    assert len(design.bodies) == 1
+    assert box1.volume.m == pytest.approx(Quantity(2.5, UNITS.m**3).m, rel=1e-6, abs=1e-8)