Sort news resources by descending publish date, add NewsResourceDao tests

Change-Id: Ib783ed1f4e0ce83c5add82e561f50f89de4faac9

core-database/build.gradle

@@ -34,6 +34,8 @@ android {
         ksp {
             arg("room.schemaLocation", "$projectDir/schemas")
         }
+
+        testInstrumentationRunner "com.google.samples.apps.nowinandroid.core.testing.NiaTestRunner"
     }
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -56,4 +58,15 @@ dependencies {
 
     implementation libs.hilt.android
     kapt libs.hilt.compiler
+
+    androidTestImplementation project(':core-testing')
+
+    // androidx.test is forcing JUnit, 4.12. This forces it to use 4.13
+    configurations.configureEach {
+        resolutionStrategy {
+            force libs.junit4
+            // Temporary workaround for https://issuetracker.google.com/174733673
+            force 'org.objenesis:objenesis:2.6'
+        }
+    }
 }

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

@@ -0,0 +1,184 @@
+/*
+ * Copyright 2022 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.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.model.NewsResourceEntity
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceTopicCrossRef
+import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
+import com.google.samples.apps.nowinandroid.core.database.model.asExternalModel
+import com.google.samples.apps.nowinandroid.core.database.model.episodeEntityShell
+import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.runTest
+import kotlinx.datetime.Instant
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+
+class NewsResourceDaoTest {
+
+    private lateinit var newsResourceDao: NewsResourceDao
+    private lateinit var episodeDao: EpisodeDao
+    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()
+        episodeDao = db.episodeDao()
+        topicDao = db.topicDao()
+    }
+
+    @Test
+    fun newsResourceDao_fetches_items_by_descending_publish_date() = runTest {
+        val newsResourceEntities = listOf(
+            testNewsResource(
+                id = 0,
+                millisSinceEpoch = 0,
+            ),
+            testNewsResource(
+                id = 1,
+                millisSinceEpoch = 3,
+            ),
+            testNewsResource(
+                id = 2,
+                millisSinceEpoch = 1,
+            ),
+            testNewsResource(
+                id = 3,
+                millisSinceEpoch = 2,
+            ),
+        )
+        val episodeEntityShells = newsResourceEntities
+            .map(NewsResourceEntity::episodeEntityShell)
+            .distinct()
+
+        episodeDao.saveEpisodeEntities(
+            episodeEntityShells
+        )
+        newsResourceDao.saveNewsResourceEntities(
+            newsResourceEntities
+        )
+
+        val savedNewsResourceEntities = newsResourceDao.getNewsResourcesStream()
+            .first()
+
+        assertEquals(
+            listOf(3L, 2L, 1L, 0L),
+            savedNewsResourceEntities.map {
+                it.asExternalModel().publishDate.toEpochMilliseconds()
+            }
+        )
+    }
+
+    @Test
+    fun newsResourceDao_filters_items_by_topic_ids_by_descending_publish_date() = runTest {
+        val topicEntities = listOf(
+            testTopicEntity(
+                id = 1,
+                name = "1"
+            ),
+            testTopicEntity(
+                id = 2,
+                name = "2"
+            ),
+        )
+        val newsResourceEntities = listOf(
+            testNewsResource(
+                id = 0,
+                millisSinceEpoch = 0,
+            ),
+            testNewsResource(
+                id = 1,
+                millisSinceEpoch = 3,
+            ),
+            testNewsResource(
+                id = 2,
+                millisSinceEpoch = 1,
+            ),
+            testNewsResource(
+                id = 3,
+                millisSinceEpoch = 2,
+            ),
+        )
+        val episodeEntityShells = newsResourceEntities
+            .map(NewsResourceEntity::episodeEntityShell)
+            .distinct()
+        val newsResourceTopicCrossRefEntities = topicEntities.mapIndexed { index, topicEntity ->
+            NewsResourceTopicCrossRef(
+                newsResourceId = index,
+                topicId = topicEntity.id
+            )
+        }
+
+        topicDao.saveTopics(
+            topicEntities
+        )
+        episodeDao.saveEpisodeEntities(
+            episodeEntityShells
+        )
+        newsResourceDao.saveNewsResourceEntities(
+            newsResourceEntities
+        )
+        newsResourceDao.saveTopicCrossRefEntities(
+            newsResourceTopicCrossRefEntities
+        )
+
+        val filteredNewsResources = newsResourceDao.getNewsResourcesStream(
+            filterTopicIds = topicEntities
+                .map(TopicEntity::id)
+                .toSet()
+        ).first()
+
+        assertEquals(
+            listOf(1, 0),
+            filteredNewsResources.map { it.entity.id }
+        )
+    }
+}
+
+private fun testTopicEntity(
+    id: Int = 0,
+    name: String
+) = TopicEntity(
+    id = id,
+    name = name,
+    description = "",
+)
+
+private fun testNewsResource(
+    id: Int = 0,
+    millisSinceEpoch: Long = 0
+) = NewsResourceEntity(
+    id = id,
+    episodeId = 0,
+    title = "",
+    content = "",
+    url = "",
+    headerImageUrl = "",
+    publishDate = Instant.fromEpochMilliseconds(millisSinceEpoch),
+    type = NewsResourceType.DAC,
+)

core-database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/NewsResourceDao.kt

@@ -33,21 +33,21 @@ import kotlinx.coroutines.flow.Flow
 interface NewsResourceDao {
     @Query(
         value = """
-    SELECT * FROM news_resources
-    ORDER BY publish_date
+            SELECT * FROM news_resources
+            ORDER BY publish_date DESC
     """
     )
     fun getNewsResourcesStream(): Flow<List<PopulatedNewsResource>>
 
     @Query(
         value = """
-        SELECT * FROM news_resources
-        WHERE id in
-        (
-            SELECT news_resource_id FROM news_resources_topics
-            WHERE topic_id IN (:filterTopicIds)
-        )
-        ORDER BY publish_date
+            SELECT * FROM news_resources
+            WHERE id in
+            (
+                SELECT news_resource_id FROM news_resources_topics
+                WHERE topic_id IN (:filterTopicIds)
+            )
+            ORDER BY publish_date DESC
     """
     )
     fun getNewsResourcesStream(filterTopicIds: Set<Int>): Flow<List<PopulatedNewsResource>>