Testing lesson 2 mockito

app/build.gradle

@@ -1,9 +1,7 @@
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
-    id("kotlin-parcelize")
 }
-apply plugin: 'kotlin-kapt'
 
 android {
     compileSdk 32
@@ -47,4 +45,15 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.4.2'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    testImplementation "org.mockito:mockito-core:2.19.0"
+    testImplementation 'org.mockito:mockito-inline:2.8.9'
+    testImplementation('com.nhaarman:mockito-kotlin:1.5.0') {
+        exclude group: 'org.jetbrains.kotlin'
+        exclude group: 'org.mockito'
+    }
 }

app/src/androidTest/java/by/yancheuski/githubusers/ExampleInstrumentedTest.kt

@@ -0,0 +1,22 @@
+package by.yancheuski.githubusers
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("by.yancheuski.githubusers", appContext.packageName)
+    }
+}

app/src/main/java/by/yancheuski/githubusers/view/details/UserContract.kt → app/src/main/java/by/yancheuski/githubusers/presenter/UserContract.kt

@@ -1,4 +1,4 @@
-package by.yancheuski.githubusers.view.details
+package by.yancheuski.githubusers.presenter
 
 import by.yancheuski.githubusers.domain.entities.UserEntity
 

app/src/main/java/by/yancheuski/githubusers/view/details/UserPresenter.kt → app/src/main/java/by/yancheuski/githubusers/presenter/UserPresenter.kt

@@ -1,4 +1,4 @@
-package by.yancheuski.githubusers.view.details
+package by.yancheuski.githubusers.presenter
 
 import by.yancheuski.githubusers.domain.repos.UsersRepo
 

app/src/main/java/by/yancheuski/githubusers/view/list/UsersContract.kt → app/src/main/java/by/yancheuski/githubusers/presenter/UsersContract.kt

@@ -1,4 +1,4 @@
-package by.yancheuski.githubusers.view.list
+package by.yancheuski.githubusers.presenter
 
 import by.yancheuski.githubusers.domain.entities.UserEntity
 

app/src/main/java/by/yancheuski/githubusers/view/list/UsersPresenter.kt → app/src/main/java/by/yancheuski/githubusers/presenter/UsersPresenter.kt

@@ -1,4 +1,4 @@
-package by.yancheuski.githubusers.view.list
+package by.yancheuski.githubusers.presenter
 
 import by.yancheuski.githubusers.domain.entities.UserEntity
 import by.yancheuski.githubusers.domain.repos.UsersRepo

app/src/main/java/by/yancheuski/githubusers/view/details/UserProfileActivity.kt

@@ -6,6 +6,8 @@ import androidx.appcompat.app.AppCompatActivity
 import by.yancheuski.githubusers.app
 import by.yancheuski.githubusers.databinding.ActivityUserProfileBinding
 import by.yancheuski.githubusers.domain.entities.UserEntity
+import by.yancheuski.githubusers.presenter.UserContract
+import by.yancheuski.githubusers.presenter.UserPresenter
 import coil.api.load
 
 const val USER_EXTRA_KEY = "USER_EXTRA_KEY"

app/src/main/java/by/yancheuski/githubusers/view/list/MainActivity.kt

@@ -9,6 +9,8 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import by.yancheuski.githubusers.app
 import by.yancheuski.githubusers.databinding.ActivityMainBinding
 import by.yancheuski.githubusers.domain.entities.UserEntity
+import by.yancheuski.githubusers.presenter.UsersContract
+import by.yancheuski.githubusers.presenter.UsersPresenter
 import by.yancheuski.githubusers.view.OnClickUserListener
 import by.yancheuski.githubusers.view.details.USER_EXTRA_KEY
 import by.yancheuski.githubusers.view.details.UserProfileActivity

app/src/test/java/by/yancheuski/githubusers/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package by.yancheuski.githubusers
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

