public void TestReadBytesToBuffer()
{
int called = 0;
FromUnseekableStream.StreamFactory factory = delegate() { ++called; return(new MemoryStream(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 })); };
var streamWrapper = new FromUnseekableStream(factory, 5);
var buffer = new byte[10];
streamWrapper.ReadBytesToBuffer(buffer, 0, 3);
Assert.Equal(0, buffer[0]);
Assert.Equal(2, buffer[2]);
streamWrapper.ReadBytesToBuffer(buffer, 3, 2, 3);
Assert.Equal(2, buffer[2]);
Assert.Equal(3, buffer[3]);
Assert.Equal(4, buffer[4]);
streamWrapper.ReadBytesToBuffer(buffer, 5, 2, 5);
Assert.Equal(5, buffer[5]);
Assert.Equal(6, buffer[6]);
// this should be cached
streamWrapper.ReadBytesToBuffer(buffer, 2, 3, 0);
Assert.Equal(2, buffer[0]);
Assert.Equal(3, buffer[1]);
Assert.Equal(4, buffer[2]);
// this should be uncached
streamWrapper.ReadBytesToBuffer(buffer, 0, 2, 7);
Assert.Equal(0, buffer[7]);
Assert.Equal(1, buffer[8]);
// this should be partially cached and not create a new stream
streamWrapper.ReadBytesToBuffer(buffer, 0, 7, 0);
Assert.Equal(0, buffer[0]);
Assert.Equal(1, buffer[1]);
Assert.Equal(6, buffer[6]);
Assert.Equal(3, called);
}
