extract common db setup

core/database/src/androidTest/kotlin/com/google/samples/apps/nowinandroid/core/database/TestDatabaseSetup.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid.core.database
+
+import android.content.Context
+import androidx.room.Room
+import androidx.test.core.app.ApplicationProvider
+import com.google.samples.apps.nowinandroid.core.database.dao.NewsResourceDao
+import com.google.samples.apps.nowinandroid.core.database.dao.TopicDao
+import org.junit.After
+import org.junit.Before
+
+abstract class TestDatabaseSetup {
+    protected lateinit var newsResourceDao: NewsResourceDao
+    protected lateinit var topicDao: TopicDao
+    private lateinit var db: NiaDatabase
+
+    @Before
+    fun createDb() {
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        db = Room.inMemoryDatabaseBuilder(
+            context,
+            NiaDatabase::class.java,
+        ).build()
+        newsResourceDao = db.newsResourceDao()
+        topicDao = db.topicDao()
+    }
+
+    @After
+    fun closeDb() = db.close()
+}

core/database/src/androidTest/kotlin/com/google/samples/apps/nowinandroid/core/database/dao/NewsResourceDaoTest.kt

@@ -16,10 +16,7 @@
 
 package com.google.samples.apps.nowinandroid.core.database.dao
 
-import android.content.Context
-import androidx.room.Room
-import androidx.test.core.app.ApplicationProvider
-import com.google.samples.apps.nowinandroid.core.database.NiaDatabase
+import com.google.samples.apps.nowinandroid.core.database.TestDatabaseSetup
 import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceEntity
 import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceTopicCrossRef
 import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
@@ -27,31 +24,10 @@ import com.google.samples.apps.nowinandroid.core.database.model.asExternalModel
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
 import kotlinx.datetime.Instant
-import org.junit.After
-import org.junit.Before
 import org.junit.Test
 import kotlin.test.assertEquals
 
-class NewsResourceDaoTest {
-
-    private lateinit var newsResourceDao: NewsResourceDao
-    private lateinit var topicDao: TopicDao
-    private lateinit var db: NiaDatabase
-
-    @Before
-    fun createDb() {
-        val context = ApplicationProvider.getApplicationContext<Context>()
-        db = Room.inMemoryDatabaseBuilder(
-            context,
-            NiaDatabase::class.java,
-        ).build()
-        newsResourceDao = db.newsResourceDao()
-        topicDao = db.topicDao()
-    }
-
-    @After
-    fun closeDb() = db.close()
-
+class NewsResourceDaoTest : TestDatabaseSetup() {
     @Test
     fun newsResourceDao_fetches_items_by_descending_publish_date() = runTest {
         val newsResourceEntities = listOf(

core/database/src/androidTest/kotlin/com/google/samples/apps/nowinandroid/core/database/dao/TopicDaoTest.kt

@@ -16,35 +16,14 @@
 
 package com.google.samples.apps.nowinandroid.core.database.dao
 
-import android.content.Context
-import androidx.room.Room
-import androidx.test.core.app.ApplicationProvider
-import com.google.samples.apps.nowinandroid.core.database.NiaDatabase
+import com.google.samples.apps.nowinandroid.core.database.TestDatabaseSetup
 import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
-import org.junit.After
-import org.junit.Before
 import org.junit.Test
 import kotlin.test.assertEquals
 
-class TopicDaoTest {
-    private lateinit var topicDao: TopicDao
-    private lateinit var db: NiaDatabase
-
-    @Before
-    fun createDb() {
-        val context = ApplicationProvider.getApplicationContext<Context>()
-        db = Room.inMemoryDatabaseBuilder(
-            context,
-            NiaDatabase::class.java,
-        ).build()
-        topicDao = db.topicDao()
-    }
-
-    @After
-    fun closeDb() = db.close()
-
+class TopicDaoTest : TestDatabaseSetup() {
     @Test
     fun topicDao_fetchTopics() = runTest {
         insertTopics()