Render web testcase

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | [#109]
| License       | MIT
| Doc PR        | []

This is the second part of #109.

I refactor admin testcases in a Admin namespace to fit to other bundle.

And one page by block.