android-interop-testing: migrate AndroidJUnit4 runner

Author: dapengzhang0

android-interop-testing/build.gradle

@@ -76,8 +76,8 @@ dependencies {
 
     compileOnly libraries.javax_annotation
 
-    androidTestImplementation 'androidx.test:rules:1.1.0-alpha1'
-    androidTestImplementation 'androidx.test:runner:1.1.0-alpha1'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3',
+            'androidx.test:runner:1.4.0'
 }
 
 // Checkstyle doesn't run automatically with android

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

@@ -16,11 +16,12 @@
 
 package io.grpc.android.integrationtest;
 
-import static junit.framework.Assert.assertEquals;
+import static org.junit.Assert.assertEquals;
 
 import android.util.Log;
-import androidx.test.InstrumentationRegistry;
-import androidx.test.runner.AndroidJUnit4;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
 import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
 import com.google.android.gms.common.GooglePlayServicesRepairableException;
 import com.google.android.gms.security.ProviderInstaller;
@@ -59,7 +60,7 @@ public void setUp() throws Exception {
 
     if (useTls) {
       try {
-        ProviderInstaller.installIfNeeded(InstrumentationRegistry.getTargetContext());
+        ProviderInstaller.installIfNeeded(ApplicationProvider.getApplicationContext());
       } catch (GooglePlayServicesRepairableException e) {
         // The provider is helpful, but it is possible to succeed without it.
         // Hope that the system-provided libraries are new enough.
@@ -110,7 +111,7 @@ public void onComplete(String result) {
         };
     InputStream testCa;
     if (useTestCa) {
-      testCa = InstrumentationRegistry.getTargetContext().getResources().openRawResource(R.raw.ca);
+      testCa = ApplicationProvider.getApplicationContext().getResources().openRawResource(R.raw.ca);
     } else {
       testCa = null;
     }