testing
US /ˈtes.tɪŋ/
UK /ˈtes.tɪŋ/

1.
the process of subjecting something to a test or trial
:
•
The new software is currently undergoing rigorous testing.
•
Blood testing is a common diagnostic tool.
1.
present participle of test
:
•
They are testing the new engine for performance.
•
The doctor is testing her reflexes.