sampler_test.py: update PyMultiNest defaults

test/sampler_test.py

@@ -481,7 +481,7 @@ class TestPymultinest(unittest.TestCase):
         expected = dict(importance_nested_sampling=False, resume=True,
                         verbose=True, sampling_efficiency='parameter',
                         outputfiles_basename='outdir/pm_label/',
-                        n_live_points=500, n_params=None,
+                        n_live_points=500, n_params=2,
                         n_clustering_params=None, wrapped_params=None,
                         multimodal=True, const_efficiency_mode=False,
                         evidence_tolerance=0.5,
@@ -497,7 +497,7 @@ class TestPymultinest(unittest.TestCase):
         expected = dict(importance_nested_sampling=False, resume=True,
                         verbose=True, sampling_efficiency='parameter',
                         outputfiles_basename='outdir/pm_label/',
-                        n_live_points=123, n_params=None,
+                        n_live_points=123, n_params=2,
                         n_clustering_params=None, wrapped_params=None,
                         multimodal=True, const_efficiency_mode=False,
                         evidence_tolerance=0.5,