added emulator support to circle.ci

Summary: Closes https://github.com/facebook/react-native/pull/4911

Reviewed By: svcscm

Differential Revision: D2789142

Pulled By: androidtrunkagent

fb-gh-sync-id: 9fd9520c27fc9acb7b139de6843a71ca3f918249

ReactAndroid/build.gradle

@@ -187,7 +187,7 @@ task buildReactNdkLib(dependsOn: [prepareJSC, prepareBoost, prepareDoubleConvers
             "NDK_LIBS_OUT=$buildDir/react-ndk/all",
             "THIRD_PARTY_NDK_DIR=$buildDir/third-party-ndk",
             '-C', file('src/main/jni/react/jni').absolutePath,
-            '--jobs', Runtime.runtime.availableProcessors()
+            '--jobs', project.hasProperty("jobs") ? project.property("jobs") : Runtime.runtime.availableProcessors()
 }
 
 task cleanReactNdkLib(type: Exec) {

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactAppTestActivity.java

@@ -36,7 +36,8 @@ public class ReactAppTestActivity extends FragmentActivity implements
 
   private static final String DEFAULT_BUNDLE_NAME = "AndroidTestBundle.js";
   private static final int ROOT_VIEW_ID = 8675309;
-  private static final long IDLE_TIMEOUT_MS = 15000;
+  // we need a bigger timeout for CI builds because they run on a slow emulator
+  private static final long IDLE_TIMEOUT_MS = 60000;
 
   private CountDownLatch mLayoutEvent = new CountDownLatch(1);
   private @Nullable ReactBridgeIdleSignaler mBridgeIdleSignaler;

circle.yml

@@ -1,16 +1,36 @@
 machine:
   node:
     version: 5.1.0
+  environment:
+    PATH: "~/$CIRCLE_PROJECT_REPONAME/gradle-2.9/bin:$PATH"
+    TERM: "dumb"
+    ADB_INSTALL_TIMEOUT: "10"
+    GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx512m -XX:+HeapDumpOnOutOfMemoryError"'
 
 dependencies:
   pre:
   - npm install -g npm@3.2
-
+  - wget "https://services.gradle.org/distributions/gradle-2.9-bin.zip"; unzip gradle-2.9-bin.zip
 test:
+  pre:
+    # starting emulator in advance because it takes very long to boot
+    # the side effect is that we loose 1GB of RAM for all the following commands
+    # if builds are running out of memory move the emulator start right before `wait-for-boot`
+    - emulator -avd circleci-android22 -no-audio -no-window:
+              background: true
+              parallel: true
   override:
-    # gradle is flaky in CI envs, found a solution here http://stackoverflow.com/questions/28409608/gradle-assembledebug-and-predexdebug-fail-with-circleci
-    - TERM=dumb ./gradlew testDebugUnitTest -PpreDexEnable=false -Pcom.android.build.threadPoolSize=1 -Dorg.gradle.parallel=false -Dorg.gradle.jvmargs="-Xms512m -Xmx512m" -Dorg.gradle.daemon=false
-    # build JS bundle
+    # build ndkreactlib first because it consumes memory and downloads stuff
+    - ./gradlew :ReactAndroid:buildReactNdkLib -PdisablePreDex -Pjobs=1
+    # unit tests
+    - ./gradlew :ReactAndroid:testDebugUnitTest -PdisablePreDex
+    # build JS bundle for instrumentation tests
     - node local-cli/cli.js bundle --platform android --dev true --entry-file ReactAndroid/src/androidTest/assets/TestBundle.js --bundle-output ReactAndroid/src/androidTest/assets/AndroidTestBundle.js
     # run instrumentation tests on device
-    - TERM=dumb ./gradlew connectedCheck
+    - circle-android wait-for-boot
+    - sleep 5
+    # unlock the emulator screen
+    - adb shell input keyevent 82
+    - sleep 5
+    # run tests on the emulator
+    - ./gradlew :ReactAndroid:connectedAndroidTest -PdisablePreDex --stacktrace