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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Buffers;
using Microsoft.AspNetCore.InternalTesting;
using Moq;
namespace Microsoft.AspNetCore.WebUtilities;
public class FileBufferingReadStreamTests
{
private Stream MakeStream(int size)
{
// TODO: Fill with random data? Make readonly?
return new MemoryStream(new byte[size]);
}
[Fact]
public void FileBufferingReadStream_Properties_ExpectedValues()
{
using var inner = MakeStream(1024 * 2);
System.IO.Stream bufferSteam;
{
using var stream = new FileBufferingReadStream(inner, 1024, null, Directory.GetCurrentDirectory());
bufferSteam = stream;
Assert.True(stream.CanRead);
Assert.True(stream.CanSeek);
Assert.False(stream.CanWrite);
Assert.Equal(0, stream.Length); // Nothing buffered yet
Assert.Equal(0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
}
Assert.False(bufferSteam.CanRead); // Buffered Stream now disposed
Assert.False(bufferSteam.CanSeek);
Assert.True(inner.CanRead); // Inner Stream not disposed
Assert.True(inner.CanSeek);
}
[Fact]
public void FileBufferingReadStream_Sync0ByteReadUnderThreshold_DoesntCreateFile()
{
var inner = MakeStream(1024);
using (var stream = new FileBufferingReadStream(inner, 1024 * 2, null, Directory.GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = stream.Read(bytes, 0, 0);
Assert.Equal(0, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read2 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read3 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
}
[Fact]
public void FileBufferingReadStream_SyncReadUnderThreshold_DoesntCreateFile()
{
var inner = MakeStream(1024 * 2);
using (var stream = new FileBufferingReadStream(inner, 1024 * 3, null, Directory.GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read2 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read3 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
}
[Fact]
public void FileBufferingReadStream_SyncReadOverThreshold_CreatesFile()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 1024, null, GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
var read2 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
Assert.True(File.Exists(tempFileName));
var read3 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public void FileBufferingReadStream_SyncReadWithInMemoryLimit_EnforcesLimit()
{
var inner = MakeStream(1024 * 2);
using (var stream = new FileBufferingReadStream(inner, 1024, 900, Directory.GetCurrentDirectory()))
{
var bytes = new byte[500];
var read0 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var exception = Assert.Throws<IOException>(() => stream.Read(bytes, 0, bytes.Length));
Assert.Equal("Buffer limit exceeded.", exception.Message);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
Assert.False(File.Exists(stream.TempFileName));
}
}
[Fact]
public void FileBufferingReadStream_SyncReadWithOnDiskLimit_EnforcesLimit()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 512, 1024, GetCurrentDirectory()))
{
var bytes = new byte[500];
var read0 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
var exception = Assert.Throws<IOException>(() => stream.Read(bytes, 0, bytes.Length));
Assert.Equal("Buffer limit exceeded.", exception.Message);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
}
Assert.False(File.Exists(tempFileName));
}
///////////////////
[Fact]
public async Task FileBufferingReadStream_Async0ByteReadUnderThreshold_DoesntCreateFile()
{
var inner = MakeStream(1024);
using (var stream = new FileBufferingReadStream(inner, 1024 * 2, null, Directory.GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = await stream.ReadAsync(bytes, 0, 0);
Assert.Equal(0, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read2 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read3 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
}
[Fact]
public async Task FileBufferingReadStream_AsyncReadUnderThreshold_DoesntCreateFile()
{
var inner = MakeStream(1024 * 2);
using (var stream = new FileBufferingReadStream(inner, 1024 * 3, null, Directory.GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read2 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read3 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
}
[Fact]
