Do not use this gem in test version and fixed the build

Author: Neeraj Singh

README.md

@@ -28,9 +28,14 @@ options = { forward_emails_to: 'intercepted_emails@domain.com',
             subject_prefix: 'WHEEL' }
 
 interceptor = MailInterceptor::Interceptor.new(options)
-ActionMailer::Base.register_interceptor(interceptor)
+unless Rails.env.test?
+  ActionMailer::Base.register_interceptor(interceptor)
+end
 ```
 
+Do not use this feature in test mode so that in your tests
+you can test against real recipients of the email.
+
 ### deliver_emails_to
 
 Passing __deliver_emails_to__ is optional. If no "deliver_emails_to"

lib/mail_interceptor.rb

@@ -39,7 +39,6 @@ def normalize_recipients recipients
 
     def add_subject_prefix message
       return if subject_prefix.blank?
-      return if !env.intercept?
 
       message.subject = "#{subject_prefix} #{message.subject}"
     end
@@ -70,8 +69,6 @@ def name
     end
 
     def intercept?
-      return false if Rails.env.test?
-
       !Rails.env.production?
     end
   end