Answer:
We will begin testing in a few moments; however, you must have your test ticket to begin.
Step-by-step explanation:
This is the answer because:
1) One of the semicolon rules is: Use a semicolon between independent clauses which are linked in meaning with a transitional word. For example, however, therefore, in conclusion, etc.
2) Therefore, we put a semicolon before however.
Hope this helps!