Yes, testiest is in the scrabble dictionary

...and is worth 8 points by itself.

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Testiest Definition

adjective

Superlative form of testy.

from the English-language Wiktionary

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Here are some other words you could make with the letters TESTIEST, you can also
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Top Words by points	Points
testiest	8

2 letter words with TESTIEST	Points
et	2
es	2
te	2
ti	2
is	2
it	2
si	2

3 letter words with TESTIEST	Points
sei	3
tee	3
tes	3
tet	3
sit	3
sis	3
set	3
see	3
its	3
tie	3
tis	3
tit	3
est	3
ess	3

4 letter words with TESTIEST	Points
tees	4
test	4
tets	4
ties	4
tits	4
stet	4
sits	4
site	4
sett	4
sets	4
seis	4
sees	4
ests	4
esse	4
eses	4

5 letter words with TESTIEST	Points
tests	5
seise	5
sties	5
stets	5
sites	5
setts	5

6 letter words with TESTIEST	Points
sestet	6
testes	6
testis	6
tsetse	6

8 letter words with TESTIEST	Points
testiest	8

Found 47 words in 0.29247 seconds