test_expect_success setup '
 
-       cat ../test4012.png >m &&
+       cat "$TEST_DIRECTORY"/test4012.png >m &&
        git add m &&
        git ls-files -s | sed -e "s/ 0  / 1     /" >E1 &&
        test_tick &&
                false
        else
                git ls-files -s >current
-               diff -u current expect
+               test_cmp current expect
        fi
 '
 
                false
        else
                git ls-files -s >current
-               diff -u current expect
+               test_cmp current expect
        fi
 '