tests: remove redundant, clear compilation warnings

Author: mostroverkhov

netty-websocket-http2/src/test/java/com/jauntsdn/netty/handler/codec/http2/websocketx/AbstractTest.java

@@ -89,7 +89,7 @@ static SslContext serverSslContext(String keystoreFile, String keystorePassword)
     SslProvider sslProvider = sslProvider();
     KeyStore keyStore = KeyStore.getInstance("PKCS12");
     InputStream keystoreStream =
-        PingPongTest.class.getClassLoader().getResourceAsStream(keystoreFile);
+        AbstractTest.class.getClassLoader().getResourceAsStream(keystoreFile);
     char[] keystorePasswordArray = keystorePassword.toCharArray();
     keyStore.load(keystoreStream, keystorePasswordArray);
 

netty-websocket-http2/src/test/java/com/jauntsdn/netty/handler/codec/http2/websocketx/PingPongTest.java

@@ -363,7 +363,7 @@ public void channelInactive(ChannelHandlerContext ctx) throws Exception {
     }
 
     @Override
-    protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
+    protected void channelRead0(ChannelHandlerContext ctx, Object msg) {
       if (msg instanceof FullHttpResponse) {
         WebSocketClientHandshaker h = handshaker;
         if (h.isHandshakeComplete()) {
@@ -515,11 +515,9 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) {
     }
   }
 
-  static <T> Set<T> setOf(T... elems) {
-    Set<T> set = new HashSet<>(elems.length);
-    for (T elem : elems) {
-      set.add(elem);
-    }
+  static Set<String> setOf(String... elems) {
+    Set<String> set = new HashSet<>(elems.length);
+    Collections.addAll(set, elems);
     return set;
   }
 }