diff --git a/tests/test_cadquery.py b/tests/test_cadquery.py
index 6ac1f8a0..9fabb7a1 100644
--- a/tests/test_cadquery.py
+++ b/tests/test_cadquery.py
@@ -1226,6 +1226,9 @@ class TestCadQuery(BaseTest):
         resS = currentS.cut(toCut.val())
 
         self.assertEqual(10, resS.faces().size())
+        
+        with self.assertRaises(ValueError):
+            currentS.cut(toCut.faces().val())
 
     def testIntersect(self):
         """
@@ -1244,6 +1247,15 @@ class TestCadQuery(BaseTest):
 
         self.assertEqual(6, resS.faces().size())
         self.assertAlmostEqual(resS.val().Volume(), 0.5)
+        
+        b1 = Workplane('XY').box(1,1,1)
+        b2 = Workplane('XY',origin=(0,0,0.5)).box(1,1,1)
+        resS = b1.intersect(b2)
+        
+        self.assertAlmostEqual(resS.val().Volume(), 0.5)
+        
+        with self.assertRaises(ValueError):
+            b1.intersect(b2.faces().val())
 
     def testBoundingBox(self):
         """
@@ -2036,6 +2048,9 @@ class TestCadQuery(BaseTest):
         resS = currentS.union(toUnion)
 
         self.assertEqual(11, resS.faces().size())
+        
+        with self.assertRaises(ValueError):
+            resS.union(toUnion.faces().val())
 
     def testCombine(self):
         s = Workplane(Plane.XY())
@@ -3358,3 +3373,17 @@ class TestCadQuery(BaseTest):
 
         bb = obj.BoundingBox()
         self.assertAlmostEqual(bb.zlen, h, 1)
+
+    def testUnionCompound(self):
+
+        box1 = Workplane('XY').box(10, 20, 30)
+        box2 = Workplane('YZ').box(10, 20, 30)
+        shape_to_cut = Workplane('XY').box(15, 15, 15).translate((8,8,8))
+        
+        list_of_shapes = []
+        for o in box1.all(): list_of_shapes.extend(o.vals())
+        for o in box2.all(): list_of_shapes.extend(o.vals())
+        
+        obj = Workplane('XY').newObject(list_of_shapes).cut(shape_to_cut)
+        
+        assert(obj.val().isValid())