Add Espresso dependencies and instrumented test configuration.

Author: Isira-Seneviratne

android/BOINC/app/build.gradle

@@ -76,6 +76,8 @@ android {
         // Required when setting minSdkVersion to 20 or lower
         multiDexEnabled true
         vectorDrawables.useSupportLibrary = true
+
+        testInstrumentationRunner = 'androidx.test.runner.AndroidJUnitRunner'
     }
 
     buildTypes {
@@ -158,6 +160,10 @@ dependencies {
     testImplementation 'org.robolectric:robolectric:4.3.1'
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junit5_version"
     testRuntimeOnly "org.junit.vintage:junit-vintage-engine:$junit5_version"
+
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0-beta02'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test:rules:1.3.0-beta02'
 }
 repositories {
     mavenCentral()