public void AddOrUpdateTest2NullCheck()
        {
            // ReSharper disable once AssignNullToNotNullAttribute
            Action test = () => IDictionaryEx.AddOrUpdate(null, new Object(), () => new Object());

            Assert.Throws <ArgumentNullException>(test);
        }
        public void AddOrUpdateTest1NullCheck()
        {
            // ReSharper disable once AssignNullToNotNullAttribute
            Action test = () => IDictionaryEx.AddOrUpdate(null, new KeyValuePair <Object, Object>(new Object(), new Object()));

            test.ShouldThrow <ArgumentNullException>();
        }