Cache test

buildSrc/src/main/kotlin/AppConfig.kt

@@ -10,4 +10,6 @@ object AppConfig {
     const val versionCode: Int = 1
 
     const val versionName: String = "1.0"
-}
+
+    const val testInstrumentationRunner: String = "androidx.test.runner.AndroidJUnitRunner"
+}

buildSrc/src/main/kotlin/Library.kt

@@ -55,6 +55,11 @@ object Library {
 
     // Mockito
     const val mockito = "org.mockito.kotlin:mockito-kotlin:${Version.mockito}"
+
+    // AndroidXTest
+    const val androidXTest: String = "androidx.test.ext:junit:${Version.testExt}"
+    const val runner: String = "androidx.test:runner:${Version.runner}"
+    const val robolectric: String = "org.robolectric:robolectric:${Version.robolectric}"
 }
 
 object Project {

buildSrc/src/main/kotlin/Version.kt

@@ -33,6 +33,11 @@ object Version {
     // Mockito
     const val mockito: String = "3.2.0"
 
+    // AndroidXTest
+    const val testExt: String = "1.1.3"
+    const val robolectric: String = "4.5.1"
+    const val runner: String = "1.2.0"
+
     // ktlint
     const val ktlint: String = "0.42.1"
 }

buildSrc/src/main/kotlin/extensions/AndroidAppExtension.kt

@@ -22,6 +22,7 @@ private class AndroidAppExtension : ProjectExtension {
                 minSdk = AppConfig.minSdkVersion
                 versionCode(AppConfig.versionCode)
                 versionName(AppConfig.versionName)
+                testInstrumentationRunner = AppConfig.testInstrumentationRunner
             }
 
             buildTypes {

buildSrc/src/main/kotlin/plugin/AndroidLibraryPlugin.kt

@@ -25,19 +25,15 @@ class AndroidLibraryPlugin : BasePlugin() {
         get() = {
             implementation(
                 Library.daggerHiltAndroid,
-                Library.coroutines,
-                Library.room
+                Library.coroutines
             )
             testImplementation(
                 Library.junit,
                 Library.truth,
                 Library.mockito,
                 Library.coroutinesTest
             )
-            kapt(
-                Library.daggerHiltCompiler,
-                Library.roomCompiler
-            )
+            kapt(Library.daggerHiltCompiler)
         }
 
     override val extensions: Array<ProjectExtension>

cache/build.gradle.kts

@@ -1,3 +1,15 @@
 plugins {
     androidLib
 }
+
+dependencies {
+    implementation(Library.room)
+    kapt(Library.roomCompiler)
+
+    testImplementation(
+        Library.androidXTest,
+        Library.runner,
+        Library.androidXTest,
+        Library.robolectric
+    )
+}

cache/src/main/java/com/example/expenselogger/cache/dao/ExpenseDao.kt

@@ -2,24 +2,25 @@ package com.example.expenselogger.cache.dao
 
 import androidx.room.Dao
 import androidx.room.Insert
+import androidx.room.OnConflictStrategy
 import androidx.room.Query
 import androidx.room.Update
 import com.example.expenselogger.cache.entity.ExpenseEntity
 
 @Dao
 internal interface ExpenseDao {
-    @Insert
-    fun insertExpense(expense: ExpenseEntity)
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertExpense(expense: ExpenseEntity): Long
 
     @Update
-    fun updateExpense(expense: ExpenseEntity)
+    suspend fun updateExpense(expense: ExpenseEntity)
 
     @Query("SELECT * FROM expense WHERE id = :id")
-    fun getExpense(id: Long): ExpenseEntity
+    suspend fun getExpense(id: Long): ExpenseEntity?
 
     @Query("SELECT * FROM expense ORDER BY date ASC")
-    public fun getExpenses(): List<ExpenseEntity>
+    suspend fun getExpenses(): List<ExpenseEntity>
 
     @Query("DELETE FROM expense WHERE id = :id")
-    fun deleteExpense(id: Long)
+    suspend fun deleteExpense(id: Long)
 }

cache/src/main/java/com/example/expenselogger/cache/entity/ExpenseEntity.kt

@@ -6,9 +6,6 @@ import androidx.room.PrimaryKey
 
 @Entity(tableName = "expense")
 public data class ExpenseEntity(
-    @PrimaryKey(autoGenerate = true)
-    @ColumnInfo(name = "id")
-    val id: Long,
     @ColumnInfo(name = "name")
     val name: String,
     @ColumnInfo(name = "amount")
@@ -17,4 +14,8 @@ public data class ExpenseEntity(
     val date: Long,
     @ColumnInfo(name = "info")
     val info: String
-)
+) {
+    @PrimaryKey(autoGenerate = true)
+    @ColumnInfo(name = "id")
+    var id: Long = 0L
+}

cache/src/main/java/com/example/expenselogger/cache/repository/ExpenseRepository.kt

