No fixed tests. Copy the example tests to the submit tests. There should be absolutely no possibility of failing the example tests but passing the random tests.

No test with k = 1. That means testing the specs is incomplete; k = 1 is legal according to the specs.

There are no random tests. The describe block says the tests are random, but they're all fixed.

the function should return dates that fall on the specified daysOfWeek and also fall on the nthWeek of every month within the range from dateFrom to dateTo.

There are no universal definitions on how to count "n-th week of a month", unlike "n-th week of a year", which is well-defined in ISO standard. So you need to clarify what definition you're using.

You should mention if dateTo is inclusive or not.