Browser tests to make sure Special:EnableFlow doesn't break unexpectedly.
Three tests: Existing page, New board, Subpage
Here's a description of what needs to be tested:
For a page that doesn't exist, it's simple -- it creates a new Flow board.
For a page that does exist as wikitext:
-- The wikitext page (Talk:Foo) moves to an archive subpage (Talk:Foo/Archive 1).
-- If there's an existing archive subpage in the form (Talk:Foo/Archive 1), the wikitext page moves to (Talk:Foo/Archive 2), based on the next number after the last existing archive page.
-- A template is added to the Flow side rail: {{Wikitext talk page converted to Flow|archive=PAGENAME/Archive X|date=2015-XX-XX}}
-- If the wikitext page has a template above the first heading, the template is copied into the side rail of the new Flow board. Any other wikitext on the page does not get copied.