@@ -4,9 +4,9 @@ import com.example.expenselogger.cache.entity.ExpenseEntity
 
 public interface ExpenseRepository {
 
-    public fun insertExpense(expenseEntity: ExpenseEntity)
-    public fun updateExpense(expenseEntity: ExpenseEntity)
-    public fun getExpense(id: Long): ExpenseEntity?
-    public fun getExpenses(): List<ExpenseEntity>
-    public fun deleteExpense(id: Long)
+    public suspend fun insertExpense(expenseEntity: ExpenseEntity): Long
+    public suspend fun updateExpense(expenseEntity: ExpenseEntity)
+    public suspend fun getExpense(id: Long): ExpenseEntity?
+    public suspend fun getExpenses(): List<ExpenseEntity>
+    public suspend fun deleteExpense(id: Long)
 }

cache/src/main/java/com/example/expenselogger/cache/repository/ExpenseRepositoryImpl.kt

@@ -8,23 +8,21 @@ internal class ExpenseRepositoryImpl @Inject constructor(
     private val expenseDao: ExpenseDao
 ) : ExpenseRepository {
 
-    override fun insertExpense(expenseEntity: ExpenseEntity) {
-        expenseDao.insertExpense(expenseEntity)
-    }
+    override suspend fun insertExpense(
+        expenseEntity: ExpenseEntity
+    ): Long = expenseDao.insertExpense(expenseEntity)
 
-    override fun updateExpense(expenseEntity: ExpenseEntity) {
+    override suspend fun updateExpense(expenseEntity: ExpenseEntity) {
         expenseDao.updateExpense(expenseEntity)
     }
 
-    override fun getExpense(id: Long): ExpenseEntity? {
-        return expenseDao.getExpense(id)
-    }
+    override suspend fun getExpense(
+        id: Long
+    ): ExpenseEntity? = expenseDao.getExpense(id)
 
-    override fun getExpenses(): List<ExpenseEntity> {
-        return expenseDao.getExpenses()
-    }
+    override suspend fun getExpenses(): List<ExpenseEntity> = expenseDao.getExpenses()
 
-    override fun deleteExpense(id: Long) {
+    override suspend fun deleteExpense(id: Long) {
         expenseDao.deleteExpense(id)
     }
 }

cache/src/test/java/com/example/expenselogger/cache/entity/DummyData.kt

@@ -0,0 +1,13 @@
+package com.example.expenselogger.cache.entity
+
+import java.util.Date
+
+internal object DummyData {
+
+    val expenseEntity: ExpenseEntity = ExpenseEntity(
+        name = "Valentine outing",
+        amount = 13_500.00,
+        date = Date(1613311218000).time, // February 14th 2021
+        info = "Valentine outing with bae"
+    )
+}

cache/src/test/java/com/example/expenselogger/cache/repository/ExpenseRepositoryTest.kt

@@ -0,0 +1,62 @@
+package com.example.expenselogger.cache.repository
+
+import androidx.room.Room
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.example.expenselogger.cache.ExpenseDatabase
+import com.example.expenselogger.cache.entity.DummyData
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.runBlocking
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+internal class ExpenseRepositoryTest {
+
+    private lateinit var expenseRepository: ExpenseRepository
+    private lateinit var expenseDatabase: ExpenseDatabase
+
+    @Before
+    fun setup() {
+        expenseDatabase = Room.inMemoryDatabaseBuilder(
+            ApplicationProvider.getApplicationContext(),
+            ExpenseDatabase::class.java
+        ).allowMainThreadQueries().build()
+
+        expenseRepository = ExpenseRepositoryImpl(
+            expenseDatabase.expenseDao
+        )
+    }
+
+    @After
+    fun `tearDown()`() {
+        expenseDatabase.close()
+    }
+
+    @Test
+    fun `verify that insertExpense inserts Expense into database`(): Unit =
+        runBlocking {
+            val expenseEntity = DummyData.expenseEntity
+            val id = expenseRepository.insertExpense(expenseEntity)
+            val actual = expenseRepository.getExpense(id)
+            assertThat(actual).isEqualTo(expenseEntity)
+        }
+
+    @Test
+    fun `verify that getExpenses gets list of expenses`(): Unit = runBlocking {
+        val expense = DummyData.expenseEntity
+        expenseRepository.insertExpense(expense)
+        val actual = expenseRepository.getExpenses()
+        assertThat(actual).isEqualTo(listOf(expense))
+    }
+
+    @Test
+    fun `verify that getExpense gets an expense`(): Unit = runBlocking {
+        val expenseEntity = DummyData.expenseEntity
+        val id = expenseRepository.insertExpense(expenseEntity)
+        val actual = expenseRepository.getExpense(id)
+        assertThat(actual).isEqualTo(expenseEntity)
+    }
+}