add mobile command on espresso driver (#213)

* add mobile command on espresso driver

* fix rubocop

* relax assertions

Author: KazuCocoa

ci-jobs/functional_test.yml

@@ -228,3 +228,20 @@ jobs:
       - template: ./functional/publish_test_result.yml
         parameters:
           xcodeVersion: 'func_test_android_android4'
+
+  - job: func_test_android_mobile_command_espresso
+    pool:
+      vmImage: ${{ parameters.vmImage }}
+    variables:
+      CI: true
+      ANDROID_SDK_VERSION: 28
+      AUTOMATION_NAME_DROID: espresso
+    steps:
+      - template: ./functional/android_setup.yml
+      - template: ./functional/run_appium.yml
+      - script: |
+          bundle exec rake test:func:android TEST=test/functional/android/android/mobile_commands_test.rb
+        displayName: Run tests
+      - template: ./functional/publish_test_result.yml
+        parameters:
+          xcodeVersion: 'func_test_android_mobile_command_espresso'

test/functional/android/android/mobile_commands_test.rb

@@ -183,6 +183,13 @@ def test_backdoor
 
         assert_mobile_command_error 'mobile: backdoor', { target: :activity, methods: [{ name: 'noMethod', args: [] }] },
                                     'No public method noMethod definded on class io.appium.android.apis.view.TextSwitcher1'
+
+        e = @driver.find_elements :class, 'android.widget.TextView'
+        assert_equal '0', e.last.text
+
+        type = @driver.execute_script('mobile: backdoor',
+                                      { target: :element, elementId: e.last.ref, methods: [{ name: 'getTypeface' }] })
+        assert type['mStyle']
       end
 
       # @since Appium 1.12.0 (Espresso driver 1.8.0~)