public async Task FileBufferingReadStream_AsyncReadOverThreshold_CreatesFile()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 1024, null, GetCurrentDirectory()))
{
var bytes = new byte[1000];
var read0 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
var read2 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1, read2);
Assert.Equal(read0 + read1 + read2, stream.Length);
Assert.Equal(read0 + read1 + read2, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
Assert.True(File.Exists(tempFileName));
var read3 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(0, read3);
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public async Task FileBufferingReadStream_Async0ByteReadAfterBuffering_ReadsFromFile()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 1024, null, GetCurrentDirectory()))
{
await stream.DrainAsync(default);
stream.Position = 0;
Assert.Equal(inner.Length, stream.Length);
Assert.Equal(0, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
var bytes = new byte[1000];
var read0 = await stream.ReadAsync(bytes, 0, 0);
Assert.Equal(0, read0);
Assert.Equal(read0, stream.Position);
var read1 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Position);
var read2 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read2);
Assert.Equal(read0 + read1 + read2, stream.Position);
var read3 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(inner.Length - read0 - read1 - read2, read3);
Assert.Equal(read0 + read1 + read2 + read3, stream.Length);
Assert.Equal(read0 + read1 + read2 + read3, stream.Position);
var read4 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(0, read4);
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public async Task FileBufferingReadStream_AsyncReadWithInMemoryLimit_EnforcesLimit()
{
var inner = MakeStream(1024 * 2);
using (var stream = new FileBufferingReadStream(inner, 1024, 900, Directory.GetCurrentDirectory()))
{
var bytes = new byte[500];
var read0 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var exception = await Assert.ThrowsAsync<IOException>(() => stream.ReadAsync(bytes, 0, bytes.Length));
Assert.Equal("Buffer limit exceeded.", exception.Message);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
Assert.False(File.Exists(stream.TempFileName));
}
}
[Fact]
public async Task FileBufferingReadStream_AsyncReadWithOnDiskLimit_EnforcesLimit()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 512, 1024, GetCurrentDirectory()))
{
var bytes = new byte[500];
var read0 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.True(stream.InMemory);
Assert.Null(stream.TempFileName);
var read1 = await stream.ReadAsync(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read1);
Assert.Equal(read0 + read1, stream.Length);
Assert.Equal(read0 + read1, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
var exception = await Assert.ThrowsAsync<IOException>(() => stream.ReadAsync(bytes, 0, bytes.Length));
Assert.Equal("Buffer limit exceeded.", exception.Message);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public void FileBufferingReadStream_UsingMemoryStream_RentsAndReturnsRentedBuffer_WhenCopyingFromMemoryStreamDuringRead()
{
var inner = MakeStream(1024 * 1024 + 25);
string tempFileName;
var arrayPool = new Mock<ArrayPool<byte>>();
arrayPool.Setup(p => p.Rent(It.IsAny<int>()))
.Returns((int m) => ArrayPool<byte>.Shared.Rent(m));
arrayPool.Setup(p => p.Return(It.IsAny<byte[]>(), It.IsAny<bool>()))
.Callback((byte[] bytes, bool clear) => ArrayPool<byte>.Shared.Return(bytes, clear));
using (var stream = new FileBufferingReadStream(inner, 1024 * 1024 + 1, 2 * 1024 * 1024, GetCurrentDirectory(), arrayPool.Object))
{
arrayPool.Verify(v => v.Rent(It.IsAny<int>()), Times.Never());
stream.Read(new byte[1024 * 1024]);
Assert.False(File.Exists(stream.TempFileName), "tempFile should not be created as yet");
stream.Read(new byte[4]);
Assert.True(File.Exists(stream.TempFileName), "tempFile should be created");
tempFileName = stream.TempFileName!;
arrayPool.Verify(v => v.Rent(It.IsAny<int>()), Times.Once());
arrayPool.Verify(v => v.Return(It.IsAny<byte[]>(), It.IsAny<bool>()), Times.Once());
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public async Task FileBufferingReadStream_UsingMemoryStream_RentsAndReturnsRentedBuffer_WhenCopyingFromMemoryStreamDuringReadAsync()
{
var inner = MakeStream(1024 * 1024 + 25);
