Fixed CI stability: running android tests via emulator not graddle:co…

Summary:Running CI tests with emulator, not a graddle wrapper.
This should make things faster
Closes https://github.com/facebook/react-native/pull/6421

Differential Revision: D3042505

fb-gh-sync-id: 455264f90044c22ed3ec8cf9cb6d5edc2efedcdb
shipit-source-id: 455264f90044c22ed3ec8cf9cb6d5edc2efedcdb

circle.yml

@@ -52,19 +52,19 @@ test:
 
     # instrumentation tests
     # compile native libs with Gradle script
-    - ./gradlew :ReactAndroid:packageReactNdkLibsForBuck -PdisablePreDex -Pjobs=1:
+    - ./gradlew :ReactAndroid:packageReactNdkLibsForBuck -Pjobs=1:
         timeout: 360
     # 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
     # build test APK
     - buck/bin/buck install ReactAndroid/src/androidTest/buck-runner:instrumentation-tests --config build.threads=1
     # run installed apk with tests
-    - ./scripts/run-android-instrumentation-tests.sh com.facebook.react.tests
+    - source scripts/circle-ci-android-setup.sh && retry3 ./scripts/run-android-instrumentation-tests.sh com.facebook.react.tests
 
     # Deprecated: run tests with Gradle, we keep them for a while to compare performance
-    - ./gradlew :ReactAndroid:testDebugUnitTest -PdisablePreDex
+    - ./gradlew :ReactAndroid:testDebugUnitTest
-    - ./gradlew :ReactAndroid:connectedAndroidTest -PdisablePreDex --stacktrace --info:
+    - ./gradlew :ReactAndroid:installDebugAndroidTest
-        timeout: 360
+    - source scripts/circle-ci-android-setup.sh && retry3 ./scripts/run-android-instrumentation-tests.sh com.facebook.react.tests.gradle
 
     # Publish to Sinopia, create a new app using 'react-native init' and check the packager starts
     - ./scripts/e2e-test.sh --packager

scripts/circle-ci-android-setup.sh

@@ -20,3 +20,22 @@ function waitForAVD {
     echo "emulator status=$bootanim"
   done
 }
+
+function retry3 {
+  local n=1
+  local max=3
+  local delay=1
+  while true; do
+    "$@" && break || {
+      if [[ $n -lt $max ]]; then
+        ((n++))
+        echo "Command failed. Attempt $n/$max:"
+        sleep $delay;
+      else
+        echo "The command has failed after $n attempts." >&2
+        return 1
+      fi
+    }
+  done
+}
+