public void Seek_ThrowsIfBeforeOrigin(int offset, SeekOrigin origin)
{
// Arrange
var mockInnerStream = new Mock <Stream>();
mockInnerStream.Setup(s => s.CanSeek).Returns(true);
mockInnerStream.Setup(s => s.Length).Returns(10L);
var range = new RangeItemHeaderValue(0, 25L);
using (var rangeStream = new ByteRangeStream(mockInnerStream.Object, range))
{
// Act & Assert
Assert.Throws <IOException>(() => rangeStream.Seek(offset, origin));
}
}
public void Seek_CanMoveAfterLength(int offset, SeekOrigin origin)
{
// Arrange
var expectedPosition = 25L;
var mockInnerStream = new Mock <Stream>();
mockInnerStream.Setup(s => s.CanSeek).Returns(true);
mockInnerStream.Setup(s => s.Length).Returns(10L);
var range = new RangeItemHeaderValue(0L, 10L);
using (var rangeStream = new ByteRangeStream(mockInnerStream.Object, range))
{
// Act
var newPosition = rangeStream.Seek(offset, origin);
// Assert
Assert.Equal(expectedPosition, newPosition);
Assert.Equal(expectedPosition, rangeStream.Position);
}
}
public async Task Seek_PositionsNextRead(int offset, SeekOrigin origin)
{
// Arrange
var originalText = "890123456789";
var range = new RangeItemHeaderValue(2L, null);
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))
{
// Act
rangeStream.Seek(offset, origin);
// Assert
var read = rangeStream.ReadByte();
Assert.Equal('5', (char)read);
}
}
}