Start speking it @ Droidcon Krakow 2017

Spek is a fairly new framework that turns your testing code into an enjoyable story to both reader and writer. By writing tests as specifications they become really clean and straightforward, giving the tester confidence. They match perfectly with RxJava code and allow the use of some compelling techniques that makes the usually bored task of writing and reading tests quite entertaining.

1. Start Speking it. Rui Gonçalo @rmgoncalo Fábio Carballo @fabiocarballo
3. JUnit
6. Test Actions Groups
7. Test • it
8. Test it(“should be true”) { assertTrue(true) }
9. Groups • group
10. Groups group(“a testing group”) { group(“a nested group”) { } }
11. Groups group(“a testing group”) { group(“a nested group”) { } }
12. Groups describe(“a testing group”) { group(“a nested group”) { } }
13. Groups context(“a testing group”) { group(“a nested group”) { } }
14. Groups given(“a testing group”) { group(“a nested group”) { } }
15. Groups fun SpecBody.context(description: String, body: SpecBody.() -> Unit) { group("context $description", body = body) } fun SpecBody.given(description: String, body: SpecBody.() -> Unit) { group(“given $description", body = body) } fun SpecBody.describe(description: String, body: SpecBody.() -> Unit) { group(“describe $description", body = body) }
16. Actions • on
17. Actions on(“action that triggers the test”) { tested.actionThatTriggersIt() it(“should do X by Y”) { … } }
18. object SimpleSpec: Spek({ describe("a bakery") { val calculator = SampleCalculator() on(“bake bread") { val breads = bakery.mix(“salt”, “margarine” , “flour”) it(“should return some bread") { assertTrue(breads.isNotEmpty() } }
19. object SimpleSpec: Spek({ describe("a bakery") { val bakery = Bakery() on(“mixing bread ingredients”) { val breads = bakery.mix(“salt”, “margarine”, “flour”) it(“should return some bread") { assertTrue(breads.isNotEmpty() } } }
21. checkPermission GRANT DENY requestPermission onPermissionGranted onPermissionDenied getDistances getDistances showError
22. class Presenter( permissionsManager: PermissionsManager, distancesProvider: DistancesProvider, view: View) { }
23. interface PermissionsManager { fun checkPermission(): Observable<Boolean> fun requestPermissions(): Observable<Boolean> } class Presenter( permissionsManager: PermissionsManager, distancesProvider: DistancesProvider, view: View) { }
24. interface DistancesProvider { fun getDistances() : Observable<Int> } class Presenter( permissionsManager: PermissionsManager, distancesProvider: DistancesProvider, view: View) { } interface PermissionsManager { fun checkPermission(): Observable<Boolean> fun requestPermissions(): Observable<Boolean> }
25. interface View { fun showDistance(distance: Int) fun showError() } interface PermissionsManager { fun checkPermission(): Observable<Boolean> fun requestPermissions(): Observable<Boolean> } class Presenter( permissionsManager: PermissionsManager, distancesProvider: DistancesProvider, view: View) { } interface DistancesProvider { fun getDistances() : Observable<Int> }
26. permissionsManager.checkPermission() GRANT DENY permissionsManager.requestPermission() GRANT DENY distancesProvider.getDistances() view.showError() distancesProvider.getDistances()
27. permissionsManager.checkPermission() GRANT DENY permissionsManager.requestPermission() GRANT DENY distancesProvider.getDistances() view.showError() distancesProvider.getDistances()
28. checkPermission GRANT getDistances
29. checkPermission GRANT getDistances @Test fun when_check_permission_and_permission_is_granted_should_get_distance() { … }
30. @Test fun when_check_permission_and_permission_is_granted_should_get_distance() { whenever(permissionsManager.checkPermission()).thenReturn(Observable.just(true)) } checkPermission GRANT getDistances
31. @Test fun when_check_permission_and_permission_is_granted_should_get_distance() { whenever(permissionsManager.checkPermission()).thenReturn(Observable.just(true)) presenter.start() verify(distancesProvider).getDistance() } checkPermission GRANT getDistances
32. checkPermission DENY requestPermission onPermissionGranted getDistances
33. whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) checkPermission DENY requestPermission onPermissionGranted getDistances
34. whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) whenever(permissionsManager.requestPermission()) .thenReturn(Observable.just(true)) checkPermission DENY requestPermission onPermissionGranted getDistances
35. whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) whenever(permissionsManager.requestPermission()) .thenReturn(Observable.just(true)) presenter.start() verify(permissionsManager).requestPermission() verify(view).getDistances() checkPermission DENY requestPermission onPermissionGranted getDistances
36. checkPermission DENY requestPermission onPermissionDenied showError
37. whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) whenever(permissionsManager.requestPermission()) .thenReturn(Observable.just(false)) checkPermission DENY requestPermission onPermissionDenied showError
38. whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) whenever(permissionsManager.requestPermission()) .thenReturn(Observable.just(false)) checkPermission DENY requestPermission onPermissionDenied showError
39. whenever(permissionsManager.checkPermission()) .thenReturn(Single.just(false)) whenever(permissionsManager.requestPermission()) .thenReturn(Single.just(false)) presenter.start() verify(permissionsManager).requestPermission() verify(view).showError() checkPermission DENY requestPermission onPermissionDenied showError
40. checkPermission GRANT getDistances checkPermission DENY requestPermission onPermissionGranted getDistances checkPermission DENY requestPermission onPermissionDenied showError
41. checkPermission GRANT getDistances checkPermission DENY requestPermission onPermissionGranted getDistances checkPermission DENY requestPermission onPermissionDenied showError
42. checkPermission GRANT getDistances checkPermission DENY requestPermission onPermissionGranted getDistances checkPermission DENY requestPermission onPermissionDenied showError
43. Spek
44. checkPermission GRANT getDistances checkPermission DENY requestPermission onPermissionGranted getDistances checkPermission DENY requestPermission onPermissionDenied showError
45. checkPermission GRANT getDistances
46. describe(“check permission”) { context("permission is granted”) { it("should get distance”) { }
 }
 } checkPermission GRANT getDistances
47. describe(“check permission”) { context("permission is granted”) { it("should get distance”) { }
 }
 } checkPermission GRANT getDistances
48. describe(“check permission”) { context("permission is granted”) { it("should get distances”) { }
 }
 } checkPermission GRANT getDistances
49. describe(“check permission”) { context("permission is granted”) { it("should get distances”) { verify(distancesProvider).getDistances() }
 }
 } checkPermission GRANT getDistances
50. describe(“check permission”) { context("permission is granted”) { it("should get distances”) { verify(distancesProvider).getDistances() }
 } context("permission is denied”) { it(“should request permissions”) { verify(permissionsManager).requestPermissions() }
 }
 } checkPermission GRANT getDistances DENY requestPermission
51. describe(“check permission”) { … context("permission is denied”) { it(“should request permissions”) { … } given(“a permission request”) { on(“permission granted”) { it(“should get distance”) { … } } } } } checkPermission GRANT getDistances DENY requestPermission onPermissionGranted
52. describe(“check permission”) { … context("permission is denied”) { it(“should request permissions”) { … } given(“a permission request”) { on(“permission granted”) { it(“should get distances”) { } } } } } checkPermission GRANT getDistances DENY requestPermission onPermissionGranted getDistances
53. describe(“check permission”) { … context("permission is denied”) { it(“should request permissions”) { … } given(“a permission request”) { on(“permission granted”) { it(“should get distances”) { verify(distancesProvider).getDistances() } } } } } checkPermission GRANT getDistances DENY requestPermission onPermissionGranted getDistances
54. checkPermission GRANT getDistances DENY requestPermission onPermissionGranted getDistances onPermissionDenied showError describe(“check permission”) { context("permission is denied”) { given(“a permission request”) { on(“permission granted”) { it(“should get distances”) { … } } on(“permission denied”) { it(“should show error”) { verify(view).showError() } } } } }
55. describe(“check permission”) { context("permission is granted”) it(“should get distances”) { … } context(“permission is denied”) { it(“should request permission”) { … } given(“a permission request”) { on(“permission granted”) it(“should get distances”) { … } on(“permission denied”) it(“should show error”) { … } } } checkPermission GRANT getDistances DENY requestPermission onPermissionGranted getDistances onPermissionDenied showError
