The cronjob runs from home directory by default. So you should see the file to be created under /home/ec2-user or /root if you run it by root account.
If you need generate the new file with the nominate path, one way is to use absolute path as @yftse said. The other way is
* * * * * cd /home/ec2-user/Test/; bash /home/ec2-user/Test/test_thing.sh
