public async Task CopyToAsyncWorksWithFileThreshold()
{
var data = Enumerable.Range(0, 1024).Select(b => (byte)b).Reverse().ToArray();
var inner = new MemoryStream(data);
using var stream = new FileBufferingReadStream(inner, 100, bufferLimit: null, GetCurrentDirectory());
var withoutBufferMs = new MemoryStream();
await stream.CopyToAsync(withoutBufferMs);
var withBufferMs = new MemoryStream();
stream.Position = 0;
await stream.CopyToAsync(withBufferMs);
Assert.Equal(data, withoutBufferMs.ToArray());
Assert.Equal(data, withBufferMs.ToArray());
}
public async Task CopyToAsyncWorksWithFileThreshold()
{
// 4K is the lower bound on buffer sizes
var bufferSize = 4096;
var mostExpectedWrites = 8;
var data = Enumerable.Range(0, bufferSize * mostExpectedWrites).Select(b => (byte)b).Reverse().ToArray();
var inner = new MemoryStream(data);
using var stream = new FileBufferingReadStream(inner, 100, bufferLimit: null, GetCurrentDirectory());
var withoutBufferMs = new NumberOfWritesMemoryStream();
await stream.CopyToAsync(withoutBufferMs);
var withBufferMs = new NumberOfWritesMemoryStream();
stream.Position = 0;
await stream.CopyToAsync(withBufferMs);
Assert.Equal(data, withoutBufferMs.ToArray());
Assert.Equal(mostExpectedWrites, withoutBufferMs.NumberOfWrites);
Assert.Equal(data, withBufferMs.ToArray());
Assert.InRange(withBufferMs.NumberOfWrites, 1, mostExpectedWrites);
}
public async Task ReadThenCopyToAsyncWorks()
{
var data = Enumerable.Range(0, 1024).Select(b => (byte)b).ToArray();
var inner = new MemoryStream(data);
using var stream = new FileBufferingReadStream(inner, 1024 * 1024, bufferLimit: null, GetCurrentDirectory());
var withoutBufferMs = new MemoryStream();
var buffer = new byte[100];
var read = stream.Read(buffer);
await stream.CopyToAsync(withoutBufferMs);
Assert.Equal(100, read);
Assert.Equal(data.AsMemory(0, read).ToArray(), buffer);
Assert.Equal(data.AsMemory(read).ToArray(), withoutBufferMs.ToArray());
}
