public async Task ChangeBlobTier_ShouldThrow_WhenBlobUriIsNull() { var context = TestHelpers.CreateGUIDContext(); // Act & Assert: await Assert.ThrowsAsync <ArgumentNullException>(async() => await _storageService.ChangeBlobTierAsync(null, BlobAccessTier.Archive, BlobRehydratePriority.Normal, context).ConfigureAwait(false)).ConfigureAwait(false); }