Remove XFAIL mark on passing tests

Author: michaelosthege

pymc/tests/test_distributions_random.py

@@ -1853,9 +1853,6 @@ def test_density_dist_with_random(self, size):
 
         assert obs.eval().shape == (100,) + size
 
-    @pytest.mark.xfail(
-        reason="Needs refactoring of _check_start_shape to not attempt random draws. See #5031."
-    )
     def test_density_dist_without_random(self):
         with pm.Model() as model:
             mu = pm.Normal("mu", 0, 1)

pymc/tests/test_sampling.py

@@ -314,7 +314,6 @@ def test_exceptions(self):
                 xvars = [t["mu"] for t in trace]
 
 
-@pytest.mark.xfail(reason="Lognormal not refactored for v4")
 def test_sample_find_MAP_does_not_modify_start():
     # see https://github.com/pymc-devs/pymc/pull/4458
     with pm.Model():