string tempFileName;
var arrayPool = new Mock<ArrayPool<byte>>();
arrayPool.Setup(p => p.Rent(It.IsAny<int>()))
.Returns((int m) => ArrayPool<byte>.Shared.Rent(m));
arrayPool.Setup(p => p.Return(It.IsAny<byte[]>(), It.IsAny<bool>()))
.Callback((byte[] bytes, bool clear) => ArrayPool<byte>.Shared.Return(bytes, clear));
using (var stream = new FileBufferingReadStream(inner, 1024 * 1024 + 1, 2 * 1024 * 1024, GetCurrentDirectory(), arrayPool.Object))
{
arrayPool.Verify(v => v.Rent(It.IsAny<int>()), Times.Never());
await stream.ReadAsync(new byte[1024 * 1024]);
Assert.False(File.Exists(stream.TempFileName), "tempFile should not be created as yet");
await stream.ReadAsync(new byte[4]);
Assert.True(File.Exists(stream.TempFileName), "tempFile should be created");
tempFileName = stream.TempFileName!;
arrayPool.Verify(v => v.Rent(It.IsAny<int>()), Times.Once());
arrayPool.Verify(v => v.Return(It.IsAny<byte[]>(), It.IsAny<bool>()), Times.Once());
}
Assert.False(File.Exists(tempFileName));
}
[Fact]
public async Task CopyToAsyncWorks()
{
// 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).ToArray();
var inner = new MemoryStream(data);
using var stream = new FileBufferingReadStream(inner, 1024 * 1024, 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);
}
[Fact]
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);
}
[Fact]
public async Task ReadAsyncThenCopyToAsyncWorks()
{
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];
await stream.ReadAsync(buffer);
await stream.CopyToAsync(withoutBufferMs);
Assert.Equal(data.AsMemory(0, 100).ToArray(), buffer);
Assert.Equal(data.AsMemory(100).ToArray(), withoutBufferMs.ToArray());
}
[Fact]
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());
}
[Fact]
public async Task ReadThenSeekThenCopyToAsyncWorks()
{
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);
stream.Position = 0;
await stream.CopyToAsync(withoutBufferMs);
Assert.Equal(100, read);
Assert.Equal(data.AsMemory(0, read).ToArray(), buffer);
Assert.Equal(data.ToArray(), withoutBufferMs.ToArray());
}
[Fact]
public void PartialReadThenSeekReplaysBuffer()
{
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 read1 = stream.Read(buffer);
stream.Position = 0;
var buffer2 = new byte[200];
var read2 = stream.Read(buffer2);
Assert.Equal(100, read1);
Assert.Equal(100, read2);
Assert.Equal(data.AsMemory(0, read1).ToArray(), buffer);
Assert.Equal(data.AsMemory(0, read2).ToArray(), buffer2.AsMemory(0, read2).ToArray());
}
[Fact]
public async Task PartialReadAsyncThenSeekReplaysBuffer()
{
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 read1 = await stream.ReadAsync(buffer);
stream.Position = 0;
var buffer2 = new byte[200];
var read2 = await stream.ReadAsync(buffer2);
Assert.Equal(100, read1);
Assert.Equal(100, read2);
Assert.Equal(data.AsMemory(0, read1).ToArray(), buffer);
Assert.Equal(data.AsMemory(0, read2).ToArray(), buffer2.AsMemory(0, read2).ToArray());
}
[ConditionalFact]
[OSSkipCondition(OperatingSystems.Windows, SkipReason = "UnixFileMode is not supported on Windows.")]
public void Read_BufferingContentToDisk_CreatesFileWithUserOnlyUnixFileMode()
{
var inner = MakeStream(1024 * 2);
string tempFileName;
using (var stream = new FileBufferingReadStream(inner, 1024, null, GetCurrentDirectory()))
{
var bytes = new byte[1024 * 2];
var read0 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(bytes.Length, read0);
Assert.Equal(read0, stream.Length);
Assert.Equal(read0, stream.Position);
Assert.False(stream.InMemory);
Assert.NotNull(stream.TempFileName);
var read1 = stream.Read(bytes, 0, bytes.Length);
Assert.Equal(0, read1);
tempFileName = stream.TempFileName!;
Assert.True(File.Exists(tempFileName));
Assert.Equal(UnixFileMode.UserRead | UnixFileMode.UserWrite, File.GetUnixFileMode(tempFileName));
}
Assert.False(File.Exists(tempFileName));
}
private static string GetCurrentDirectory()
{
return AppContext.BaseDirectory;
}
private class NumberOfWritesMemoryStream : MemoryStream
{
public int NumberOfWrites { get; set; }
public override void Write(byte[] buffer, int offset, int count)
{
NumberOfWrites++;
base.Write(buffer, offset, count);
}
public override void Write(ReadOnlySpan<byte> source)
{
NumberOfWrites++;
base.Write(source);
}
}
}
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