Testing Repositories

app/src/test/java/com/ericampire/android/androidstudycase/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package com.ericampire.android.androidstudycase
-
-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/com/ericampire/android/androidstudycase/common/CoroutineDispatcherExtension.kt

@@ -0,0 +1,25 @@
+package com.ericampire.android.androidstudycase.common
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import org.junit.jupiter.api.extension.ExtensionContext
+import org.junit.jupiter.api.extension.ParameterContext
+import org.junit.jupiter.api.extension.ParameterResolver
+
+@ExperimentalCoroutinesApi
+class CoroutineDispatcherExtension : ParameterResolver {
+
+  override fun supportsParameter(
+    parameterContext: ParameterContext,
+    extensionContext: ExtensionContext?
+  ): Boolean {
+    return parameterContext.parameter.type.equals(TestCoroutineDispatcher::class.java)
+  }
+
+  override fun resolveParameter(
+    parameterContext: ParameterContext?,
+    extensionContext: ExtensionContext?
+  ): Any {
+    return TestCoroutineDispatcher()
+  }
+}

app/src/test/java/com/ericampire/android/androidstudycase/common/CoroutineScopeExtension.kt

@@ -0,0 +1,24 @@
+package com.ericampire.android.androidstudycase.common
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestCoroutineScope
+import org.junit.jupiter.api.extension.ExtensionContext
+import org.junit.jupiter.api.extension.ParameterContext
+import org.junit.jupiter.api.extension.ParameterResolver
+
+@ExperimentalCoroutinesApi
+class CoroutineScopeExtension : ParameterResolver {
+  override fun supportsParameter(
+    parameterContext: ParameterContext,
+    extensionContext: ExtensionContext?
+  ): Boolean {
+    return parameterContext.parameter.type.equals(TestCoroutineScope::class.java)
+  }
+
+  override fun resolveParameter(
+    parameterContext: ParameterContext?,
+    extensionContext: ExtensionContext?
+  ): Any {
+    return TestCoroutineScope()
+  }
+}

app/src/test/java/com/ericampire/android/androidstudycase/common/MainCoroutineExtension.kt

@@ -0,0 +1,25 @@
+package com.ericampire.android.androidstudycase.common
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.jupiter.api.extension.AfterAllCallback
+import org.junit.jupiter.api.extension.BeforeAllCallback
+import org.junit.jupiter.api.extension.ExtensionContext
+
+@ExperimentalCoroutinesApi
+class MainCoroutineExtension : BeforeAllCallback, AfterAllCallback {
+
+  private val testDispatcher: TestCoroutineDispatcher = TestCoroutineDispatcher()
+
+  override fun beforeAll(context: ExtensionContext?) {
+    Dispatchers.setMain(testDispatcher)
+  }
+
+  override fun afterAll(context: ExtensionContext?) {
+    Dispatchers.resetMain()
+    testDispatcher.cleanupTestCoroutines()
+  }
+}

app/src/test/java/com/ericampire/android/androidstudycase/data/repository/AnimatorRepositoryTest.kt

@@ -61,8 +61,8 @@ class AnimatorRepositoryTest(
       assertEquals(it.data, PreviewData.Animator.data)
     }
 
-    coVerify {
-      remoteDataSource.findAll()
+    verify(exactly = 1) { remoteDataSource.findAll() }
+    coVerify(exactly = PreviewData.Animator.data.size) {
       localDataSource.save(any())
     }
   }

app/src/test/java/com/ericampire/android/androidstudycase/data/repository/BlogRepositoryTest.kt

