Merge branch 'jn/branch-move-to-self' into maint

* jn/branch-move-to-self:
  Allow checkout -B <current-branch> to update the current branch
  branch: allow a no-op "branch -M <current-branch> HEAD"

2 files changed, 21 insertions, 4 deletions

diff --git a/t/t2018-checkout-branch.sh b/t/t2018-checkout-branch.sh
index 75874e8..2741262 100755
--- a/t/t2018-checkout-branch.sh
+++ b/t/t2018-checkout-branch.sh
@@ -189,12 +189,13 @@ test_expect_success 'checkout -b <describe>' '
 	test_cmp expect actual
 '
 
-test_expect_success 'checkout -B to the current branch fails before merging' '
+test_expect_success 'checkout -B to the current branch works' '
 	git checkout branch1 &&
+	git checkout -B branch1-scratch &&
+
 	setup_dirty_mergeable &&
-	git commit -mfooble &&
-	test_must_fail git checkout -B branch1 initial &&
-	test_must_fail test_dirty_mergeable
+	git checkout -B branch1-scratch initial &&
+	test_dirty_mergeable
 '
 
 test_done
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index bc73c20..7690332 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -115,6 +115,22 @@ test_expect_success 'git branch -M baz bam should succeed when baz is checked ou
 	git branch -M baz bam
 '
 
+test_expect_success 'git branch -M master should work when master is checked out' '
+	git checkout master &&
+	git branch -M master
+'
+
+test_expect_success 'git branch -M master master should work when master is checked out' '
+	git checkout master &&
+	git branch -M master master
+'
+
+test_expect_success 'git branch -M master2 master2 should work when master is checked out' '
+	git checkout master &&
+	git branch master2 &&
+	git branch -M master2 master2
+'
+
 test_expect_success 'git branch -v -d t should work' '
 	git branch t &&
 	test_path_is_file .git/refs/heads/t &&