buildscripts: run Android interop tests on Firebase (#4314)

android-interop-testing/app/src/androidTest/java/io/grpc/android/integrationtest/InteropInstrumentationTest.java

@@ -38,7 +38,7 @@ import org.junit.runner.RunWith;
 
 @RunWith(AndroidJUnit4.class)
 public class InteropInstrumentationTest {
-  private static final int TIMEOUT_SECONDS = 10;
+  private static final int TIMEOUT_SECONDS = 60;
   private static final String LOG_TAG = "GrpcInteropInstrumentationTest";
 
   private String host;

buildscripts/kokoro/android-interop.cfg

@@ -0,0 +1,5 @@
+# Config file for internal CI
+
+# Location of the continuous shell script in repository.
+build_file: "grpc-java/buildscripts/kokoro/android-interop.sh"
+timeout_mins: 45

buildscripts/kokoro/android-interop.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+set -exu -o pipefail
+if [[ -f /VERSION ]]; then
+  cat /VERSION
+fi
+
+# Install gRPC and codegen for the Android interop app
+# (a composite gradle build can't find protoc-gen-grpc-java)
+
+cd github/grpc-java
+
+export GRADLE_OPTS=-Xmx512m
+export LDFLAGS=-L/tmp/protobuf/lib
+export CXXFLAGS=-I/tmp/protobuf/include
+export LD_LIBRARY_PATH=/tmp/protobuf/lib
+export OS_NAME=$(uname)
+
+# Proto deps
+buildscripts/make_dependencies.sh
+
+./gradlew install
+
+
+# Build and run interop instrumentation tests on Firebase Test Lab
+cd android-interop-testing
+../gradlew assembleDebug
+../gradlew assembleDebugAndroidTest
+gcloud firebase test android run \
+  --type instrumentation \
+  --app app/build/outputs/apk/debug/app-debug.apk \
+  --test app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk \
+  --environment-variables \
+      server_host=grpc-test.sandbox.googleapis.com,server_port=443,test_case=all \
+  --device model=Nexus6P,version=27,locale=en,orientation=portrait \
+  --device model=Nexus6P,version=26,locale=en,orientation=portrait \
+  --device model=Nexus6P,version=25,locale=en,orientation=portrait \
+  --device model=Nexus6P,version=24,locale=en,orientation=portrait \
+  --device model=Nexus6P,version=23,locale=en,orientation=portrait \
+  --device model=Nexus6,version=22,locale=en,orientation=portrait \
+  --device model=Nexus6,version=21,locale=en,orientation=portrait