56. How to setup/teardown ?
57. beforeEachTest { } afterEachTest { }
58. describe(“check permission”) { context("permission is granted”) { it(“should get distances”) { … } } context(“permission is denied”) { it(“should request permission”) { … } given(“a permission request”) { on(“permission granted”) it(“should get distances”) { … } on(“permission denied”) it(“should show error”) { … } } }
59. describe(“check permission”) { context("permission is granted”) { it(“should get distances”) { … } } context(“permission is denied”) { it(“should request permission”) { … } given(“a permission request”) { on(“permission granted”) it(“should get distances”) { … } on(“permission denied”) it(“should show error”) { … } } }
60. describe(“check permission”) { context("permission is granted”) { it(“should get distances”) { … } } context(“permission is denied”) { it(“should request permission”) { … } } }
61. describe(“check permission”) { context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) tested.start() } it(“should get distances”) { … } } context(“permission is denied”) { it(“should request permission”) { … } } }
62. describe(“check permission”) { context("permission is granted”) { it(“should get distances”) { … } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Single.just(false)) tested.start() } it(“should request permission”) { … } } }
63. describe(“check permission”) { context("permission is granted”) { it(“should get distances”) { … } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) tested.start() } it(“should request permission”) { … } } }
64. describe(“check permission”) { context("permission is granted”) { } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) tested.start() } } }
65. describe(“check permission”) { context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) tested.start() } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) tested.start() } } }
66. describe(“check permission”) { context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) tested.start() } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) tested.start() } } }
67. describe(“start”) { context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) tested.start() } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) tested.start() } } }
68. describe(“start”) { beforeEachTest { tested.start() } context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) } } }
69. describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) { verify(permissionsManager).checkPermission() } context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) } } }
70. describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) } } }
71. describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } } context(“permission is denied”) { beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(false)) } } }
72. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { } }
73. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { } }
74. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(Observable.just(true)) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { it(“should request permission”) { … } } }
75. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(____________) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { it(“should request permission”) { … } } }
76. val permissionPubSub: PublishSubject<Boolean> = PublishSubject.create() beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { it(“should request permission”) { … } } }
77. val permissionPubSub: PublishSubject<Boolean> = PublishSubject.create() beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { it(“should request permission”) { … } } }
78. val permissionPubSub: PublishSubject<Boolean> = PublishSubject.create() beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { } context(“permission is denied”) { beforeEachTest { permissionPubSub.onNext(false) } it(“should request permission”) { … } } }
79. val permissionPubSub: PublishSubject<Boolean> = PublishSubject.create() beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { beforeEachTest { permissionPubSub.onNext(true) } it(“should get distances”) { … } } context(“permission is denied”) { beforeEachTest { permissionPubSub.onNext(false) } it(“should request permission”) { … } } }
80. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) whenever(permissionsManager.requestPermission()) .thenReturn(requestPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { beforeEachTest { permissionPubSub.onNext(true) } it(“should get distances”) { … } } context(“permission is denied”) { beforeEachTest { permissionPubSub.onNext(false) } it(“should request permission”) { … } } }
81. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) whenever(permissionsManager.requestPermission()) .thenReturn(requestPubSub) } describe(“start”) { beforeEachTest { tested.start() } it(“should check permission”) {…} context("permission is granted”) { beforeEachTest { permissionPubSub.onNext(true) } it(“should get distances”) { … } } context(“permission is denied”) { beforeEachTest { permissionPubSub.onNext(false) } it(“should request permission”) { … } } }
