rank: add minimal test
This adds a small test checking the rank computation in the case of a merge.
Differential Revision: https://phab.mercurial-scm.org/D12141
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-rank.t Fri Jan 28 11:45:18 2022 +0100
@@ -0,0 +1,38 @@
+=============================================================
+Check that we can compute and exchange revision rank properly
+=============================================================
+
+ $ cat << EOF >> $HGRCPATH
+ > [format]
+ > exp-use-changelog-v2=enable-unstable-format-and-corrupt-my-data
+ > EOF
+
+
+Test minimal rank computation with merge
+
+ $ hg init rank-repo-minimal
+ $ cd rank-repo-minimal
+ $ touch 0
+ $ hg commit -Aqm 0
+ $ touch 1
+ $ hg commit -Aqm 1
+ $ hg update -qr 0
+ $ touch 2
+ $ hg commit -Aqm 2
+ $ hg merge -qr 1
+ $ hg commit -m 3
+ $ touch 4
+ $ hg commit -Aqm 4
+ $ hg log --graph --template '{rev} {_fast_rank}\n'
+ @ 4 5
+ |
+ o 3 4
+ |\
+ | o 2 2
+ | |
+ o | 1 2
+ |/
+ o 0 1
+
+ $ cd ..
+