Resolve "Follow-up from "Adding dnest4 Sampler""

Requires !888 (merged) Closes #533 (closed)

test/core/sampler/dnest4_test.py

@@ -31,8 +31,7 @@ class TestDnest4(unittest.TestCase):
             max_num_levels=20, num_steps=500,
             new_level_interval=10000, num_per_step=10000,
             thread_steps=1, num_particles=1000, lam=10.0,
-            beta=100, seed=None, verbose=True, outputfiles_basename=None,
-            backend='memory'
+            beta=100, seed=None, verbose=True, backend='memory'
         )
         for key in self.sampler.kwargs.keys():
             print(
@@ -47,8 +46,7 @@ class TestDnest4(unittest.TestCase):
             max_num_levels=20, num_steps=500,
             new_level_interval=10000, num_per_step=10000,
             thread_steps=1, num_particles=1000, lam=10.0,
-            beta=100, seed=None, verbose=True, outputfiles_basename=None,
-            backend='memory'
+            beta=100, seed=None, verbose=True, backend='memory'
         )
 
         for equiv in bilby.core.sampler.base_sampler.NestedSampler.npoints_equiv_kwargs: