diff --git a/Gemfile.lock b/Gemfile.lock
index fba38c9..8c8abc9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    paypal-recurring (0.1.6)
+    paypal-recurring (0.1.7)
 
 GEM
   remote: http://rubygems.org/
diff --git a/spec/paypal/request_spec.rb b/spec/paypal/request_spec.rb
index 9c6ed82..5f859d1 100644
--- a/spec/paypal/request_spec.rb
+++ b/spec/paypal/request_spec.rb
@@ -83,6 +83,12 @@
       subject.normalize_params(:period => :yearly).should == {:BILLINGPERIOD => "Year"}
     end
 
+    it "normalizes trial period" do
+      subject.normalize_params(:trial_period => :monthly).should == {:TRIALBILLINGPERIOD => "Month"}
+      subject.normalize_params(:trial_period => :daily).should == {:TRIALBILLINGPERIOD => "Day"}
+      subject.normalize_params(:trial_period => :yearly).should == {:TRIALBILLINGPERIOD => "Year"}
+    end
+    
     it "normalizes start at" do
       date = Time.parse("2011-06-26 15:13:00")
       subject.normalize_params(:start_at => date).should == {:PROFILESTARTDATE => "2011-06-26T15:13:00Z"}