public void MoveForward_doesnt_cause_more_data_to_be_read_when_a_padding_buffer_is_supplied()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => l);
var buf = new SlidingStreamBuffer(streamMock.Object, window, 3);
buf.Warmup();
buf.MoveForward(1);
buf.MoveForward(1);
buf.MoveForward(1);
buf.GetByteAt(0);
streamMock.Verify(x =>
x.Read(
It.IsAny<byte[]>(),
It.IsAny<int>(),
It.IsAny<int>()),
Times.Exactly(1));
}
public void GetByteAt_retrieves_correct_byte()
{
int window = 100;
var buffer = new byte[window];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return actualLength;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(buffer[5], buf.GetByteAt(5));
}
public void GetByteAt_throws_exception_for_negative_index()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => 50);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.GetByteAt(-1);
}
public void GetByteAt_calls_warmup_if_necessary()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => 50);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.GetByteAt(0);
streamMock.VerifyAll();
}