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Currently there is the unit-tests tag with munit as a synonym.
There are also the tags testing-framework, verificationtest, and testreport, which don't have a usage guidance or tag wiki.
In my opinion there should only be one tag that covers the topics of the Wolfram Language Guide Systematic Testing & Verification and the Using the Testing Framework Wolfram Language Tutorial.
The tags unit-tests, munit, testing-framework, verificationtest, and testreport should all become synonyms for the new tag testing-and-verification.
The tags testing-framework, verificationtest, and testreport should become synonymous to unit-tests.