Add test domains whitelist & fix tests

Gemfile

@@ -15,8 +15,9 @@ gem 'paper_trail', '~> 10.3'
 gem 'pg',                        '1.2.2'
 # 1.8 is for Rails < 5.0
 gem 'ransack', '~> 2.3'
-gem 'validates_email_format_of', '1.6.3' # validates email against RFC 2822 and RFC 3696
 gem 'truemail', '~> 1.7' # validates email by regexp, mail server existence and address existence
+gem 'validates_email_format_of', '1.6.3' # validates email against RFC 2822 and RFC 3696
+
 
 # 0.7.3 is the latest for Rails 4.2, however, it is absent on Rubygems server
 # https://github.com/huacnlee/rails-settings-cached/issues/165

app/models/nameserver.rb

@@ -88,7 +88,7 @@ class Nameserver < ApplicationRecord
   end
 
   def normalize_attributes
-    self.hostname = hostname.try(:strip).try(:downcase)
+    self.hostname = hostname.try(:strip).try(:downcase).gsub(/\.$/, '')
     self.ipv4 = Array(ipv4).reject(&:blank?).map(&:strip)
     self.ipv6 = Array(ipv6).reject(&:blank?).map(&:strip).map(&:upcase)
   end

config/initializers/truemail.rb

@@ -43,6 +43,11 @@ Truemail.configure do |config|
   # It is equal to empty array by default.
   # config.whitelisted_domains = []
 
+  unless Rails.env.production?
+    config.whitelisted_domains = %w[bestnames.test goodnames.test example.com inbox.test mail.test
+                                    outlook.test invalid.test email.test]
+  end
+
   # Optional parameter. With this option Truemail will validate email which contains whitelisted
   # domain only, i.e. if domain whitelisted, validation will passed to Regex, MX or SMTP validators.
   # Validation of email which not contains whitelisted domain always will return false.