more compiler warning fixups

src/test/java/com/oltpbenchmark/api/AbstractTestCase.java

@@ -175,6 +175,7 @@ private int findAvailablePort() throws IOException {
             }
 
             try (ServerSocket testSocket = new ServerSocket(port)) {
+                assert testSocket != null;
                 return port;
             } catch (BindException e) {
                 // This port is already in use. Continue to next port.

src/test/java/com/oltpbenchmark/benchmarks/auctionmark/TestAuctionMarkWorker.java

@@ -23,7 +23,6 @@
 
 import com.oltpbenchmark.api.AbstractTestWorker;
 import com.oltpbenchmark.api.Procedure;
-import com.oltpbenchmark.api.Worker;
 import com.oltpbenchmark.benchmarks.auctionmark.util.UserId;
 
 import java.io.IOException;
@@ -61,9 +60,9 @@ public void testUniqueSellers() throws Exception {
         Set<UserId> all_users = new HashSet<UserId>();
         Set<UserId> worker_users = new TreeSet<UserId>();
         Integer last_num_users = null;
-        for (Worker w : this.workers) {
-            AuctionMarkWorker worker = (AuctionMarkWorker) w;
+        for (var w : this.workers) {
             assertNotNull(w);
+            AuctionMarkWorker worker = (AuctionMarkWorker) w;
 
             // Get the uninitialized profile
             AuctionMarkProfile profile = worker.getProfile();

src/test/java/com/oltpbenchmark/benchmarks/auctionmark/util/TestUserId.java

@@ -17,7 +17,7 @@
 
 package com.oltpbenchmark.benchmarks.auctionmark.util;
 
-import static junit.framework.Assert.assertFalse;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;

src/test/java/com/oltpbenchmark/util/TestCollectionUtil.java

@@ -122,6 +122,7 @@ public void testPop() {
             expected[i] = rng.astring(1, 32);
         } // FOR
 
+        @SuppressWarnings("rawtypes")
         Collection<String>[] collections = new Collection[]{
                 CollectionUtil.addAll(new ListOrderedSet<String>(), expected),
                 CollectionUtil.addAll(new HashSet<String>(), expected),