t5520: use test_config to set/unset git config variables (leftover bits)

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index 80e6be39d7b76d8e5daa6cad24a22a80a42e8eff..f3e0e4a38c3188760df8cb5bd4c096e2209fed9f 100755 (executable)
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -73,8 +73,8 @@ test_expect_success \
 
 test_expect_success \
     'git branch -m dumps usage' \
-       'test_expect_code 129 git branch -m 2>err &&
-       test_i18ngrep "[Uu]sage: git branch" err'
+       'test_expect_code 128 git branch -m 2>err &&
+       test_i18ngrep "too many branches for a rename operation" err'
 
 test_expect_success \
     'git branch -m m m/m should work' \