Add pinning tests for current implementation

This adds a temporary [pinning test][1] to record the current behaviour
of the Ultimate version of the Security Configuration page, so as to
support the refactoring work in the next commit.

Once the work has been done, these tests can be removed, having served
their purpose.

[1]: https://web.archive.org/web/20170826101146/http://wiki.c2.com/?PinningTests