Fix some warnings in the test code

Author: sungshik

src/test/java/engineering/swat/watch/TortureTests.java

@@ -39,7 +39,6 @@
 import java.util.Collections;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.LinkedBlockingDeque;
@@ -56,8 +55,6 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
 
-import engineering.swat.watch.WatchEvent.Kind;
-
 class TortureTests {
 
     private final Logger logger = LogManager.getLogger();
@@ -70,7 +67,7 @@ void setup() throws IOException {
     }
 
     @AfterEach
-    void cleanup() throws IOException {
+    void cleanup() {
         if (testDir != null) {
             testDir.close();
         }
@@ -90,7 +87,7 @@ private final class IOGenerator {
             }
         }
 
-        private final static int BURST_SIZE = 1000;
+        private static final int BURST_SIZE = 1000;
 
         private void startJob(final Path root, Random r, Executor exec) {
             exec.execute(() -> {