test-reach: test get_merge_bases_many
The get_merge_bases_many method returns a list of merge bases for a single commit (A) against a list of commits (X). Some care is needed in constructing the expected behavior because the result is not the expected merge-base for an octopus merge with those parents but instead the set of maximal commits that are reachable from A and at least one of the commits in X. Add get_merge_bases_many to 'test-tool reach' and create a test that demonstrates that this output returns multiple results. Specifically, we select a list of three commits such that we output two commits that are reachable from one of the first two, respectively, and none are reachable from the third. Signed-off-by: NDerrick Stolee <dstolee@microsoft.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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