extract method #max_login_attempts

Respects Law of Demeter, useful for stubbing out methods on instance or
for apps that use the NullObject pattern for guest user accounts.

lib/two_factor_authentication/models/two_factor_authenticatable.rb

@@ -57,7 +57,11 @@ module Devise
         end
 
         def max_login_attempts?
-          second_factor_attempts_count >= self.class.max_login_attempts
+          second_factor_attempts_count.to_i >= max_login_attempts.to_i
+        end
+
+        def max_login_attempts
+          self.class.max_login_attempts
         end
 
       end

spec/lib/two_factor_authentication/models/two_factor_authenticatable_spec.rb

@@ -98,3 +98,36 @@ describe Devise::Models::TwoFactorAuthenticatable, '#provisioning_uri' do
   end
 
 end
+
+describe Devise::Models::TwoFactorAuthenticatable, '#max_login_attempts' do
+  let(:instance) { AuthenticatedModelHelper.create_new_user }
+
+  before do
+    @original_max_login_attempts = User.max_login_attempts
+    User.max_login_attempts = 3
+  end
+
+  after { User.max_login_attempts = @original_max_login_attempts }
+
+  it "returns class setting" do
+    expect(instance.max_login_attempts).to eq(3)
+  end
+
+  it "returns false as boolean" do
+    instance.second_factor_attempts_count = nil
+    expect(instance.max_login_attempts?).to be_false
+    instance.second_factor_attempts_count = 0
+    expect(instance.max_login_attempts?).to be_false
+    instance.second_factor_attempts_count = 1
+    expect(instance.max_login_attempts?).to be_false
+    instance.second_factor_attempts_count = 2
+    expect(instance.max_login_attempts?).to be_false
+  end
+
+  it "returns true as boolean after too many attempts" do
+    instance.second_factor_attempts_count = 3
+    expect(instance.max_login_attempts?).to be_true
+    instance.second_factor_attempts_count = 4
+    expect(instance.max_login_attempts?).to be_true
+  end
+end

spec/spec_helper.rb

@@ -3,10 +3,8 @@ require "bundler/setup"
 
 require 'two_factor_authentication'
 
-
 Dir["#{Dir.pwd}/spec/support/**/*.rb"].each {|f| require f}
 
-
 # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 RSpec.configure do |config|
   config.treat_symbols_as_metadata_keys_with_true_values = true

spec/support/authenticated_model_helper.rb

@@ -6,7 +6,7 @@ module AuthenticatedModelHelper
     include Devise::Models::TwoFactorAuthenticatable
 
     define_model_callbacks :create
-    attr_accessor :otp_secret_key, :email
+    attr_accessor :otp_secret_key, :email, :second_factor_attempts_count
 
     has_one_time_password
   end