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-rw-r--r--numpy/random/tests/test_random.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/numpy/random/tests/test_random.py b/numpy/random/tests/test_random.py
index ef4e7b127..b64c9d6cd 100644
--- a/numpy/random/tests/test_random.py
+++ b/numpy/random/tests/test_random.py
@@ -629,6 +629,12 @@ class TestRandomDist(TestCase):
[ 1.19153771588353052, 1.83509849681825354]])
np.testing.assert_array_almost_equal(actual, desired, decimal=15)
+ def test_vonmises_small(self):
+ # check infinite loop, gh-4720
+ np.random.seed(self.seed)
+ r = np.random.vonmises(mu=0., kappa=1.1e-8, size=10**6)
+ np.testing.assert_(np.isfinite(r).all())
+
def test_wald(self):
np.random.seed(self.seed)
actual = np.random.wald(mean = 1.23, scale = 1.54, size = (3, 2))