How to take parameters to run a script from a text file?

Question

linux

Let's say I have a simple test.st script that displays everything that is given to it in the first parameter
#!/bin/bash
echo $1
There is a test.txt file in which "123" is written.
I execute ./test.sh 123 I get 123 I
execute cat test.txt | ./test.sh get nothing.
My script is not formatted correctly, or do I need to redirect in the wrong way?

Answer 1

./test.sh $(cat test.txt)

Answer 2

cat test.txt | xargs ./test.sh