Added testing framework for local unit tests and instrumented unit tests

androidTest/java/org/aprsdroid/app/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package org.aprsdroid.app;
+
+import android.content.Context;
+
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("org.aprsdroid.app", appContext.getPackageName());
+    }
+}

build.gradle

@@ -69,6 +69,7 @@ def mapsApiKey() {
 
 android {
 	compileSdkVersion 28
+	buildToolsVersion "28.0.3"
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 28
@@ -79,6 +80,8 @@ android {
 		resValue "string", "build_version", "$build_version"
 
 		resValue "string", "google_maps_key", mapsApiKey()
+
+		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 	}
 	useLibrary 'org.apache.http.legacy'
 	compileOptions {
@@ -127,6 +130,12 @@ android {
 			assets.srcDirs = ['assets']
 			jniLibs.srcDirs = ['libs']
 		}
+		androidTest {
+			java.srcDirs = ['androidTest/java']
+		}
+		test {
+			java.srcDirs = ['test/java']
+		}
 	}
 	lintOptions {
 		disable 'MissingTranslation'
@@ -147,4 +156,7 @@ dependencies {
 	implementation 'com.google.maps.android:android-maps-utils:0.5'
 
 	implementation 'com.squareup.okio:okio:2.1.0'
+	androidTestImplementation 'com.android.support.test:runner:1.0.2'
+	androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+	testImplementation 'junit:junit:4.12'
 }

test/java/org/aprsdroid/app/AprsPacketTests.java

@@ -0,0 +1,12 @@
+package org.aprsdroid.app;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class AprsPacketTests {
+	@Test
+	public void testBasic() {
+		assertEquals(18403, AprsPacket.passcode("AB1CD"));
+	}
+}