t: prefer "git config --file" to GIT_CONFIG with test_must_fail

diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh
index 967359344dab8118dfd55816ef08f4809a9f33ad..e355aa1c97f48b2256d1b05b8c539a0b78199f02 100755 (executable)
--- a/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@ -961,24 +961,15 @@ test_expect_success SYMLINKS 'symlinked configuration' '
 '
 
 test_expect_success 'nonexistent configuration' '
-       (
-               GIT_CONFIG=doesnotexist &&
-               export GIT_CONFIG &&
-               test_must_fail git config --list &&
-               test_must_fail git config test.xyzzy
-       )
+       test_must_fail git config --file=doesnotexist --list &&
+       test_must_fail git config --file=doesnotexist test.xyzzy
 '
 
 test_expect_success SYMLINKS 'symlink to nonexistent configuration' '
        ln -s doesnotexist linktonada &&
        ln -s linktonada linktolinktonada &&
-       (
-               GIT_CONFIG=linktonada &&
-               export GIT_CONFIG &&
-               test_must_fail git config --list &&
-               GIT_CONFIG=linktolinktonada &&
-               test_must_fail git config --list
-       )
+       test_must_fail git config --file=linktonada --list &&
+       test_must_fail git config --file=linktolinktonada --list
 '
 
 test_expect_success 'check split_cmdline return' "