public async Task BeginRead_CanReadAfterLength()
{
// Arrange
var originalText = "This is the whole text.";
var range = new RangeItemHeaderValue(0L, null);
var data = new byte[25];
var callback = new AsyncCallback(_ => { });
var userState = new object();
using (var innerStream = new MemoryStream())
using (var writer = new StreamWriter(innerStream))
{
await writer.WriteAsync(originalText);
await writer.FlushAsync();
using (var rangeStream = new ByteRangeStream(innerStream, range))
{
rangeStream.Position = 50L;
// Act
var result = rangeStream.BeginRead(data, 0, data.Length, callback, userState);
var read = rangeStream.EndRead(result);
// Assert
Assert.Equal(0, read);
}
}
}
public void BeginRead_ReadsEffectiveLengthBytes(
int from,
int to,
int innerLength,
int effectiveLength
)
{
// Arrange
var mockInnerStream = new Mock <Stream>();
mockInnerStream.Setup(s => s.CanSeek).Returns(true);
mockInnerStream.Setup(s => s.Length).Returns(innerLength);
var range = new RangeItemHeaderValue(from, to);
var data = new byte[25];
var offset = 5;
var callback = new AsyncCallback(_ => { });
var userState = new object();
using (var rangeStream = new ByteRangeStream(mockInnerStream.Object, range))
{
// Act
var result = rangeStream.BeginRead(data, offset, data.Length, callback, userState);
rangeStream.EndRead(result);
// Assert
mockInnerStream.Verify(
s => s.BeginRead(data, offset, effectiveLength, callback, userState),
Times.Once()
);
Assert.Equal(effectiveLength, rangeStream.Position);
}
}