public async Task CopyAsync_Always_Throws()
{
var destinationStorage = CreateNewFileStorage();
var sourceFileUri = _storage.ResolveUri("a");
var destinationFileUri = destinationStorage.ResolveUri("a");
await Assert.ThrowsAsync <NotImplementedException>(
() => _storage.CopyAsync(
sourceFileUri,
destinationStorage,
destinationFileUri,
destinationProperties: null,
cancellationToken: CancellationToken.None));
}