Verify partial doubles by default (dependent)

See rspec/rspec-mocks#1409

Author: pirj

spec/rspec/support/recursive_const_methods_spec.rb

@@ -12,6 +12,9 @@ class Parent
 
         class Bar < Parent
           VAL = 10
+          def to_str
+            "Bar"
+          end
         end
       end