Fix sampler test failure

test/sampler_test.py

@@ -703,8 +703,8 @@ class TestPyMC3(unittest.TestCase):
             discard_tuned_samples=True,
             compute_convergence_checks=True,
         )
-        expected.update(bilby.core.sampler.Pymc3.default_nuts_kwargs)
-        expected.update(bilby.core.sampler.Pymc3.default_step_kwargs)
+        expected.update(self.sampler.default_nuts_kwargs)
+        expected.update(self.sampler.default_step_kwargs)
         self.assertDictEqual(expected, self.sampler.kwargs)
 
     def test_translate_kwargs(self):
@@ -727,8 +727,8 @@ class TestPyMC3(unittest.TestCase):
             discard_tuned_samples=True,
             compute_convergence_checks=True,
         )
-        expected.update(bilby.core.sampler.Pymc3.default_nuts_kwargs)
-        expected.update(bilby.core.sampler.Pymc3.default_step_kwargs)
+        expected.update(self.sampler.default_nuts_kwargs)
+        expected.update(self.sampler.default_step_kwargs)
         self.sampler.kwargs["draws"] = 123
         for equiv in bilby.core.sampler.base_sampler.NestedSampler.npoints_equiv_kwargs:
             new_kwargs = self.sampler.kwargs.copy()