[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);
        }
    }