在用java开发时,通过用Junit框架来测试,在用spark开发scala时,除了可以用Junit,还可以用AnyFunSuite,无需依赖AnyFunSuite。
步骤一:设置项目依赖
确保您的项目中包含了以下必要的依赖:
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.4.0</version>
</dependency>
org.apache.spark
spark-core_2.11
2.4.0
test
<!-- ScalaTest 依赖 -->
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest_2.11</artifactId>
<version>3.2.9</version>
<scope>test</scope>
</dependency>
步骤二、编写单元测试
例如下面wordcount的代码
import org.apache.spark.sql.SparkSession
object WordCount {
def wordCount(input: String): Long = {
val spark = SparkSession.builder().appName(“WordCount”).master(“local[*]”).getOrCreate()
val words = spark.sparkContext.parallelize(input.split(” “))
val count = words.count()
spark.stop()
count
}
}
编写单元测试的代码:
import org.scalatest.funsuite.AnyFunSuite
class WordCountTest extends AnyFunSuite {
test(“wordCount should return correct word count”) {
val input = “Hello world, hello Scala”
val expectedResult = 5
val result = WordCount.wordCount(input)
assert(result == expectedResult)
}
}
步骤三:运行单元测试
在 IDEA 中右键点击测试类名或测试方法名,选择 “Run WordCountTest” 或 “Run ‘wordCount should return correct word count'” 来运行单元测试。您也可以点击绿色的三角形按钮执行所有测试用例。
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