def test_non_empty_list_of(self):
s = Gen.non_empty_list_of(Gen.constant(1))
ss = Gen.sample(1, 10, s)
lens = set()
for v in ss:
lens.add(len(v))
for i in v:
self.assertEqual(1, i)
self.assertTrue(0 < len(lens) < 4)
for l in lens:
self.assertTrue(l in {1, 2})
self.assertNotEqual(0, l)
