Get rif of warnings

Author: route

lib/ferrum/browser/process.rb

@@ -64,7 +64,7 @@ def initialize(options)
           return
         end
 
-        @xvfb = nil
+        @pid = @xvfb = @user_data_dir = nil
         @logger = options[:logger]
         @process_timeout = options.fetch(:process_timeout, PROCESS_TIMEOUT)
 

lib/ferrum/frame.rb

@@ -11,6 +11,7 @@ class Frame
     attr_accessor :id, :name
 
     def initialize(id, page, parent_id = nil)
+      @execution_id = nil
       @id, @page, @parent_id = id, page, parent_id
     end
 

spec/browser_spec.rb

@@ -563,8 +563,9 @@ module Ferrum
 
     it "does not run into content quads error" do
       browser.go_to("/ferrum/index")
-      Node.any_instance.stub(:get_content_quads)
-                       .and_raise(Ferrum::BrowserError, 'message' => 'Could not compute content quads')
+
+      allow_any_instance_of(Node).to receive(:get_content_quads).and_raise(Ferrum::BrowserError, 'message' => 'Could not compute content quads')
+
       browser.at_xpath("//a[text() = 'JS redirect']").click
       expect(browser.body).to include("Hello world")
     end