Fix values in test_ignores_observed

Author: ricardoV94

pymc3/tests/test_sampling.py

@@ -834,9 +834,9 @@ def test_ignores_observed(self):
             prior = pm.sample_prior_predictive()
 
         assert "observed_data" not in prior
-        assert (prior["mu"] < 90).all()
+        assert (prior["mu"] < -90).all()
         assert (prior["positive_mu"] > 90).all()
-        assert (prior["x_obs"] < 90).all()
+        assert (prior["x_obs"] < -90).all()
         assert prior["x_obs"].shape == (500, 200)
         npt.assert_array_almost_equal(prior["positive_mu"], np.abs(prior["mu"]), decimal=4)