Espresso test case to control loopback call

webrtc/examples/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 } else if (is_mac) {
   import("//build/config/mac/rules.gni")
 } else if (is_ios) {
   import("//build/config/ios/rules.gni")
 }
 
 group("examples") {
   # This target shall build all targets in examples.
   testonly = true
   public_deps = []
 
   if (is_android) {
     public_deps += [
       ":AppRTCMobile",
       ":AppRTCMobileTest",
+      ":AppRTCMobileTestStubbedVideoIO",
     ]
   }
 
   if (!build_with_chromium) {
     public_deps += [ ":stun_prober" ]
   }
 
   if (is_ios || (is_mac && target_cpu != "x86")) {
     public_deps += [ ":AppRTCMobile" ]
   }
@@ skipping 71 matching lines @@
     java_files = [
       "androidtests/src/org/appspot/apprtc/test/FileVideoCapturerTest.java",
       "androidtests/src/org/appspot/apprtc/test/PeerConnectionClientTest.java",
       "androidtests/src/org/appspot/apprtc/test/VideoFileRendererTest.java",
     ]
 
     apk_under_test = ":AppRTCMobile"
 
     deps = [
       ":AppRTCMobile_javalib",
+      "//third_party/android_support_test_runner:rules_java",

[kjellander_webrtc, 2016/12/27 06:31:42]

Please remove line 120-124 as they're no longer needed for this target.

[mandermo, 2017/01/03 14:17:58]

I manage to remove all the lines exept line 122, then I get this error:
"java.lang.ClassNotFoundException: Didn't find class
"android.support.test.runner.AndroidJUnitRunner"

[kjellander_webrtc, 2017/01/04 15:10:08]

Ah, that's probably related to the AndroidManifest.xml change.
Please replace it with //third_party/android_support_test_runner:runner_java
instead. The android.support.test.runner.AndroidJUnitRunner class is a part of
that target as well: 
https://cs.chromium.org/chromium/src/third_party/android_support_test_runner/...
I verified it by running
jar tvf
third_party/android_support_test_runner/lib/runner-0.5-release-no-dep.jar |grep
AndroidJUnitRunner

+      "//third_party/android_support_test_runner:runner_java",
+      "//third_party/espresso:espresso_all_java",
+      "//third_party/hamcrest:hamcrest_java",
+      "//third_party/junit",
       "//webrtc/sdk/android:libjingle_peerconnection_java",
     ]
 
     data = [
       "//webrtc/examples/androidtests/src/org/appspot/apprtc/test/capturetestvideo.y4m",
     ]
   }
+
+  instrumentation_test_apk("AppRTCMobileTestStubbedVideoIO") {
+    apk_name = "AppRTCMobileTestStubbedVideoIO"
+    android_manifest = "androidtests/AndroidManifest.xml"
+
+    java_files = [ "androidtests/src/org/appspot/apprtc/test/ConnectActivityStubbedInputOutputTest.java" ]
+
+    apk_under_test = ":AppRTCMobile"
+
+    deps = [
+      ":AppRTCMobile_javalib",
+      "//third_party/android_support_test_runner:rules_java",
+      "//third_party/android_support_test_runner:runner_java",
+      "//third_party/espresso:espresso_all_java",
+      "//third_party/hamcrest:hamcrest_java",
+      "//third_party/junit",
+      "//webrtc/sdk/android:libjingle_peerconnection_java",
+    ]
+
+    data = [
+      "//resources/reference_video_640x360_30fps.y4m",
+    ]
+  }
 }
 
 if (is_ios || (is_mac && target_cpu != "x86")) {
   config("warnings_config") {
     # GN orders flags on a target before flags from configs. The default config
     # adds these flags so to cancel them out they need to come from a config and
     # cannot be on the target directly.
     if (is_ios) {
       # Suppress compiler warnings about deprecated that triggered
       # when moving from ios_deployment_target 7.0 to 9.0.
@@ skipping 453 matching lines @@
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
 
     deps = [
       "../p2p:libstunprober",
       "../p2p:rtc_p2p",
       "../system_wrappers:field_trial_default",
     ]
   }
 }