Merge branch 'ci/forbid-unwanted-current-branch-update'

* ci/forbid-unwanted-current-branch-update:
  Show interpreted branch name in error messages
  Prevent force-updating of the current branch

1 files changed, 17 insertions, 0 deletions

diff --git a/t/t2018-checkout-branch.sh b/t/t2018-checkout-branch.sh
index a42e03967..75874e85d 100755
--- a/t/t2018-checkout-branch.sh
+++ b/t/t2018-checkout-branch.sh
@@ -118,6 +118,15 @@ test_expect_success 'checkout -b to an existing branch fails' '
 	test_must_fail do_checkout branch2 $HEAD2
 '
 
+test_expect_success 'checkout -b to @{-1} fails with the right branch name' '
+	git reset --hard HEAD &&
+	git checkout branch1 &&
+	git checkout branch2 &&
+	echo  >expect "fatal: A branch named '\''branch1'\'' already exists." &&
+	test_must_fail git checkout -b @{-1} 2>actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'checkout -B to an existing branch resets branch to HEAD' '
 	git checkout branch1 &&
 
@@ -180,4 +189,12 @@ test_expect_success 'checkout -b <describe>' '
 	test_cmp expect actual
 '
 
+test_expect_success 'checkout -B to the current branch fails before merging' '
+	git checkout branch1 &&
+	setup_dirty_mergeable &&
+	git commit -mfooble &&
+	test_must_fail git checkout -B branch1 initial &&
+	test_must_fail test_dirty_mergeable
+'
+
 test_done