@@ -0,0 +1,68 @@
+package com.ericampire.android.androidstudycase.data.repository
+
+import com.ericampire.android.androidstudycase.common.CoroutineDispatcherExtension
+import com.ericampire.android.androidstudycase.common.CoroutineScopeExtension
+import com.ericampire.android.androidstudycase.common.MainCoroutineExtension
+import com.ericampire.android.androidstudycase.data.datasource.blog.BlogDataSource
+import com.ericampire.android.androidstudycase.util.PreviewData
+import com.ericampire.android.androidstudycase.util.Result
+import com.ericampire.android.androidstudycase.util.data
+import io.mockk.*
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import kotlinx.coroutines.test.TestCoroutineScope
+import kotlinx.coroutines.test.runBlockingTest
+import org.junit.Assert
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import kotlin.time.ExperimentalTime
+
+@ExperimentalCoroutinesApi
+@ExtendWith(
+  value = [
+    MainCoroutineExtension::class,
+    CoroutineDispatcherExtension::class,
+    CoroutineScopeExtension::class
+  ]
+)
+class BlogRepositoryTest(
+  private val coroutineScope: TestCoroutineScope,
+  private val dispatcher: TestCoroutineDispatcher
+) {
+
+  // SUT
+  private lateinit var blogRepository: BlogRepositoryImpl
+
+  // DOC's
+  private val remoteDataSource = mockk<BlogDataSource>(relaxed = true)
+  private val localDataSource = mockk<BlogDataSource>(relaxed = true)
+
+  @BeforeEach
+  fun setup() {
+    blogRepository = BlogRepositoryImpl(
+      remoteDataSource = remoteDataSource,
+      localDataSource = localDataSource,
+      coroutineScope = coroutineScope,
+      coroutineDispatcher = dispatcher
+    )
+  }
+
+  @ExperimentalTime
+  @Test
+  fun findingAllStories() = runBlockingTest {
+    every { remoteDataSource.findAll() } returns flowOf(Result.Success(PreviewData.Blog.data))
+    coEvery { localDataSource.save(any()) } just Runs
+
+    blogRepository.findAll().collect {
+      Assert.assertEquals(it.data, PreviewData.Blog.data)
+    }
+
+    verify(exactly = 1) { remoteDataSource.findAll() }
+    coVerify(exactly = PreviewData.Blog.data.size) {
+      localDataSource.save(any())
+    }
+  }
+}

app/src/test/java/com/ericampire/android/androidstudycase/data/repository/LottieFileRepositoryTest.kt

@@ -0,0 +1,100 @@
+package com.ericampire.android.androidstudycase.data.repository
+
+import com.ericampire.android.androidstudycase.common.CoroutineDispatcherExtension
+import com.ericampire.android.androidstudycase.common.CoroutineScopeExtension
+import com.ericampire.android.androidstudycase.common.MainCoroutineExtension
+import com.ericampire.android.androidstudycase.data.datasource.lottiefiles.LottieFileDataSource
+import com.ericampire.android.androidstudycase.util.PreviewData
+import com.ericampire.android.androidstudycase.util.Result
+import com.ericampire.android.androidstudycase.util.data
+import io.mockk.*
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import kotlinx.coroutines.test.TestCoroutineScope
+import kotlinx.coroutines.test.runBlockingTest
+import org.junit.Assert
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import kotlin.time.ExperimentalTime
+
+@ExperimentalCoroutinesApi
+@ExtendWith(
+  value = [
+    MainCoroutineExtension::class,
+    CoroutineDispatcherExtension::class,
+    CoroutineScopeExtension::class
+  ]
+)
+class LottieFileRepositoryTest(
+  private val coroutineScope: TestCoroutineScope,
+  private val dispatcher: TestCoroutineDispatcher
+) {
+
+  // SUT
+  private lateinit var repository: LottieFileRepositoryImpl
+
+  // DOC's
+  private val remoteDataSource = mockk<LottieFileDataSource>(relaxed = true)
+  private val localDataSource = mockk<LottieFileDataSource>(relaxed = true)
+
+  @BeforeEach
+  fun setup() {
+    repository = LottieFileRepositoryImpl(
+      remoteDataSource = remoteDataSource,
+      localDataSource = localDataSource,
+      coroutineScope = coroutineScope,
+      coroutineDispatcher = dispatcher
+    )
+  }
+
+  @ExperimentalTime
+  @Test
+  fun findingFeaturedAnimation() = runBlockingTest {
+    every { remoteDataSource.findFeatured() } returns flowOf(Result.Success(PreviewData.Lottiefile.data))
+    coEvery { localDataSource.save(any()) } just Runs
+
+    repository.findFeatured().collect {
+      Assert.assertEquals(it.data, PreviewData.Lottiefile.data)
+    }
+
+    verify(exactly = 1) { remoteDataSource.findFeatured() }
+    coVerify(exactly = PreviewData.Lottiefile.data.size) {
+      localDataSource.save(any())
+    }
+  }
+
+  @ExperimentalTime
+  @Test
+  fun findingRecentAnimation() = runBlockingTest {
+    every { remoteDataSource.findRecent() } returns flowOf(Result.Success(PreviewData.Lottiefile.data))
+    coEvery { localDataSource.save(any()) } just Runs
+
+    repository.findRecent().collect {
+      Assert.assertEquals(it.data, PreviewData.Lottiefile.data)
+    }
+
+    verify(exactly = 1) { remoteDataSource.findRecent() }
+    coVerify(exactly = PreviewData.Lottiefile.data.size) {
+      localDataSource.save(any())
+    }
+  }
+
+  @ExperimentalTime
+  @Test
+  fun findingPopularAnimation() = runBlockingTest {
+    every { remoteDataSource.findPopular() } returns flowOf(Result.Success(PreviewData.Lottiefile.data))
+    coEvery { localDataSource.save(any()) } just Runs
+
+    repository.findPopular().collect {
+      Assert.assertEquals(it.data, PreviewData.Lottiefile.data)
+    }
+
+    verify(exactly = 1) { remoteDataSource.findPopular() }
+    coVerify(exactly = PreviewData.Lottiefile.data.size) {
+      localDataSource.save(any())
+    }
+  }
+}

