public async Task InitializeEnsuresContainerExists()
{
var mockTenantBlobContainer = new Mock <IAzureBlobContainer <Tenant> >();
var store = new TenantStore(mockTenantBlobContainer.Object, new Mock <IAzureBlobContainer <byte[]> >().Object);
await store.InitializeAsync();
mockTenantBlobContainer.Verify(c => c.EnsureExistsAsync(), Times.Once());
}