1 files changed, 12 insertions, 1 deletions
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index b7a670ef40..be7ae5a004 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -14,7 +14,8 @@ export GIT_AUTHOR_EMAIL
 
 test_expect_success \
     'prepare repository with topic branches' \
-    'echo First > A &&
+    'git config core.logAllRefUpdates true &&
+     echo First > A &&
      git update-index --add A &&
      git commit -m "Add A." &&
      git checkout -b my-topic-branch &&
@@ -47,6 +48,10 @@ test_expect_success \
     'the rebase operation should not have destroyed author information' \
     '! (git log | grep "Author:" | grep "<>")'
 
+test_expect_success 'HEAD was detached during rebase' '
+     test $(git rev-parse HEAD@{1}) != $(git rev-parse my-topic-branch@{1})
+'
+
 test_expect_success 'rebase after merge master' '
      git reset --hard topic &&
      git merge master &&
@@ -84,4 +89,10 @@ test_expect_success 'rebase a single mode change' '
      GIT_TRACE=1 git rebase master
 '
 
+test_expect_success 'Show verbose error when HEAD could not be detached' '
+     : > B &&
+     test_must_fail git rebase topic 2> output.err > output.out &&
+     grep "Untracked working tree file .B. would be overwritten" output.err
+'
+
 test_done