diff --git a/optout/src/test/resources/check-conf-file.sh b/optout/src/test/resources/check-conf-file.sh
index cad605d..e79c1c3 100644
--- a/optout/src/test/resources/check-conf-file.sh
+++ b/optout/src/test/resources/check-conf-file.sh
@@ -4,15 +4,17 @@ set -e
 
 # Echo to stderr
 err() {
-  echo 2>&1 $1
+  echo 2>&1 "$@"
 }
 
 conf_file=$1
 today=$(date +%Y%m%d)
 expected=$(mktemp)
 
+err "Expected file content:"
+
 # Use head from gnu coreutils to remove trailing newline
-head -c-1 <<EOF > "$expected"
+head -c-1 <<EOF | tee 2>&1 "$expected"
 HDR_BENECONFIRM${today}
 1S00E00JG37${today}NAccepted  00
 7SP1D00AA00${today}NAccepted  00
@@ -24,6 +26,16 @@ DUMMY000007${today}NAccepted  00
 TRL_BENECONFIRM${today}0000000007
 EOF
 
-err "Testing confirmation file"
-diff -u "$conf_file" "$expected"
-err "Confirmation file is formatted as expected"
+# Print some newlines to make logs easier to read
+err
+err
+
+err "Testing confirmation file..."
+
+# Hide output for now to avoid revealing sensitive info
+if ! diff -u "$conf_file" "$expected" > /dev/null; then
+  err "Confirmation file differs from expected"
+  exit 1
+fi
+
+err "Confirmation file matches expected"