public void Write_DBNull_ShouldReturnNullValue()
        {
            var options   = new JsonSerializerOptions();
            var converter = new DBNullConverter();

            MemoryStream memoryStream;

            using (memoryStream = new MemoryStream())
                using (var writer = new Utf8JsonWriter(memoryStream))
                {
                    converter.Write(writer, DBNull.Value, options);
                }
            var actual = Encoding.UTF8.GetString(memoryStream.ToArray());

            Assert.Equal("null", actual);
        }
        public void Write_Null_ShouldReturnNullValue()
        {
            var options   = new JsonSerializerOptions();
            var converter = new DBNullConverter();

            MemoryStream memoryStream;

            using (memoryStream = new MemoryStream())
                using (var writer = new Utf8JsonWriter(memoryStream))
                {
#pragma warning disable CS8625 // Cannot convert null literal to non-nullable reference type.
                    converter.Write(writer, null, options);
#pragma warning restore CS8625 // Cannot convert null literal to non-nullable reference type.
                }
            var actual = Encoding.UTF8.GetString(memoryStream.ToArray());

            Assert.Equal("null", actual);
        }