Testing your app

#androidtest #unittest #integrationtest

Transcript

1. T E S T I N G Y O U R A P P J O S É C A I Q U E
2. W E W I L L S E E • Test advantages • How to write Unit Testing • How to write Integration Test • How to write Acceptance Test
3. Why should I take care about testing?
4. No one has perfect code
5. A D VA N TA G E S O F T E S T I N G • Keep code simple • Scalability • Best way to find bugs • Indicates refactoring opportunities
6. If you test is failing, verify the code instead of delete the test I M P O R TA N T
7. Why start to write tests are so difficult ?
8. Write the code Write the test Hard to test? Refactor the code W R I T I N G T E S T
9. Acceptance Test Integration Test Unit Test
10. val maxRetries: Int = 4 fun shouldRetry(retryCount: Int): Boolean { return retryCount < maxRetries } W R I T I N G U N I T T E S T
11. @Test fun `verify if should proceed with retries`(){ val retryCount = 3 val shouldProceed = shouldRetry(retryCount) assert(shouldProceed == true) } JUnit W R I T I N G U N I T T E S T
12. Write small functions
13. W R I T I N G U N I T T E S T - M O C K Retrieve Movie - Real Retrieve Movie - MOCK Fake< > Movie(name ="Madman", url = "tt123") listOf(Movies)
14. class ImdbViewModel(private val cache: CacheService): ViewModel { companion object { val URL = "https://m.imdb.com"} fun url() : String { return cacheService.retrieve<Movie>(Detail)?.let { "$URL/title/${imdb.value}" } ?: URL } W R I T I N G U N I T T E S T
15. @Test fun `given a movie mount the url`() { val url = vm.url() assertThat(url) .isEqualTo(ImdbViewModel.URL + "/title/tt123" ) } assertJ W R I T I N G U N I T T E S T
16. private val cache = mock<CacheService>() private val vm: ImdbViewModel(cache) private fun `cache return value`() { whenever(cache.retrieve<Movie>(any())) .thenAnswer { movie } } private val movie = Movie(name = "Madman", url = "tt123") Mockito/Mockito Kotlin W R I T I N G U N I T T E S T - M O C K I N G
17. @Test fun `given a movie mount the url`() { `cache return a value`() val url = vm.url() assertThat(url) .isEqualTo(ImdbViewModel.URL + "/title/tt123" ) } W R I T I N G U N I T T E S T
18. class ImdbViewModel(): ViewModel { private val cache: CacheService = CacheService() ... } SOLID
19. class FileCreator(private val context: Context) { private val RECEIPTS_PATH = "receipts" fun create(receiptInfo: FileReceipt): File { val pathFile = context.cacheDir return pathFile .resolve(RECEIPTS_PATH) .apply { if (!exists()) mkdir() } .resolve(“receipt.pdf”) .apply { this.writeBytes(receiptInfo.byteArray) } } } W R I T I N G U N I T T E S T
20. private lateinit var creator: ReceiptFileCreator private val receipt = FileReceipt("123".toByteArray(),"fileName") @Before fun `before each test`() { val context = RuntimeEnvironment.application.applicationContext creator = ReceiptFileCreator(context) } @Test fun `given a file receipt should create a file`() { val file = creator.create(receiptInfo) assertThat(file.name).isEqualTo("fileName.pdf") } W R I T I N G U N I T T E S T - A N D R O I D robolectric
21. Function Function N Function 1 Unit Test Integration Test
22. object CountTheWords { operator fun invoke(text: String): Map<String, Int> { return text .split(' ') .asSequence() .filter { it.isNotBlank() } .groupingBy { it } .eachCount() } } object GetEveryTenthPosition { operator fun invoke(text: String): String { return text .asSequence() .filterIndexed { index, _ -> (index + 1) % 10 == 0 } .joinToString(" ") } }
23. interface BlogService { fun retrieveBlogPost(): Observable<String> } class BlogPostProcessor (private val api: BlogService) { fun process(): Observable<Result> { return api .retrieveBlogPost() .map{ text -> Result( everyTenthPosition = GetEveryTenthPosition(text), wordCount = CountTheWords(text)) } } } data class Result( val everyTenthPosition: String, val wordCount:Map<String, Int> )
24. class BlogPostProcessViewModel( private val useCase: BlogPostProcessor ) : ViewModel() { fun retrieveBlogPostInformation(): Observable<Result> { return useCase .process() } }
25. W R I T I N G I N T E G R AT I O N T E S T val useCase = mock<BlogPostProcessor>() val vm = BlogPostProcessViewModel(useCase) val api = mock<BlogService>() val useCase = BlogPostProcessor(api) val vm = BlogPostProcessViewModel(useCase)
26. W R I T I N G I N T E G R AT I O N T E S T fun `api return blog post`(){ val post = "a string to test the count count the words words" whenever(api.retrieveBlogPost()) .thenAnswer{ Observable.just(post) } } val expected = Result( wordCount = mapOf( "test" to 1, "count" to 2, "words" to 2), everyTenthPosition = "t t n n h w” ) @Test fun `given a blog post process the words`(){ `api return blog post`() val test = vm.retrieveBlogPostInformation().test() test.assertResult(expected) } RxJava Test
27. I N T E G R AT I O N T E S T - CountTheWords - GetEveryTenthPosition - BlogPostProcessor - BlogPostProcessViewModel
28. Write classes and functions with few parameters
29. A C C E P TA N C E T E S T S Function N Function 1 Integration Test Acceptance Test(UI) Fake Function 1 Function N UI Interaction
30. val url = "myapi.domain" retrofit.baseUrl(url) retrofit.baseUrl(“http://localhost:8080") var server = MockWebServer() server.start(8080) Fake MockWebServer
31. val shows = """ [ { "id": 250, "name": "Kirby", "language": "English", } ]""" val response = MockResponse() .setResponseCode(200) .setBody(shows) server.enqueue(response)
32. How can I change my url before start an activity test?
33. open class MyApplication : Application() { open val url = "http://api.tvmaze.com/" } //inside androidTest folder class TestApplication : MyApplication() { override val url: String get() = "http://localhost:8080" }
34. class MyRunner : AndroidJUnitRunner() { @Throws(InstantiationException::class, IllegalAccessException::class, ClassNotFoundException::class) override fun newApplication( cl: ClassLoader, className: String, c: Context): Application { return super .newApplication(cl, TestApplication::class.java.name, c) } } AndroidJUnitRunner
35. android { compileSdkVersion 28 defaultConfig { applicationId "com.package.androidfest" minSdkVersion 24 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "com.my.package.MyRunner" } }
36. UI Interaction onView(withId(R.id.myView)) .check(matches(isDisplayed())) onView(withText(R.string.my_text)) .check(matches(isDisplayed())) .perform(click()) Espresso Test
37. W R I T I N G A C C E P TA N C E T E S T @get:Rule val activity = ActivityTestRule(MainActivity::class.java, true, false) val response = MockResponse() .setBody(shows) //json .setResponseCode(200) var server = MockWebServer() @Test fun verify_content_proper_showed() { server.start(8080) server.enqueue(response) activity.launchActivity() onView(withId(R.id.toolbar)).check(matches(isDisplayed())) onView(withId(R.id.moviesRv)).check(matches(isDisplayed())) }
38. J C A I Q U E _ J O S E C A I Q U E J O S E C A I Q U E T H A N K S ! !
39. https://gitlab.com/jcaique.jc/githubtrends