feature: test code for multiple iOS simulators (#637)

* add test sample

* add rake style

* update parallel tests

* remove unused require

* arrange a bit

Author: KazuCocoa

ios_tests/Rakefile

@@ -52,3 +52,40 @@ RuboCop::RakeTask.new(:rubocop) do |t|
   t.options = %w(-D)
   t.fail_on_error = false
 end
+
+desc 'Run tests with parallel'
+task :run_parallel do
+  require 'thread'
+  require_relative 'parallel/test'
+  def device1
+    {
+        automationName: 'xcuitest',
+        platformName: 'ios',
+        platformVersion: '11.0',
+        deviceName: 'iPhone 6',
+        app: "#{Dir.pwd}/../test_apps/UICatalog.app",
+        wdaLocalPort: 8100
+    }
+  end
+
+  def device2
+    {
+        automationName: 'xcuitest',
+        platformName: 'ios',
+        platformVersion: '11.0',
+        deviceName: 'iPhone 6s',
+        app: "#{Dir.pwd}/../test_apps/UICatalog.app",
+        wdaLocalPort: 8200
+    }
+  end
+
+  threads = []
+  [device1, device2].each do |capability|
+    threads << Thread.new do
+      # RSpec::Core::RakeTask.new(:spec)
+      TestParallelRun.new(capability).test_run
+    end
+  end
+
+  threads.each(&:join)
+end

ios_tests/parallel/test.rb

@@ -0,0 +1,51 @@
+require_relative '../../lib/appium_lib'
+
+def des_server_caps
+  {
+      debug: true,
+      server_url: "#{ENV['appium_server'] ||= 'http://127.0.0.1:4723'}/wd/hub",
+      wait: 25,
+      wait_timeout: 20,
+      wait_interval: 0.3
+  }
+end
+
+class TestParallelRun
+  def initialize(capability)
+    @capability = capability
+  end
+
+  def setup
+    @appium = Appium::Driver.new({ caps: @capability, appium_lib: des_server_caps }, false)
+    @appium.start_driver
+
+    Appium.promote_appium_methods [self.class], @appium
+  end
+
+  def teardown
+    quit_driver
+    puts "finish: #{@capability}"
+  end
+
+  def test_run
+    setup
+
+    # tap alert
+    find_element(:name, 'Alerts').click
+    wait_true do
+      find_element(:name, 'Show OK-Cancel').click
+      find_element(:name, 'UIActionSheet <title>').displayed?
+    end
+    alert action: 'accept'
+    back
+
+    sleep 5
+
+    # TouchAction
+    text_elem = text(app_strings['ButtonsExplain'])
+    tap x: 0, y: 0, element: text_elem
+    back
+
+    teardown
+  end
+end

lib/appium_lib/common/patch.rb

@@ -130,7 +130,7 @@ def execute(command, opts = {}, command_hash = nil)
         Appium::Logger.ap_info command_hash
       end
 
-      if $driver.global_webdriver_http_sleep
+      if !$driver.nil? && $driver.global_webdriver_http_sleep
         warn '[DEPRECATION] global_webdriver_http_sleep will be removed. Please arrange with timeout.'
 
         delay = $driver.global_webdriver_http_sleep