I have added these tests for only Jekyll's debugging purpose [1]. I needed to verify that Liquid was *NOT* wrong. Now the bug is fixed, in my opinion, these tests may be useless. If you think so, ignore this pull request. It's okay.

By the way, my pull request to Jekyll is not merged yet. Would you check the thread and leave any comment, especially on `Tag#blank?` ?

Thank you in advance.

[1]: [Liquid doesn't render my partial · Issue #1519 · mojombo/jekyll](https://github.com/mojombo/jekyll/issues/1519)
[2]: [a patch for the issue #1519: Liquid doesn't render my partial by zerobase · Pull Request #1525 · mojombo/jekyll](https://github.com/mojombo/jekyll/pull/1525)