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Which issue does this PR close?
N/A.
Rationale for this change
Using succinct test utility functions instead of verbose constructions, making some downstream-useful test utils crate-public.
What changes are included in this PR?
Verbose usages in unit tests of
join_selection.rs
is cleaned up, three useful test utils are made crate-public for facilitating DRY in forks.Are these changes tested?
Yes, by existing tests.
Are there any user-facing changes?
No, only three useful test utils are now crate-accessible by devs.