How to share subfunctions please help me

How to share sub-functions, please help me-Linux general technology-Linux programming and kernel information, the following is a detailed reading. The program in hello. sh is
#! /Bin/bash
Function test1
{
If [$1-eq "666666"]
Then
Ehco "hello, everyone! "
Else
Echo "wrong number ."
Fi
}
Export test1
Test2
The program in test2.sh is
#! /Bin/bash
Test1 666666
After execution, the first program prompts test2: command not found.
The second program prompts test1: command not found.

How can we make the second program share the functions in the first program? Thank you for your help!