rb: Ensure the specs that expect deprecation warnings actually get them [THRIFT-56]

Author: Kevin Ballard <kevin@rapleaf.com>


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@671985 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/spec/deprecation_spec.rb b/lib/rb/spec/deprecation_spec.rb
index 4ca4ee3..77786d8 100644
--- a/lib/rb/spec/deprecation_spec.rb
+++ b/lib/rb/spec/deprecation_spec.rb
@@ -14,6 +14,10 @@
     Thrift.const_set :DEPRECATION, false
   end
 
+  before(:each) do
+    Thrift::DeprecationProxy.reset_deprecation_warnings
+  end
+
   def ensure_const_removed(name, &block)
     begin
       block.call