branch: allow a no-op "branch -M <current-branch> HEAD"

diff --git a/t/t3409-rebase-preserve-merges.sh b/t/t3409-rebase-preserve-merges.sh
index 19341e5ca1c7f415afdf2c82f67930b8fed5478b..6de4e2263f9ec65d2de2e28af6a12d5c1065f686 100755 (executable)
--- a/t/t3409-rebase-preserve-merges.sh
+++ b/t/t3409-rebase-preserve-merges.sh
@@ -27,7 +27,25 @@ export GIT_AUTHOR_EMAIL
 #    \
 #     B2       <-- origin/topic
 #
-# In both cases, 'topic' is rebased onto 'origin/topic'.
+# Clone 3 (no-ff merge):
+#
+# A1--A2--B3   <-- origin/master
+#  \
+#   B1------M  <-- topic
+#    \     /
+#     \--A3    <-- topic2
+#      \
+#       B2     <-- origin/topic
+#
+# Clone 4 (merge using second parent as base):
+#
+# A1--A2--B3   <-- origin/master
+#  \
+#   B1--A3--M  <-- topic
+#    \     /
+#     \--A4    <-- topic2
+#      \
+#       B2     <-- origin/topic
 
 test_expect_success 'setup for merge-preserving rebase' \
        'echo First > A &&
@@ -47,6 +65,13 @@ test_expect_success 'setup for merge-preserving rebase' \
        git merge origin/master
        ) &&
 
+       git clone ./. clone4 &&
+       (
+               cd clone4 &&
+               git checkout -b topic origin/topic &&
+               git merge origin/master
+       ) &&
+
        echo Fifth > B &&
        git add B &&
        git commit -m "Add different B" &&
@@ -61,6 +86,16 @@ test_expect_success 'setup for merge-preserving rebase' \
                git commit -m "Merge origin/master into topic"
        ) &&
 
+       git clone ./. clone3 &&
+       (
+               cd clone3 &&
+               git checkout -b topic2 origin/topic &&
+               echo Sixth > A &&
+               git commit -a -m "Modify A3" &&
+               git checkout -b topic origin/topic &&
+               git merge --no-ff topic2
+       ) &&
+
        git checkout topic &&
        echo Fourth >> B &&
        git commit -a -m "Modify B2"
@@ -93,4 +128,25 @@ test_expect_success '--continue works after a conflict' '
        )
 '
 
+test_expect_success 'rebase -p preserves no-ff merges' '
+       (
+       cd clone3 &&
+       git fetch &&
+       git rebase -p origin/topic &&
+       test 3 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Merge branch" | wc -l)
+       )
+'
+
+test_expect_success 'rebase -p works when base inside second parent' '
+       (
+       cd clone4 &&
+       git fetch &&
+       git rebase -p HEAD^2 &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Modify B" | wc -l) &&
+       test 1 = $(git rev-list --all --pretty=oneline | grep "Merge remote-tracking branch " | wc -l)
+       )
+'
+
 test_done