public async Task FileChangeDetectTest()
{
using var hashAlgorithm = System.Security.Cryptography.SHA1.Create();
using var testStream = new MemoryStream(new byte[] { 1, 2, 3 });
using var writer = new StreamWriter(testStream);
using var hashStream = new MemoryStream(hashAlgorithm.ComputeHash(new byte[] { 1, 2, 3 }));
var changeDetector = new ChangeDetector(hashAlgorithm);
Assert.Null(await changeDetector.DetectAsync(file: testStream, hash: hashStream).ConfigureAwait(false));
testStream.Position = 0;
await writer.WriteAsync('.').ConfigureAwait(false);
await writer.FlushAsync().ConfigureAwait(false);
Assert.NotNull(await changeDetector.DetectAsync(file: testStream, hash: hashStream).ConfigureAwait(false));
}