diff --git a/spec/models/rate_spec.rb b/spec/models/rate_spec.rb
index 35a1917..11accf4 100644
--- a/spec/models/rate_spec.rb
+++ b/spec/models/rate_spec.rb
@@ -168,6 +168,11 @@ describe Rate, 'for' do
       Rate.should_receive(:for_user_project_and_date).with(@user, @project, @date).and_return(@rate)
       Rate.for(@user, @project, @date).should eql(@rate.amount)
     end
+    
+    it 'should return nil if no rate is found' do
+      Rate.should_receive(:for_user_project_and_date).with(@user, @project, @date).and_return(nil)
+      Rate.for(@user, @project, @date).should be_nil
+    end
   end
 
   describe 'with a user and project' do
@@ -180,6 +185,11 @@ describe Rate, 'for' do
       Rate.should_receive(:for_user_project_and_date).with(@user, @project, Date.today.to_s).and_return(@rate)
       Rate.for(@user, @project).should eql(@rate.amount)
     end
+
+    it 'should return nil if no rate is found' do
+      Rate.should_receive(:for_user_project_and_date).with(@user, @project, Date.today.to_s).and_return(nil)
+      Rate.for(@user, @project).should be_nil
+    end
   end
 
   describe 'with a user' do
@@ -192,6 +202,11 @@ describe Rate, 'for' do
       Rate.should_receive(:for_user_project_and_date).with(@user, nil, Date.today.to_s).and_return(@rate)
       Rate.for(@user).should eql(@rate.amount)
     end
+
+    it 'should return nil if no rate is found' do
+      Rate.should_receive(:for_user_project_and_date).with(@user, nil, Date.today.to_s).and_return(nil)
+      Rate.for(@user).should be_nil
+    end
   end
   
   it 'with an invalid user should raise an InvalidParameterException' do