#!/bin/bash
bash solution.sh > /dev/null 2>&1

if [ -f hello.txt ]; then
  echo "ok 1 - hello.txt is created"
else
  echo "not ok 1 - hello.txt is created"
fi

ACTUAL=$(cat hello.txt 2>/dev/null)
ACTUAL="${ACTUAL%$'\n'}"
if [ "$ACTUAL" = "Hello, World" ]; then
  echo "ok 2 - hello.txt contains 'Hello, World'"
else
  echo "not ok 2 - hello.txt contains 'Hello, World'"
fi