apply transform to a distribution's test value (pymc-devs#1358)

Author: Spaak

pymc3/model.py

@@ -694,7 +694,8 @@ def __init__(self, type=None, owner=None, index=None, name=None,
 
             theano.Apply(theano.compile.view_op, inputs=[
                          normalRV], outputs=[self])
-            self.tag.test_value = normalRV.tag.test_value
+            self.tag.test_value = transform.forward(
+                normalRV.tag.test_value).eval()
 
             incorporate_methods(source=distribution, destination=self,
                                 methods=['random'],