Add the testcase according to the review comment
@@ -62,6 +62,7 @@ class TestCov(unittest.TestCase):
self.check((2, 3), bias=True)
self.check((2, 3), ddof=2)
with testing.assert_warns(RuntimeWarning):
+ self.check((2, 3), ddof=3)
self.check((2, 3), ddof=4)
def test_cov_raises(self):
