[JAVA-9839] Cleanup test files

apache-spark/src/test/java/com/baeldung/differences/rdd/TransformationsUnitTest.java

@@ -1,9 +1,9 @@
 package com.baeldung.differences.rdd;
 
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaRDD;
@@ -12,9 +12,12 @@ import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
+import java.io.File;
+
 public class TransformationsUnitTest {
 
     public static final String COMMA_DELIMITER = ",(?=([^\"]*\"[^\"]*\")*[^\"]*$)";
+
     private static JavaSparkContext sc;
     private static JavaRDD<String> tourists;
 
@@ -25,6 +28,9 @@ public class TransformationsUnitTest {
         sc = new JavaSparkContext(conf);
         tourists = sc.textFile("data/Tourist.csv")
             .filter(line -> !line.startsWith("Region")); //filter header row
+
+        // delete previous output dir and files
+        FileUtils.deleteQuietly(new File("data/output"));
     }
 
     @AfterClass