cat <<'EOF' > expected
EOF
test_diff <<'EOF'
// TODO: check if the token is at the beginning of line.
// TODO: check if skipped whitespaces do not contain line breaks.
int main() {
    return 0;
}
EOF

cat <<'EOF' > expected
EOF

test_diff <<'EOF'
/* lorem ipsum */
/*
lorem ipsum
*/
// /*
/* /*
 */
int/**/main() {
}
EOF