public virtual void testRemoveKeys()
{
JDFAttributeMap m1 = new JDFAttributeMap("a1", "v1");
m1.put("a2", "v2");
JDFAttributeMap m2 = new JDFAttributeMap("a1", "v1");
SupportClass.HashSetSupport <string> keys = new SupportClass.HashSetSupport <string>();
keys.Add("a2");
m1.removeKeys(keys);
Assert.AreEqual(m1, m2);
m1.put("a2", null);
Assert.AreNotEqual(m1, m2);
m1.removeKeys(keys);
Assert.AreEqual(m1, m2);
}