public void Given_a_length_limited_stream_when_doing_something_other_than_reading_then_expect_it_to_throw()
{
using (var ms = new MemoryStream())
using (var lls = ms.VirtualLength(3)) {
Assert.Throws<NotSupportedException>(() => lls.Write(new byte[5], 0, 5));
Assert.Throws<NotSupportedException>(() => lls.SetLength(5));
}
}
public void Given_some_data_when_length_limited_to_3_bytes_and_read_to_end_with_zero_buffering_then_read_data_is_as_expected_and_position_has_not_exceeeded_limit()
{
using (var ms = new MemoryStream()) {
ms.Write(_data, 0, _data.Length);
ms.Position = 0;
using (var lls = ms.VirtualLength(3)) {
Assert.That(lls.ReadByte() == _expected[0]);
Assert.That(lls.ReadByte() == _expected[1]);
Assert.That(lls.ReadByte() == _expected[2]);
Assert.That(ms.Position, Is.EqualTo(3));
}
}
}
public void Given_some_data_when_length_limited_to_3_bytes_and_read_to_end_with_default_buffering_then_read_data_is_as_expected_and_position_has_not_exceeeded_limit()
{
using (var ms = new MemoryStream()) {
ms.Write(_data, 0, _data.Length);
ms.Position = 0;
using (var lls = ms.VirtualLength(3))
using (var sr = new StreamReader(lls)) {
var result = sr.ReadToEnd();
Assert.AreEqual(_expected, result);
Assert.That(ms.Position, Is.EqualTo(3));
}
ms.Position = 0;
using (var lls = ms.VirtualLength(3)) {
Assert.That(lls.ReadByte() == '{');
Assert.That(lls.ReadByte() == ' ');
Assert.That(lls.ReadByte() == '}');
Assert.That(ms.Position, Is.EqualTo(3));
}
}
}
public void Given_some_data_when_length_limited_to_3_bytes_and_read_first_3_bytes_individually_with_minimal_buffering_then_read_data_is_as_expected_and_position_has_not_exceeeded_limit()
{
using (var ms = new MemoryStream()) {
ms.Write(_data, 0, _data.Length);
ms.Position = 0;
using (var lls = ms.VirtualLength(3))
using (var sr = new StreamReader(lls, Encoding.UTF8, false, 1)) {
Assert.That(sr.Read() == _expected[0]);
Assert.That(sr.Read() == _expected[1]);
Assert.That(sr.Read() == _expected[2]);
Assert.That(ms.Position, Is.EqualTo(3));
}
}
}
