Running unit tests with Robolectric instead of starting up emulator every time

OlympusServices/app/build.gradle

@@ -16,6 +16,11 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    testOptions {
+        unitTests {
+            includeAndroidResources = true
+        }
+    }
 }
 
 dependencies {
@@ -24,10 +29,14 @@ dependencies {
     implementation 'com.android.support:design:28.0.0'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
     testImplementation 'junit:junit:4.12'
+    testImplementation 'org.robolectric:robolectric:4.0-alpha-3-SNAPSHOT'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
     implementation 'com.jaredrummler:material-spinner:1.2.5'
     implementation 'com.android.support:design:28.0.0-alpha3'
     implementation 'com.rengwuxian.materialedittext:library:2.1.4'
-
 }
+
+repositories {
+    maven { url "https://oss.sonatype.org/content/repositories/snapshots" }
+}