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*It is only as precise as the specification and specifications are typically imprecise.
*It compares poorly with other techniques to find bugs (f.ex. [[static program analysis]]).
*If different inputs are randomly selected on each test run, this can create problems for [[continuous integration]] because the same tests will pass or fail randomly.<ref name="so">{{cite web|url=httphttps://stackoverflow.com/questionsq/636353/is-it-a-bad-practice-to-randomly-generate-test-data |title=Is it a bad practice to randomly-generate test data?|website=stackoverflow.com|accessdate=15 November 2017}}</ref>
*Some argue that it would be better to thoughtfully cover all relevant cases with manually constructed tests in a white-box fashion, than to rely on randomness.<ref name="so" />