Generate n dummy files in testdir.

gen.sh

#!/usr/bin/env bash

if [ $# -lt 1 ]; then
  echo "usage: $0 <nr_test_files>"
  exit 0
fi

rm -rf testdir
mkdir -p testdir

for i in $(eval echo {1..$1}); do
  touch "testdir/testfile.$i"
done

echo "Generated $1 test files in testdir."