builtin-merge: show user-friendly error messages for fast-forward too.

diff --git a/t/t7603-merge-reduce-heads.sh b/t/t7603-merge-reduce-heads.sh
index b47b7b9757dffe2d3d41127b43ffa929505c0e77..7e17eb490d4b1f4ac275a7033562aaa6693181ab 100755 (executable)
--- a/t/t7603-merge-reduce-heads.sh
+++ b/t/t7603-merge-reduce-heads.sh
@@ -60,4 +60,57 @@ test_expect_success 'merge c1 with c2, c3, c4, c5' '
        test -f c5.c
 '
 
+test_expect_success 'setup' '
+       for i in A B C D E
+       do
+               echo $i > $i.c &&
+               git add $i.c &&
+               git commit -m $i &&
+               git tag $i
+       done &&
+       git reset --hard A &&
+       for i in F G H I
+       do
+               echo $i > $i.c &&
+               git add $i.c &&
+               git commit -m $i &&
+               git tag $i
+       done
+'
+
+test_expect_success 'merge E and I' '
+       git reset --hard A &&
+       git merge E I
+'
+
+test_expect_success 'verify merge result' '
+       test $(git rev-parse HEAD^1) = $(git rev-parse E) &&
+       test $(git rev-parse HEAD^2) = $(git rev-parse I)
+'
+
+test_expect_success 'add conflicts' '
+       git reset --hard E &&
+       echo foo > file.c &&
+       git add file.c &&
+       git commit -m E2 &&
+       git tag E2 &&
+       git reset --hard I &&
+       echo bar >file.c &&
+       git add file.c &&
+       git commit -m I2 &&
+       git tag I2
+'
+
+test_expect_success 'merge E2 and I2, causing a conflict and resolve it' '
+       git reset --hard A &&
+       test_must_fail git merge E2 I2 &&
+       echo baz > file.c &&
+       git add file.c &&
+       git commit -m "resolve conflict"
+'
+
+test_expect_success 'verify merge result' '
+       test $(git rev-parse HEAD^1) = $(git rev-parse E2) &&
+       test $(git rev-parse HEAD^2) = $(git rev-parse I2)
+'
 test_done