82. beforeEachTest { whenever(permissionsManager.checkPermission()) .thenReturn(permissionPubSub) whenever(permissionsManager.requestPermission()) .thenReturn(requestPubSub) } describe(“start”) { context(“permission is denied”) { given(“a permission request”) { on(“permission granted”) { requestPubSub.onNext(true) it(“should get distances”) { … } } on(“permission denied”) { requestPubSub.onNext(false) it(“should show error”) { … } } } } }
86. Cheat Sheet of Getting into Spek
87. org.mockito.exceptions.base.MockitoException: Cannot mock/spy class com.package.YourClass Mockito cannot mock/spy because : - final class
88. mock-maker-inline
89. Mockito.`when`(mapper.call(Mockito.any())).thenReturn(Entity()) fun call(a: A): B
90. Mockito.any() must not be null java.lang.IllegalStateException: Mockito.any() must not be null
91. Mockito.`when`(mapper.call(Mockito.any())).thenReturn(B()) fun call(a: A): B null
93. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { val immediate = object : Scheduler() { override fun scheduleDirect(run: Runnable, delay: Long, unit: TimeUnit): Disposable { return super.scheduleDirect(run, 0, unit) } override fun createWorker(): Scheduler.Worker { return ExecutorScheduler.ExecutorWorker(Runnable::run) } } beforeEachTest { RxJavaPlugins.setInitIoSchedulerHandler{ immediate } RxJavaPlugins.setInitComputationSchedulerHandler{ immediate } RxJavaPlugins.setInitNewThreadSchedulerHandler{ immediate } RxJavaPlugins.setInitSingleSchedulerHandler{ immediate } RxAndroidPlugins.setInitMainThreadSchedulerHandler { scheduler -> immediate } } given(description, body = body) afterEachTest { RxJavaPlugins.reset() RxAndroidPlugins.reset() } }
94. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { val immediate = object : Scheduler() { override fun scheduleDirect(run: Runnable, delay: Long, unit: TimeUnit): Disposable { return super.scheduleDirect(run, 0, unit) } override fun createWorker(): Scheduler.Worker { return ExecutorScheduler.ExecutorWorker(Runnable::run) } } beforeEachTest { RxJavaPlugins.setInitIoSchedulerHandler{ immediate } RxJavaPlugins.setInitComputationSchedulerHandler{ immediate } RxJavaPlugins.setInitNewThreadSchedulerHandler{ immediate } RxJavaPlugins.setInitSingleSchedulerHandler{ immediate } RxAndroidPlugins.setInitMainThreadSchedulerHandler { scheduler -> immediate } } given(description, body = body) afterEachTest { RxJavaPlugins.reset() RxAndroidPlugins.reset() } }
95. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { val immediate = object : Scheduler() { override fun scheduleDirect(run: Runnable, delay: Long, unit: TimeUnit): Disposable { return super.scheduleDirect(run, 0, unit) } override fun createWorker(): Scheduler.Worker { return ExecutorScheduler.ExecutorWorker(Runnable::run) } } beforeEachTest { RxJavaPlugins.setInitIoSchedulerHandler{ immediate } RxJavaPlugins.setInitComputationSchedulerHandler{ immediate } RxJavaPlugins.setInitNewThreadSchedulerHandler{ immediate } RxJavaPlugins.setInitSingleSchedulerHandler{ immediate } RxAndroidPlugins.setInitMainThreadSchedulerHandler { scheduler -> immediate } } given(description, body = body) afterEachTest { RxJavaPlugins.reset() RxAndroidPlugins.reset() } }
96. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { val immediate = object : Scheduler() { override fun scheduleDirect(run: Runnable, delay: Long, unit: TimeUnit): Disposable { return super.scheduleDirect(run, 0, unit) } override fun createWorker(): Scheduler.Worker { return ExecutorScheduler.ExecutorWorker(Runnable::run) } } beforeEachTest { RxJavaPlugins.setInitIoSchedulerHandler{ immediate } RxJavaPlugins.setInitComputationSchedulerHandler{ immediate } RxJavaPlugins.setInitNewThreadSchedulerHandler{ immediate } RxJavaPlugins.setInitSingleSchedulerHandler{ immediate } RxAndroidPlugins.setInitMainThreadSchedulerHandler { scheduler -> immediate } } given(description, body = body) afterEachTest { RxJavaPlugins.reset() RxAndroidPlugins.reset() } }
97. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { beforeEachTest { ArchTaskExecutor.getInstance().setDelegate(object : TaskExecutor() { override fun executeOnDiskIO(runnable: Runnable) { runnable.run() } override fun postToMainThread(runnable: Runnable) { runnable.run() } override fun isMainThread(): Boolean { return true } }) } given(description, body = body) afterEachTest { ArchTaskExecutor.getInstance().setDelegate(null) } }
98. fun SpecBody.rxGiven(description: String, body: SpecBody.() -> Unit) { beforeEachTest { ArchTaskExecutor.getInstance().setDelegate(object : TaskExecutor() { override fun executeOnDiskIO(runnable: Runnable) { runnable.run() } override fun postToMainThread(runnable: Runnable) { runnable.run() } override fun isMainThread(): Boolean { return true } }) } given(description, body = body) afterEachTest { ArchTaskExecutor.getInstance().setDelegate(null) } }
101. Thank you Rui Gonçalo @rmgoncalo Fábio Carballo @fabiocarballo