Testing in android

Testing in Android
Mission impossible?
http://joaoptrindade.com

Why automated tests
We all write crappy code and then refactor
We will break the app app
Humans suck at repetitive tasks
We won’t be able to always test everything
Users will be our ultimate testers
Ratings: ...that one star on the store....

What to test
Unit 2
OS interaction 5
Integration (network) 2
Acceptance 1
Performance 4

What to test
Unit 3
OS interaction 5
Integration (network) 2
Acceptance 1
Performance 4

How many of you do some type of automated tests on your android app?
Quick survey

Why is it so painful on Android
Speed
The way Android SDK is structured
You need to test on the device
Fragmentation

Compromises
Move tests to the JVM
Only test the bacon on Android
Monkeys are great testers
Help the QA guy! (probably your boss)

Move logic to the JVM
dependencies {
...
compile project (':domain')
compile project (':network')
}
.
├── build.gradle
├── app
│ ├── build.gradle
│ └── src
├── domain
│ ├── build.gradle
│ └── src
└── network
├── build.gradle
├── remote.iml
└── src
apply plugin: 'java'
apply plugin: 'java'
dependencies {
compile "com.squareup. retrofit:..."
compile "com.squareup. okhttp:..."
compile project( ':domain')
}

Business logic in a jar
Include your POJOS here
Put everything that is not Android specific
Implement use cases via interactors
class UseCase implements Interactor {
UseCase(Rulebook rules ) {
this.rules = rules;
}
public String getTitle(String userName, int age) {
if(rules.is_old_enough (age))
return "Mr " + username
}
}
public class User {
private final int userId;
public User(int userId) {
this.userId = userId;
}
public int getUserId() {
return userId;
}
@Override public String toString() {
...
return stringBuilder .toString();
}
}

Now you can unit test like you are used to.
import org.junit.Test;
public class MyTests {
@Test
public void multiplicationOfZeroIntegersShouldReturnZero () {
MyClass tester = new MyClass();
assertEquals ("10 x 0 must be 0" , 0, tester.multiply(10, 0));
}
}

Move logic to the JVM (network)
public interface RestInterface {
@POST("/user/create/" )
public void userRegister (
@Body UserRest user ,
Callback <UserRest> callback);
Use retrofit to do the network communication
RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint( https://api.github.com/")
. setClient(new OkHttpClient())
.build() ;

. setClient(new OkHttpClient())
.build() ;
. setClient(new MockClient())
.build() ;
public interface RestInterface {
@POST("/user/create/" )
public void userRegister (
@Body UserRest user ,
Callback <UserRest> callback);
Use retrofit to do the network communication

public class NewUserMockClient implements Client{
static String VALID_RESPONSE = "{ status: 'OK', id: %s }"
String json;
int code;
NewUserMockClient(String json, int code) {
this.json = json;
this.code = code;
}
static NewUserMockClient getOkMock(int id, String email) {
String response = String.format(VALID_RESP, userId)
return new NewUserMockClient(response, HTTP_OK_STATUS);
}
@Override
public Response execute(Request request)throws IOException {
return
new Response(request.url, code, ...,
new TypedByteArray(MIME_TYPE, json.getBytes()));
}
}

@Before
public void setUp() {
String email = getUUID() + "@somehost.com" ;
String pass = "pass";
user = new User(email, pass);
}
@Test
public void registerUserWithFamilyName() {
client = NewUserMockClient .getOkMock(userId, email);
RestAdapter restAdapter = new RestAdapter .Builder()
.setEndpoint (https://api.github.com/")
.setClient(newUserMockClient )
.build();
rest.userRegister (user);
assertThat (observable, something_you_expect );
}

@Before
public void setUp() {
String email = getUUID() + "@somehost.com" ;
String pass = "pass";
user = new User(email, pass);
}
@Test
public void registerUserWithFamilyName() {
client = NewUserMockClient .getOkMock(userId, email);
RestAdapter restAdapter = new RestAdapter .Builder()
.setEndpoint (https://api.github.com/")
.setClient(newUserMockClient )
.build();
rest.userRegister (user);
assertThat (observable, something_you_expect );
} http://riggaroo.co.za/mocking-api-responses-using-a-retrofit-client-in-android/

Focus on the bacon
Espresso @RunWith(AndroidJUnit4.class)
public class MainActivityEspressoTest {
@Test
public void ensureTextChangesWork () {
// Type text and then press the button.
onView (withId(R.id.inputField))
.perform(typeText("HELLO"), closeSoftKeyboard ());
onView (withId(R.id.changeText)).perform(click());
// Check that the text was changed.
onView (withId(R.id.inputField))
. check(matches(withText("Changed")));
}
}

Monkeys are great testers
$ adb shell monkey -p your.package.name -v 500

Help the QA guy
https://github.com/orhanobut/bee

Help the QA guy
@Override protected void onCreate(Bundle savedInstanceState) {
...
Bee.init(this)
.setBeeSize(100) //optional bee button size
.setBeePosition (Gravity.CENTER) //optional bee button position
.setBeeMargin (0, 0, 0, 400) //optional margin for the bee
button
.inject(SampleBeeConfig .class); //required
}

Help the QA guy
@Title("Select user")
@Spinner({"John Doe", "Foo Bar"})
public void onUserSelected(String selectedValue) {
doSomeInternalLogic(selectedValue);
}

Help the QA guy
But this is
not
automated

What to test
Unit 2 JVM
OS interaction 5 (Monkey...kind of)
Integration (network) 2 Retrofit + MockClient
Acceptance 1 Bee, Espresso
Performance 4
Debug only:
Android settings,
various other tools

Testing in android

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