unit test to ensure grouping doesnt break

src/test/java/eu/mihosoft/vrl/v3d/GroupingTest.java

@@ -0,0 +1,32 @@
+package eu.mihosoft.vrl.v3d;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class GroupingTest {
+
+	@Test
+	public void test() {
+		CSG c = new Cube(100).toCSG();
+		String groupID = "testing";
+		c.addGroupMembership(groupID);
+		c.setName("MyName");
+		c.addIsGroupResult(groupID);
+		CSG copy = c.clone().syncProperties(c).setName(c.getName());
+		copy.removeGroupMembership(groupID);
+		copy.removeIsGroupResult(groupID);
+
+		if(copy.isInGroup())
+			fail("Copy should not be in a group");
+		if(!c.isInGroup())
+			fail("Original should  be in a group");
+
+		if(copy.isGroupResult())
+			fail("Copy should not be in a group");
+		if(!c.isGroupResult())
+			fail("Original should  be in a group");
+
+	}
+
+}