Between this commit and the previous one, this brings test coverage
for `Livecheck::Strategy` up to 98.18% line coverage and 97.22%
branch coverage. The only uncovered areas are some Sorbet `params`
calls (which I'm not sure how to cover) and a conditional `break` in
`page_headers` that will be refactored away in the future.
The increased coverage is primarily in areas that weren't covered
before because they call methods that make network requests. I worked
around this with stubs and doubles, so we can test this code to some
degree. I plan to expand this approach to other areas in livecheck
that aren't covered for the same reason and that should significantly
increase test coverage (along with some other test improvements that
I have lined up).
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