2250: test Feb 11, 2021
While there are a number of words surprisingly related to 'testify' or 'testimony', 'test' is not one of them. This word actually for much of history both in English and the original Latin referred to a potsherd, or another small piece of pottery. The sense which it currently holds of an examination is relatively modern, deriving from the notion of checking molten metal in a mold, which eventually superseded the original sense of the word.
2247: testis & testifying Feb 8, 2021
There are a lot of etymologies related to genitalia, such as 'avocado', the word 'testis' (of which 'testicle is merely a diminutive) has perhaps a surprising origin. Ultimately it comes from a Latin word meaning 'witness', related to 'testimony; testament' and ultimately the word 'three' from *tréyes (three) as in a third party observer. The witness in this case is as a proof of one's virility. Lest this be considered an isolated example in history, consider also the translation of the Greek synonym derives from a word meaning 'one who is present'.