Added prior maximum increase test to GW prior tests

test/gw_prior_test.py

@@ -458,6 +458,15 @@ class TestUniformComovingVolumePrior(unittest.TestCase):
         )
         self.assertEqual(prior.maximum, 10000)
 
+    def test_increase_maximum(self):
+        prior = bilby.gw.prior.UniformComovingVolume(
+            minimum=10, maximum=10000, name="luminosity_distance"
+        )
+        prior.maximum = 20000
+        np.random.seed(1234)
+        prior_sample = prior.sample(1000)
+        self.assertEqual(int(plt.hist(prior_sample)[0][9]), 138)
+
     def test_zero_minimum_works(self):
         prior = bilby.gw.prior.UniformComovingVolume(
             minimum=0, maximum=10000, name="luminosity_distance"