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" }
+}

OlympusServices/app/src/main/java/com/uottawa/olympus/olympusservices/DBHelper.java

@@ -6,6 +6,13 @@ import android.database.sqlite.SQLiteOpenHelper;
 import android.database.Cursor;
 import android.content.ContentValues;
 
+/**
+ * The class DBHelper allows the Android application to access and perform
+ * CRUD operations on the tables of the SQLite database.
+ * There is currently a table of all users' login information.
+ *
+ * To use, create an object of this class with the current activity as context.
+ */
 
 public class DBHelper extends SQLiteOpenHelper {
 

OlympusServices/app/src/test/java/com/uottawa/olympus/olympusservices/DBUnitTest.java

@@ -3,17 +3,20 @@ package com.uottawa.olympus.olympusservices;
 import android.content.Context;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
-import android.support.test.InstrumentationRegistry;
+
-import android.support.test.runner.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
 
 import static org.junit.Assert.*;
 
-@RunWith(AndroidJUnit4.class)
+@RunWith(RobolectricTestRunner.class)
-public class DBTest {
+@Config(packageName = "com.uottawa.olympus.olympusservices")
-    private DBHelper dbHelper = new DBHelper(InstrumentationRegistry.getTargetContext());
+public class DBUnitTest {
+    private DBHelper dbHelper = new DBHelper(RuntimeEnvironment.application);
 
     @Test
     public void testAddAndDeleteUser(){
@@ -54,13 +57,13 @@ public class DBTest {
 
 
         deleted = dbHelper.deleteUser("admin");
-        assertEquals(true, deleted);
+        assertTrue(deleted);
 
         deleted = dbHelper.deleteUser("mgarzon");
-        assertEquals(true, deleted);
+        assertTrue(deleted);
 
         deleted = dbHelper.deleteUser("jguzman");
-        assertEquals(true, deleted);
+        assertTrue(deleted);
 
     }
 
@@ -71,7 +74,7 @@ public class DBTest {
 
         added = dbHelper.addUser(new User("mgarzon", "soccer", "Miguel", "Garzon"));
         assertTrue(added);
-        added = dbHelper.addUser(new ServiceProvider("mgarzon", "soccer", "Miguel", "Garzon"));
+        added = dbHelper.addUser(new ServiceProvider("mgarzon", "seg2105", "Juan", "Guzman"));
         assertTrue(!added);
 
         dbHelper.deleteUser("mgarzon");