Fix in find_for_authentication

app/models/user.rb

@@ -76,6 +76,7 @@ class User
   end
 
   def self.find_for_authentication(conditions={})
+    conditions[:username] = conditions[:username].downcase
     if conditions[:username] =~ /^([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,})$/i # email regex
       conditions[:email] = conditions.delete(:username)
     end

spec/models/user_spec.rb

@@ -242,9 +242,15 @@ describe User do
   end
 
   describe ".find_for_authentication" do
-    it "preserves case" do
+    before do
+      user
+      user2
+    end
+    it 'finds a user' do
       User.find_for_authentication(:username => user.username).should == user
-      User.find_for_authentication(:username => user.username.upcase).should be_nil
+    end
+    it "does not preserve case" do
+      User.find_for_authentication(:username => user.username.upcase).should == user
     end
   end