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"test group" is correct and usable in written English.
You can use it to refer to a group of people or objects that have been selected to receive a particular treatment, or to test something. For example, "The test group was given the new medication in order to assess its effectiveness."
Exact(58)
testgroupacct: Another test group account.
The test group included 410 Little League pitchers.
Pressures varied greatly within each test group.
The subjects were then randomized into reference or test group.
So that's the baseline test group for the study.
Developed solutions were verified on a test group of users.
"I guess we're the test group," one passenger joked to another as they walked aboard.
The feature has been in development for six months with a small test group.
Tonium invited a test group to try out Pacemaker software on their Macs and PCs.
Similar(2)
test group-1.
The post-test group scored lower on both variables.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com