app/src/test/java/by/yancheuski/githubusers/UserPresenterTest.kt

@@ -0,0 +1,84 @@
+package by.yancheuski.githubusers
+
+import by.yancheuski.githubusers.domain.entities.UserEntity
+import by.yancheuski.githubusers.domain.repos.UsersRepo
+import by.yancheuski.githubusers.presenter.UserContract
+import by.yancheuski.githubusers.presenter.UserPresenter
+import com.nhaarman.mockito_kotlin.any
+import com.nhaarman.mockito_kotlin.eq
+import com.nhaarman.mockito_kotlin.times
+import com.nhaarman.mockito_kotlin.verify
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.MockitoAnnotations
+
+class UserPresenterTest {
+
+    private lateinit var presenter: UserPresenter
+
+    @Mock
+    private lateinit var repo: UsersRepo
+
+    @Mock
+    private lateinit var viewContract: UserContract.View
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        presenter = UserPresenter(repo)
+    }
+
+    @Test
+    fun `should call repository when refreshing`() {
+        val expectedParameter = "username"
+
+        presenter.onRefresh(expectedParameter)
+
+        verify(repo, times(1))
+            .getUser(eq(expectedParameter), any(), any())
+    }
+
+    @Test
+    fun `should call view showUser when getting user with success`() {
+        val expectedUserEntity = UserEntity(
+            login = "pashtet",
+            id = 11,
+            avatarUrl = ""
+        )
+
+        `when`(repo.getUser(any(), any(), any()))
+            .thenAnswer {
+                @Suppress("UNCHECKED_CAST")
+                val arg = it.arguments[1] as ((user: UserEntity) -> Unit)
+                arg.invoke(expectedUserEntity)
+                return@thenAnswer null
+            }
+
+        presenter.attach(viewContract)
+        presenter.onRefresh("username")
+
+        verify(viewContract, times(1))
+            .showUser(eq(expectedUserEntity))
+    }
+
+    @Test
+    fun `should call view showError when getting user with error`() {
+        val expectedError = Throwable("This is sparta!")
+
+        `when`(repo.getUser(any(), any(), any()))
+            .thenAnswer {
+                @Suppress("UNCHECKED_CAST")
+                val arg = it.arguments[2] as ((Throwable) -> Unit)?
+                arg?.invoke(expectedError)
+                return@thenAnswer null
+            }
+
+        presenter.attach(viewContract)
+        presenter.onRefresh("username")
+
+        verify(viewContract, times(1))
+            .showError(eq(expectedError))
+    }
+}

app/src/test/java/by/yancheuski/githubusers/UsersPresenterTest.kt

@@ -0,0 +1,77 @@
+package by.yancheuski.githubusers
+
+import by.yancheuski.githubusers.domain.entities.UserEntity
+import by.yancheuski.githubusers.domain.repos.UsersRepo
+import by.yancheuski.githubusers.presenter.UsersContract
+import by.yancheuski.githubusers.presenter.UsersPresenter
+import com.nhaarman.mockito_kotlin.any
+import com.nhaarman.mockito_kotlin.eq
+import com.nhaarman.mockito_kotlin.times
+import com.nhaarman.mockito_kotlin.verify
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.MockitoAnnotations
+
+class UsersPresenterTest {
+
+    private lateinit var presenter: UsersPresenter
+
+    @Mock
+    private lateinit var repo: UsersRepo
+
+    @Mock
+    private lateinit var viewContract: UsersContract.View
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        presenter = UsersPresenter(repo)
+    }
+
+    @Test
+    fun `should call repository when refreshing`() {
+        presenter.onRefresh()
+
+        verify(repo, times(1)).getUsers(any(), any())
+    }
+
+    @Test
+    fun `should call view showUser when getting user with success`() {
+        val expectedListUsers = listOf<UserEntity>()
+
+        `when`(repo.getUsers(any(), any()))
+            .thenAnswer {
+                @Suppress("UNCHECKED_CAST")
+                val arg = it.arguments[0] as ((List<UserEntity>) -> Unit)
+                arg.invoke(expectedListUsers)
+                return@thenAnswer null
+            }
+
+        presenter.attach(viewContract)
+        presenter.onRefresh()
+
+        verify(viewContract, times(1))
+            .showUsers(expectedListUsers)
+    }
+
+    @Test
+    fun `should call view showError when getting user with error`() {
+        val expectedError = Throwable("This is sparta!")
+
+        `when`(repo.getUsers(any(), any()))
+            .thenAnswer {
+                @Suppress("UNCHECKED_CAST")
+                val arg = it.arguments[1] as ((Throwable) -> Unit)?
+                arg?.invoke(expectedError)
+                return@thenAnswer null
+            }
+
+        presenter.attach(viewContract)
+        presenter.onRefresh()
+
+        verify(viewContract, times(1))
+            .showError(eq(expectedError))
+    }
+}