Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16686#discussion_r97657985
--- Diff:
external/kafka-0-10-sql/src/test/scala/org/apache/spark/sql/kafka010/KafkaRelationSuite.scala
---
@@ -0,0 +1,167 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.spark.sql.kafka010
+
+import java.util.concurrent.atomic.AtomicInteger
+
+import org.apache.kafka.common.TopicPartition
+import org.scalatest.BeforeAndAfter
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.test.SharedSQLContext
+
+class KafkaRelationSuite extends SparkFunSuite with BeforeAndAfter with
SharedSQLContext {
+
+ import testImplicits._
+
+ private val topicId = new AtomicInteger(0)
+
+ private var testUtils: KafkaTestUtils = _
+
+ private def newTopic(): String = s"topic-${topicId.getAndIncrement()}"
+
+ private def assignString(topic: String, partitions: Iterable[Int]):
String = {
+ JsonUtils.partitions(partitions.map(p => new TopicPartition(topic, p)))
+ }
+
+ override def beforeAll(): Unit = {
+ super.beforeAll()
+ testUtils = new KafkaTestUtils
+ testUtils.setup()
+ }
+
+ override def afterAll(): Unit = {
+ if (testUtils != null) {
+ testUtils.teardown()
+ testUtils = null
+ super.afterAll()
+ }
+ }
+
+ test("batch processing earliest to latest") {
+ val topic = newTopic()
+ testUtils.createTopic(topic, partitions = 3)
+ testUtils.sendMessages(topic, (0 to 9).map(_.toString).toArray,
Some(0))
+ testUtils.sendMessages(topic, (10 to 19).map(_.toString).toArray,
Some(1))
+ testUtils.sendMessages(topic, Array("20"), Some(2))
+
+ // Specify explicit earliest and latest offset values
+ var reader = spark
+ .read
+ .format("kafka")
+ .option("kafka.bootstrap.servers", testUtils.brokerAddress)
+ .option("subscribe", topic)
+ .option("startingOffsets", "earliest")
+ .option("endingOffsets", "latest")
+ .load()
+ assert(reader.count() === 21)
--- End diff --
You can extend QueryTest rather than SparkFunSuite to use `checkAnswer`
like this:
```Scala
var df = spark
.read
.format("kafka")
.option("kafka.bootstrap.servers", testUtils.brokerAddress)
.option("subscribe", topic)
.option("startingOffsets", "earliest")
.option("endingOffsets", "latest")
.load()
.selectExpr("CAST(value AS STRING)")
checkAnswer(df, (0 to 20).map(_.toString).toDF)
```
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