Add more specific HTML testing for views

[AdrianDAlessandro]

The template views currently only test that the correct template is used, but do not test any of the contents of the rendered page.

Implementation options:

• The request object returned in Django tests can be investigated as a string (ie using regex), however this approach is limited
• One more complete approach to writing these tests is to use BeautifulSoup, like in the following example PR: Use Beautifulsoup for beautiful HTML tests ImperialCollegeLondon/imperial_coldfront_plugin#308

[AdrianDAlessandro]

@sbland Any progress on this?

[sbland]

@AdrianDAlessandro I've set this up here with an example test: #623

I also suggest implementing some more domain driven testing based on user stories. We could look at e2e testing or just using beautiful soup with tests that cover more than one view. These should focus on replicating user interactions to reach a goal and can ensure we are meeting some accessibility requirements. I'll put an example in the PR for discussion.

[AdrianDAlessandro]

@sbland Thanks, I've reviewed that PR

I like the idea of domain-driven testing. Can you open a separate issue for that? Would be good to include some specifics about how that might be implemented and which workflows/interactions to test (perhaps each of those can be a sub issue to break the task down a bit)