public void Read_EmptyString_ShouldReturnDBNull()
{
var options = new JsonSerializerOptions();
var converter = new DBNullConverter();
var json = "\"\"";
var reader = new Utf8JsonReader(Encoding.UTF8.GetBytes(json).AsSpan());
reader.Read();
var actual = converter.Read(ref reader, typeof(DBNull), options);
Assert.Null(actual);
}
public void Read_Zero_ShouldThrowJsonException()
{
var options = new JsonSerializerOptions();
var converter = new DBNullConverter();
var json = "0";
Assert.Throws <JsonException>(() =>
{
var reader = new Utf8JsonReader(Encoding.UTF8.GetBytes(json).AsSpan());
reader.Read();
converter.Read(ref reader, typeof(DBNull), options);
});
}
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);
}
public void CanConvert_String_ShouldReturnFalse()
{
var converter = new DBNullConverter();
Assert.False(converter.CanConvert(typeof(string)));
}
public void CanConvert_DBNull_ShouldReturnTrue()
{
var converter = new DBNullConverter();
Assert.True(converter.CanConvert(typeof(DBNull)));
}
