difftool: print list of valid tools with '--tool-help'

diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index e26e14dd535d13ca1da1590461b07c0953d8dcd6..7788ae02adca18ab1d1f8cf7b76243fbf56377ae 100755 (executable)
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -160,20 +160,18 @@ rm -f B
 
 test_expect_success 'fail when upstream arg is missing and not on branch' '
        git checkout topic &&
-       test_must_fail git rebase >output.out &&
-       grep "You are not currently on a branch" output.out
+       test_must_fail git rebase
 '
 
 test_expect_success 'fail when upstream arg is missing and not configured' '
        git checkout -b no-config topic &&
-       test_must_fail git rebase >output.out &&
-       grep "branch.no-config.merge" output.out
+       test_must_fail git rebase
 '
 
 test_expect_success 'default to @{upstream} when upstream arg is missing' '
        git checkout -b default topic &&
-       git config branch.default.remote .
-       git config branch.default.merge refs/heads/master
+       git config branch.default.remote . &&
+       git config branch.default.merge refs/heads/master &&
        git rebase &&
        test "$(git rev-parse default~1)" = "$(git rev-parse master)"
 '