Add test

tempest2/src/test/kotlin/app/cash/tempest2/LogicalDbFailueTest.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2021 Square Inc.
+ *
+ * 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
+ *
+ * http://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 app.cash.tempest2
+
+import app.cash.tempest2.musiclibrary.AlbumTrack
+import app.cash.tempest2.musiclibrary.MusicDb
+import app.cash.tempest2.musiclibrary.PlaylistInfo
+import app.cash.tempest2.musiclibrary.testDb
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.RegisterExtension
+import java.time.Duration
+import software.amazon.awssdk.enhanced.dynamodb.DynamoDbEnhancedClient
+import software.amazon.awssdk.enhanced.dynamodb.Key
+import software.amazon.awssdk.enhanced.dynamodb.model.BatchWriteItemEnhancedRequest
+import software.amazon.awssdk.enhanced.dynamodb.model.BatchWriteResult
+import software.amazon.awssdk.services.dynamodb.model.DeleteRequest
+import software.amazon.awssdk.services.dynamodb.model.WriteRequest
+
+class LogicalDbFailueTest {
+
+  @RegisterExtension
+  @JvmField
+  val db = testDb()
+
+  // Fake client that prevents batch deletes from succeeding
+  class FakeDynamoDbEnhancedClient(private val realClient: DynamoDbEnhancedClient) :
+    DynamoDbEnhancedClient by realClient {
+    override fun batchWriteItem(request: BatchWriteItemEnhancedRequest?): BatchWriteResult {
+      val unprocessedDeletes = request!!.writeBatches().map { writeBatch ->
+        writeBatch.tableName() to writeBatch.writeRequests().map { writeRequest ->
+          val key = writeRequest.deleteRequest().key()
+          WriteRequest.builder()
+            .deleteRequest(
+              DeleteRequest.builder()
+                .key(key)
+                .build()
+            )
+            .build()
+        }
+      }
+
+      val results = unprocessedDeletes.associate { (tableName, keys) ->
+        tableName to keys
+      }
+      return BatchWriteResult.builder()
+        .unprocessedRequests(results)
+        .build()
+    }
+  }
+
+  private val musicDb by lazy {
+    val enhancedClient = DynamoDbEnhancedClient.builder()
+      .dynamoDbClient(db.dynamoDb)
+      .extensions(listOf())
+      .build()
+    val fakeEnhancedClient = FakeDynamoDbEnhancedClient(enhancedClient)
+    LogicalDb.create(MusicDb::class, fakeEnhancedClient)
+  }
+  private val musicTable by lazy { musicDb.music }
+
+  @Test
+  fun `batch write handles unprocessed deletes accurately`() {
+    val albumTracks = listOf(
+      AlbumTrack("ALBUM_1", 1, "dreamin'", Duration.parse("PT3M28S")),
+      AlbumTrack("ALBUM_1", 2, "what you do to me", Duration.parse("PT3M24S")),
+      AlbumTrack("ALBUM_1", 3, "too slow", Duration.parse("PT2M27S"))
+    )
+    for (albumTrack in albumTracks) {
+      musicTable.albumTracks.save(albumTrack)
+    }
+
+    val batchWriteResult = musicDb.batchWrite(
+      BatchWriteSet.Builder()
+        .delete(albumTracks.map { it.key })
+        .build()
+    )
+
+    assertThat(batchWriteResult.unprocessedDeletes.map { it.partitionKeyValue().s() to it.sortKeyValue().get().s() })
+      .containsExactlyInAnyOrderElementsOf(
+        albumTracks.map {
+          it.album_token to "TRACK_${it.track_token}"
+        }
+      )
+  }
+}