HDFS-17278. Fix order dependent flakiness in TestViewfsWithNfs3.java under hadoop-hdfs-nfs module (#6329). Contributed by Ruby.

Reviewed-by: Xing Lin <linxingnku@gmail.com>
Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>

hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestDFSClientCache.java

@@ -30,9 +30,15 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.junit.After;
 import org.junit.Test;
 
 public class TestDFSClientCache {
+  @After
+  public void cleanup() {
+    UserGroupInformation.reset();
+  }
+
   @Test
   public void testEviction() throws IOException {
     NfsConfiguration conf = new NfsConfiguration();