inserted an idea for testing in test_distributions_random.py

Author: gilliss

pymc3/tests/test_distributions_random.py

@@ -138,13 +138,26 @@ def get_random_variable(self, shape, with_vector_params=False, name=None):
                 else:
                     return self.distribution(name, shape=shape, transform=None, **params)
 
+        def get_random_variable_default_params(self, shape, name=None):
+            if name is None:
+                name = self.distribution.__name__
+            with self.model:
+                if shape is None:
+                    return self.distribution(name, transform=None)
+                else:
+                    return self.distribution(name, shape=shape, transform=None)
+
         @staticmethod
         def sample_random_variable(random_variable, size):
             try:
                 return random_variable.random(size=size)
             except AttributeError:
                 return random_variable.distribution.random(size=size)
 
+        def test_sample_random_variable_default_params(self, size):
+            rv = self.get_random_variable_default_params(None)
+            self.sample_random_variable(rv, size)
+
         @pytest.mark.parametrize('size', [None, 5, (4, 5)], ids=str)
         def test_scalar_parameter_shape(self, size):
             rv = self.get_random_variable(None)