refs: document how current_ref is used

diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index febc45c9cc6f34a606ebac8470e582efad798148..1035a14b37203202a5476f65d07f9bc505bfb52c 100755 (executable)
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -196,6 +196,17 @@ test_expect_success 'root subdir attribute test' '
        attr_check subdir/a/i unspecified
 '
 
+test_expect_success 'negative patterns' '
+       echo "!f test=bar" >.gitattributes &&
+       git check-attr test -- '"'"'!f'"'"' 2>errors &&
+       test_i18ngrep "Negative patterns are ignored" errors
+'
+
+test_expect_success 'patterns starting with exclamation' '
+       echo "\!f test=foo" >.gitattributes &&
+       attr_check "!f" foo
+'
+
 test_expect_success 'setup bare' '
        git clone --bare . bare.git &&
        cd bare.git