t4200: demonstrate rerere segfault on specially crafted merge

diff --git a/t/t7606-merge-custom.sh b/t/t7606-merge-custom.sh
index 82045cd543e7e62cd1dc0fa3c38d7d5212f32090..8e8c4d72464098e1c75805e48bb5907e34e9532c 100755 (executable)
--- a/t/t7606-merge-custom.sh
+++ b/t/t7606-merge-custom.sh
@@ -4,11 +4,13 @@ test_description="git merge
 
 Testing a custom strategy.
 
-*   (HEAD, master) Merge commit 'c2'
+*   (HEAD, master) Merge commit 'c3'
 |\
-| * (tag: c2) c2
+| * (tag: c3) c3
 * | (tag: c1) c1
 |/
+| * tag: c2) c2
+|/
 * (tag: c0) c0
 "
 
@@ -31,7 +33,9 @@ test_expect_success 'setup' '
        git reset --keep c0 &&
        echo c1c1 >c1.c &&
        git add c1.c &&
-       test_commit c2 c2.c
+       test_commit c2 c2.c &&
+       git reset --keep c0 &&
+       test_commit c3 c3.c
 '
 
 test_expect_success 'merge c2 with a custom strategy' '
@@ -42,7 +46,7 @@ test_expect_success 'merge c2 with a custom strategy' '
        git rev-parse c2^{tree} >tree.expected &&
        git merge -s theirs c2 &&
 
-       git rev-parse HEAD >head &&
+       git rev-parse HEAD >head.new &&
        git rev-parse HEAD^1 >first-parent &&
        git rev-parse HEAD^2 >second-parent &&
        git rev-parse HEAD^{tree} >tree &&
@@ -51,7 +55,7 @@ test_expect_success 'merge c2 with a custom strategy' '
        git diff --exit-code c2 HEAD &&
        git diff --exit-code c2 &&
 
-       ! test_cmp head.old head &&
+       ! test_cmp head.old head.new &&
        test_cmp head.old first-parent &&
        test_cmp second-parent.expected second-parent &&
        test_cmp tree.expected tree &&
@@ -60,4 +64,30 @@ test_expect_success 'merge c2 with a custom strategy' '
        test -f c2.c
 '
 
+test_expect_success 'trivial merge with custom strategy' '
+       git reset --hard c1 &&
+
+       git rev-parse c1 >head.old &&
+       git rev-parse c3 >second-parent.expected &&
+       git rev-parse c3^{tree} >tree.expected &&
+       git merge -s theirs c3 &&
+
+       git rev-parse HEAD >head.new &&
+       git rev-parse HEAD^1 >first-parent &&
+       git rev-parse HEAD^2 >second-parent &&
+       git rev-parse HEAD^{tree} >tree &&
+       git update-index --refresh &&
+       git diff --exit-code &&
+       git diff --exit-code c3 HEAD &&
+       git diff --exit-code c3 &&
+
+       ! test_cmp head.old head.new &&
+       test_cmp head.old first-parent &&
+       test_cmp second-parent.expected second-parent &&
+       test_cmp tree.expected tree &&
+       test -f c0.c &&
+       ! test -e c1.c &&
+       test -f c3.c
+'
+
 test_done