public void TestEquals()
        {
            var a = new MongoCredentials("user1", "password");
            var b = new MongoCredentials("user1", "password");
            var c = new MongoCredentials("user2", "password");
            var n = (MongoCredentials)null;

            Assert.IsTrue(object.Equals(a, b));
            Assert.IsFalse(object.Equals(a, c));
            Assert.IsFalse(a.Equals(n));
            Assert.IsFalse(a.Equals(null));

            Assert.IsTrue(a == b);
            Assert.IsFalse(a == c);
            Assert.IsFalse(a == null);
            Assert.IsFalse(null == a);
            Assert.IsTrue(n == null);
            Assert.IsTrue(null == n);

            Assert.IsFalse(a != b);
            Assert.IsTrue(a != c);
            Assert.IsTrue(a != null);
            Assert.IsTrue(null != a);
            Assert.IsFalse(n != null);
            Assert.IsFalse(null != n);
        }