+rm -f B
+
+test_expect_success 'dump usage when upstream arg is missing' '
+ git checkout -b usage topic &&
+ test_must_fail git rebase 2>error1 &&
+ grep "[Uu]sage" error1 &&
+ test_must_fail git rebase --abort 2>error2 &&
+ grep "No rebase in progress" error2 &&
+ test_must_fail git rebase --onto master 2>error3 &&
+ grep "[Uu]sage" error3 &&
+ ! grep "can.t shift" error3
+'