Adds method to convert device type to integer

Author: coding-chimp

lib/onesignal.rb

@@ -16,4 +16,8 @@ module OneSignal
   DEVICE_TYPES = %w(
     ios android amazon mpns chrome_app chrome_website wns safari firefox
   ).freeze
+
+  def self.device_type_as_integer(device_type)
+    DEVICE_TYPES.index(device_type)
+  end
 end

test/onesignal_test.rb

@@ -0,0 +1,7 @@
+require_relative 'test_helper'
+
+class OneSignalTest < Minitest::Test
+  def test_device_type_as_integer
+    assert_equal 0, OneSignal.device_type_as_integer('ios')
+  end
+end