refs: manage current_ref within do_one_ref()

diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index bc46563afc607e6fba9acbd2773d88207c878981..2d9f9a0cf1555cab24af19f264d495e134c27352 100755 (executable)
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -12,7 +12,7 @@ test_expect_success 'prepare repository' \
        'echo AIT >a && echo BIT >b && echo CIT >c && echo DIT >d &&
         git update-index --add a b c d &&
         echo git >a &&
-        cat "$TEST_DIRECTORY"/test4012.png >b &&
+        cat "$TEST_DIRECTORY"/test-binary-1.png >b &&
         echo git >c &&
         cat b b >d'
 
@@ -77,10 +77,6 @@ test_expect_success 'apply binary patch' \
         tree1=`git write-tree` &&
         test "$tree1" = "$tree0"'
 
-nul_to_q() {
-       perl -pe 'y/\000/Q/'
-}
-
 test_expect_success 'diff --no-index with binary creation' '
        echo Q | q_to_nul >binary &&
        (: hide error code from diff, which just indicates differences