test_must_fail git -c "" rev-parse
'
+test_expect_success 'multiple git -c appends config' '
+ test_config alias.x "!git -c x.two=2 config --get-regexp ^x\.*" &&
+ cat >expect <<-\EOF &&
+ x.one 1
+ x.two 2
+ EOF
+ git -c x.one=1 x >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git -c is not confused by empty environment' '
+ GIT_CONFIG_PARAMETERS="" git -c x.one=1 config --list
+'
+
test_expect_success 'git config --edit works' '
git config -f tmp test.value no &&
echo test.value=yes >expect &&