is testing all things a bad thing?

Answer 1

No.

Test everything; retain what is good.
(1 Thessalonians 5:21)

Remember though, it is sometimes hard to decide what God would think is truly good instead of what looks good to us.

Sometimes human beings are not very wise.

With love in Christ.

Answer 2

Testing things in generall is a good thing. However, testing some things (such as the weiners I ate a few moments ago) should onlybe tested once. (I presently do not think you want to test them after I ate them).