Added automated 200 testing for admin

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | ... pending
| Fixed tickets | #216 
| License       | MIT
| Doc PR        | 

- Only works on non-parameterized routes.
- Code is slightly ugly as we cannot determine if a route needs a POST.
- The export route has an undefined requirement on "_format".