Create test setup for Library

[Keats]

The main issue is that it's painful to get a real library loaded without just creating some files and commit them. Ideally there would be a function/macro that can be used to create pages/sections.
The other files in the library component create whatever is needed manually but it makes tests very verbose/long where 90% of the test is actually setup.
The library.rs really needs some more testing and to rely less on integration tests.

[savente93]

Am looking into creating some more ergonomic setup functions for the library component to help with the benchmarking, so I might as well look into this one too. Are there specific tests that you want to see? they might be a bit verbose as you say but the component seems tested well enough to me

[Keats]

Probably just replace the current tests for now. I had some ideas when I wrote that issue but I forgot them.
Essentially, we have lots of tests in site/tests that might be able to be unit-tested instead