app/src/test/java/com/ericampire/android/androidstudycase/data/repository/UserRepositoryTest.kt

@@ -0,0 +1,66 @@
+package com.ericampire.android.androidstudycase.data.repository
+
+import com.ericampire.android.androidstudycase.common.CoroutineDispatcherExtension
+import com.ericampire.android.androidstudycase.common.CoroutineScopeExtension
+import com.ericampire.android.androidstudycase.common.MainCoroutineExtension
+import com.ericampire.android.androidstudycase.data.datasource.user.UserDataSource
+import com.ericampire.android.androidstudycase.util.PreviewData
+import com.ericampire.android.androidstudycase.util.Result
+import com.ericampire.android.androidstudycase.util.data
+import io.mockk.*
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.test.TestCoroutineDispatcher
+import kotlinx.coroutines.test.TestCoroutineScope
+import kotlinx.coroutines.test.runBlockingTest
+import org.junit.Assert
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+
+@ExperimentalCoroutinesApi
+@ExtendWith(
+  value = [
+    MainCoroutineExtension::class,
+    CoroutineDispatcherExtension::class,
+    CoroutineScopeExtension::class
+  ]
+)
+class UserRepositoryTest(
+  private val coroutineScope: TestCoroutineScope,
+  private val dispatcher: TestCoroutineDispatcher
+) {
+  // SUT
+  private lateinit var repository: UserRepositoryImpl
+
+  // DOC's
+  private val localDataSource = mockk<UserDataSource>(relaxed = true)
+
+  @BeforeEach
+  fun setup() {
+    repository = UserRepositoryImpl(localDataSource)
+  }
+
+  @Test
+  fun findCurrentUser() = runBlockingTest {
+    every { localDataSource.findAll() } returns flowOf(Result.Success(PreviewData.User.data))
+
+    repository.findAll().collect {
+      Assert.assertEquals(it.data, PreviewData.User.data)
+    }
+
+    verify(exactly = 1) { localDataSource.findAll() }
+  }
+
+  @Test
+  fun saveUser() = runBlockingTest {
+    coEvery { localDataSource.save(PreviewData.User.data.first()) } just Runs
+
+    repository.save(PreviewData.User.data.first())
+
+    coVerify(exactly = 1) {
+      localDataSource.save(PreviewData.User.data.first())
+    }
+  }
+}