Introduce usagef() that takes a printf-style format

diff --git a/t/t3101-ls-tree-dirname.sh b/t/t3101-ls-tree-dirname.sh
index 70f9ce9d52827cb35fee7ac0f13471023291d1fa..51cb4a30f571772399697bc073153b7e956853bf 100755 (executable)
--- a/t/t3101-ls-tree-dirname.sh
+++ b/t/t3101-ls-tree-dirname.sh
@@ -43,7 +43,7 @@ _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 test_output () {
     sed -e "s/ $_x40   / X     /" <current >check
-    git diff expected check
+    test_cmp expected check
 }
 
 test_expect_success \
@@ -135,4 +135,10 @@ test_expect_success \
 EOF
      test_output'
 
+test_expect_success 'ls-tree filter is leading path match' '
+       git ls-tree $tree pa path3/a >current &&
+       >expected &&
+       test_output
+'
+
 test_done