Added test-projects to solution and upgraded build to latest tools.

app/build.gradle

@@ -2,22 +2,35 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion "23.0.3"
 
     defaultConfig {
         applicationId "org.hitlabnz.sensor_fusion_demo"
-        minSdkVersion 11
+        minSdkVersion 18
         targetSdkVersion 23
+        versionCode 4
+        versionName "1.3"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
         release {
             minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
 }
 
 dependencies {
-    compile 'com.android.support:support-v4:23.2.0'
+    compile 'com.android.support:support-v4:23.3.0'
+
+    testCompile 'junit:junit:4.12'
+    testCompile 'org.mockito:mockito-core:1.10.19'
+
+    androidTestCompile 'com.android.support:support-annotations:23.3.0'
+    androidTestCompile 'com.android.support.test:runner:0.4.1'
+    androidTestCompile 'com.android.support.test:rules:0.4.1'
+    androidTestCompile 'org.hamcrest:hamcrest-library:1.3'
+    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
+    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.1'
 }

app/proguard-rules.pro

@@ -0,0 +1,17 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/alex/Library/Developer/Xamarin/android-sdk-macosx/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

app/src/androidTest/java/org/hitlabnz/sensor_fusion_demo/androidTest/ApplicationTest.java

@@ -0,0 +1,66 @@
+package org.hitlabnz.sensor_fusion_demo.androidTest;
+
+import android.app.Application;
+import android.support.test.espresso.matcher.ViewMatchers;
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+import android.test.ApplicationTestCase;
+import android.test.suitebuilder.annotation.LargeTest;
+
+import org.hitlabnz.sensor_fusion_demo.R;
+import org.hitlabnz.sensor_fusion_demo.SensorSelectionActivity;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static android.support.test.espresso.Espresso.onView;
+import static android.support.test.espresso.action.ViewActions.click;
+import static android.support.test.espresso.assertion.ViewAssertions.matches;
+import static android.support.test.espresso.matcher.ViewMatchers.hasLinks;
+import static android.support.test.espresso.matcher.ViewMatchers.withId;
+import static android.support.test.espresso.matcher.ViewMatchers.withText;
+
+///**
+// * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+// */
+//public class ApplicationTest extends ApplicationTestCase<Application> {
+//    public ApplicationTest() {
+//        super(Application.class);
+//    }
+//}
+
+@RunWith(AndroidJUnit4.class)
+@LargeTest
+public class ApplicationTest {
+
+    @Rule
+    public ActivityTestRule mActivityRule = new ActivityTestRule<>(
+            SensorSelectionActivity.class);
+
+    @Test
+    public void checkAssertMenuExists(){
+        DiscardGyroscopeWarning();
+
+        // Act & Assert
+        AssertThatAboutActionMenuExists();
+    }
+
+    @Test
+    public void clickAboutMenu_expectAboutToBeDisplayed(){
+        DiscardGyroscopeWarning();
+
+        // Act
+        onView(withId(R.id.action_about)).perform(click());
+
+        onView(withId(R.id.webViewAbout)).check(matches(ViewMatchers.isDisplayed()));
+    }
+
+
+    public void AssertThatAboutActionMenuExists() {
+        onView(withId(R.id.action_about)).check(matches(withText("About")));
+    }
+
+    public static void DiscardGyroscopeWarning() {
+        onView(withText("OK")).perform(click());
+    }
+}

app/src/main/AndroidManifest.xml

@@ -1,12 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.hitlabnz.sensor_fusion_demo"
-    android:versionCode="3"
-    android:versionName="1.2" >
-
-    <uses-sdk
-        android:minSdkVersion="11"
-        android:targetSdkVersion="19" />
+    package="org.hitlabnz.sensor_fusion_demo" >
 
     <application
         android:allowBackup="false"
@@ -19,7 +13,6 @@
             android:screenOrientation="nosensor" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

app/src/test/java/org/hitlabnz/sensor_fusion_demo/test/QuaternionTest.java

@@ -0,0 +1,30 @@
+package org.hitlabnz.sensor_fusion_demo.test;
+
+import org.hitlabnz.sensor_fusion_demo.representation.Quaternion;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
+/**
+ * To work on unit tests, switch the Test Artifact in the Build Variants view.
+ */
+public class QuaternionTest {
+
+    @Test
+    public void quaternion_loadUnityQuaternion_expectCorrectValues() throws Exception {
+
+        // Arrange
+        Quaternion q = new Quaternion();
+
+        // Act
+        q.loadIdentityQuat();
+
+        // Assert
+        assertThat(q.w(), is(equalTo(1.0f)));
+        assertThat(q.x(), is(equalTo(0.0f)));
+        assertThat(q.y(), is(equalTo(0.0f)));
+        assertThat(q.z(), is(equalTo(0.0f)));
+    }
+}
+

build.gradle

@@ -2,6 +2,7 @@
 buildscript {
     repositories {
         jcenter()
+        maven { url 'http://repo1.maven.org/maven2' }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.1.0'
@@ -11,5 +12,10 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        maven { url 'http://repo1.maven.org/maven2' }
     }
 }
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}