t2106: make test independent of the current main branch name

We do have this wonderful shortcut `git checkout -` to go back to the
previous branch, thanks to the reflog.

Signed-off-by: Johannes Schindelin <redacted>
Signed-off-by: Junio C Hamano <redacted>

diff --git a/t/t2106-update-index-assume-unchanged.sh b/t/t2106-update-index-assume-unchanged.sh
index ff0947f38813123b8388360228cb6530d7a0b645..3396f2336362337ed104b75af71a4dc7aa3d4b2a 100755 (executable)
--- a/t/t2106-update-index-assume-unchanged.sh
+++ b/t/t2106-update-index-assume-unchanged.sh
@@ -20,7 +20,7 @@ test_expect_success 'do not switch branches with dirty file' '
        git checkout other &&
        echo dirt >file &&
        git update-index --assume-unchanged file &&
-       test_must_fail git checkout master
+       test_must_fail git checkout -
 '
 
 test_done