feature: add get source for xcuitest

ios_tests/lib/ios/specs/ios/command/source.rb

@@ -0,0 +1,7 @@
+# rake ios[ios/command/source]
+describe 'ios/command/source' do
+  t 'source' do
+    xcuitest_source(format: :json).is_a?(Hash).must_equal true
+    xcuitest_source(format: :xml).is_a?(String).must_equal true
+  end
+end

lib/appium_lib/ios/xcuitest/bridge.rb

@@ -9,6 +9,7 @@ def self.for(target)
           target.extend Appium::Ios::Device
           target.extend Appium::Ios::Xcuitest
           target.extend Appium::Ios::Xcuitest::Command
+          target.extend Appium::Ios::Xcuitest::Source
           target.extend Appium::Ios::Xcuitest::Helper
           target.extend Appium::Ios::Xcuitest::Gesture
           target.extend Appium::Ios::Xcuitest::Element

lib/appium_lib/ios/xcuitest/command.rb

@@ -1,5 +1,6 @@
 require_relative 'command/pasteboard'
 require_relative 'command/gestures'
+require_relative 'command/source'
 
 module Appium
   module Ios

lib/appium_lib/ios/xcuitest/command/source.rb

@@ -0,0 +1,20 @@
+module Appium
+  module Ios
+    module Xcuitest
+      module Source
+        # @param [String|Symbol] format :xml or :json. :xml is by default.
+        # @option opts [Element] :element Element to swipe on
+        #
+        #   ```ruby
+        #   xcuitest_source format: :json
+        #   ```
+        def xcuitest_source(format: :xml)
+          format = format.to_s if format.is_a? Symbol
+          args = { format: format }
+
+          @driver.execute_script 'mobile: source', args
+        end
+      end # module Gesture
+    end # module Xcuitest
+  end # module Ios
+end # module Appium