user_test.rb

    should "select the exact matching user first" do
      case_sensitive_user = User.generate_with_protected!(:login => 'changed', :password => 'admin', :password_confirmation => 'admin')
      # bypass validations to make it appear like existing data
      case_sensitive_user.update_attribute(:login, 'ADMIN')

      user = User.try_to_login("ADMIN", "admin")
      assert_kind_of User, user
      assert_equal "ADMIN", user.login

    end