public void Encode_Map_With_Null_Value_Throws_ArgumentNullException()
{
var value = new Dictionary <string, string>
{
{ "k1", "value1" },
{ "k2", null }
};
var ex = Assert.Throws <ArgumentNullException>(() => TypeCodec.EncodeMap(2, MapColumnInfoStringString, value));
StringAssert.Contains("collections", ex.Message);
}