t0021: use write_script to create rot13 shell script

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index a20b9f58e3fe1de2932046d5d7f692b45e3ac854..dfde2254918be3aab5aa701248f6fe8cae2e5f14 100755 (executable)
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -6,13 +6,11 @@ test_description='blob conversion via gitattributes'
 
 TEST_ROOT="$(pwd)"
 
-cat <<EOF >"$TEST_ROOT/rot13.sh"
-#!$SHELL_PATH
+write_script <<\EOF "$TEST_ROOT/rot13.sh"
 tr \
   'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' \
   'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
 EOF
-chmod +x "$TEST_ROOT/rot13.sh"
 
 generate_random_characters () {
        LEN=$1