add simple tests of consistency across rebase types

diff --git a/t/t4038-diff-combined.sh b/t/t4038-diff-combined.sh
index b7e16a7840afc32d36c6a118ed2fa1dbb579476a..1261dbbdf5869b671e36cd7128bfde61fd67b8de 100755 (executable)
--- a/t/t4038-diff-combined.sh
+++ b/t/t4038-diff-combined.sh
@@ -224,4 +224,133 @@ test_expect_success 'check combined output (ignore all spaces)' '
        compare_diff_patch expected actual
 '
 
+test_expect_success 'combine diff coalesce simple' '
+       >test &&
+       git add test &&
+       git commit -m initial &&
+       test_seq 4 >test &&
+       git commit -a -m empty1 &&
+       git branch side1 &&
+       git checkout HEAD^ &&
+       test_seq 5 >test &&
+       git commit -a -m empty2 &&
+       test_must_fail git merge side1 &&
+       >test &&
+       git commit -a -m merge &&
+       git show >actual.tmp &&
+       sed -e "1,/^@@@/d" < actual.tmp >actual &&
+       tr -d Q <<-\EOF >expected &&
+       --1
+       --2
+       --3
+       --4
+       - 5
+       EOF
+       compare_diff_patch expected actual
+'
+
+test_expect_success 'combine diff coalesce tricky' '
+       >test &&
+       git add test &&
+       git commit -m initial --allow-empty &&
+       cat <<-\EOF >test &&
+       3
+       1
+       2
+       3
+       4
+       EOF
+       git commit -a -m empty1 &&
+       git branch -f side1 &&
+       git checkout HEAD^ &&
+       cat <<-\EOF >test &&
+       1
+       3
+       5
+       4
+       EOF
+       git commit -a -m empty2 &&
+       git branch -f side2 &&
+       test_must_fail git merge side1 &&
+       >test &&
+       git commit -a -m merge &&
+       git show >actual.tmp &&
+       sed -e "1,/^@@@/d" < actual.tmp >actual &&
+       tr -d Q <<-\EOF >expected &&
+        -3
+       --1
+        -2
+       --3
+       - 5
+       --4
+       EOF
+       compare_diff_patch expected actual &&
+       git checkout -f side1 &&
+       test_must_fail git merge side2 &&
+       >test &&
+       git commit -a -m merge &&
+       git show >actual.tmp &&
+       sed -e "1,/^@@@/d" < actual.tmp >actual &&
+       tr -d Q <<-\EOF >expected &&
+       - 3
+       --1
+       - 2
+       --3
+        -5
+       --4
+       EOF
+       compare_diff_patch expected actual
+'
+
+test_expect_failure 'combine diff coalesce three parents' '
+       >test &&
+       git add test &&
+       git commit -m initial --allow-empty &&
+       cat <<-\EOF >test &&
+       3
+       1
+       2
+       3
+       4
+       EOF
+       git commit -a -m empty1 &&
+       git checkout -B side1 &&
+       git checkout HEAD^ &&
+       cat <<-\EOF >test &&
+       1
+       3
+       7
+       5
+       4
+       EOF
+       git commit -a -m empty2 &&
+       git branch -f side2 &&
+       git checkout HEAD^ &&
+       cat <<-\EOF >test &&
+       3
+       1
+       6
+       5
+       4
+       EOF
+       git commit -a -m empty3 &&
+       >test &&
+       git add test &&
+       TREE=$(git write-tree) &&
+       COMMIT=$(git commit-tree -p HEAD -p side1 -p side2 -m merge $TREE) &&
+       git show $COMMIT >actual.tmp &&
+       sed -e "1,/^@@@/d" < actual.tmp >actual &&
+       tr -d Q <<-\EOF >expected &&
+       -- 3
+       ---1
+       -  6
+        - 2
+        --3
+         -7
+       - -5
+       ---4
+       EOF
+       compare_diff_patch expected actual
+'
+
 test_done