You started the import prior to the addition of the test post, which is why nothing was imported. I've reset your import and you can start it again at your convenience.
However, if you're trying to use "import" as a way to have anything posted to that Tumblr account to be automatically added to WordPress as it's posted, that's not how the import feature works. Importing is a one-time function that will bring in content from an export file that you've exported from another blogging service. There is no way to set up auto-posting from Tumblr or any other service to WordPress.com.
You can create posts on your WordPress.com account and have them auto update your Tumblr account by enabling Publicize for Tumblr. Here's more information on that particular service:
I hope that clarifies things. Let me know if you have any further questions.