wangzzu commented on code in PR #23242:
URL: https://github.com/apache/flink/pull/23242#discussion_r1300073633


##########
flink-runtime/src/test/java/org/apache/flink/runtime/rest/RestExternalHandlersITCase.java:
##########
@@ -128,29 +124,27 @@ void teardown() throws Exception {
     void testHandlersMustBeLoaded() {
         final List<InboundChannelHandlerFactory> 
inboundChannelHandlerFactories =
                 serverEndpoint.getInboundChannelHandlerFactories();
-        assertEquals(inboundChannelHandlerFactories.size(), 2);
-        assertTrue(
-                inboundChannelHandlerFactories.get(0) instanceof 
Prio1InboundChannelHandlerFactory);
-        assertTrue(
-                inboundChannelHandlerFactories.get(1) instanceof 
Prio0InboundChannelHandlerFactory);
+        assertThat(inboundChannelHandlerFactories.size()).isEqualTo(2);
+        assertThat(inboundChannelHandlerFactories.get(0))
+                .isInstanceOf(Prio1InboundChannelHandlerFactory.class);
+        assertThat(inboundChannelHandlerFactories.get(1))
+                .isInstanceOf(Prio0InboundChannelHandlerFactory.class);
 
         final List<OutboundChannelHandlerFactory> 
outboundChannelHandlerFactories =
                 restClient.getOutboundChannelHandlerFactories();
-        assertEquals(outboundChannelHandlerFactories.size(), 2);
-        assertTrue(
-                outboundChannelHandlerFactories.get(0)
-                        instanceof Prio1OutboundChannelHandlerFactory);
-        assertTrue(
-                outboundChannelHandlerFactories.get(1)
-                        instanceof Prio0OutboundChannelHandlerFactory);
+        assertThat(outboundChannelHandlerFactories.size()).isEqualTo(2);
+        assertThat(outboundChannelHandlerFactories.get(0))
+                .isInstanceOf(Prio1OutboundChannelHandlerFactory.class);
+        assertThat(outboundChannelHandlerFactories.get(1))
+                .isInstanceOf(Prio0OutboundChannelHandlerFactory.class);
 
         try {
             final CompletableFuture<TestResponse> response =
                     sendRequestToTestHandler(new TestRequest());
             response.get();
             fail("Request must fail with 2 times redirected URL");
         } catch (Exception e) {
-            assertTrue(e.getMessage().contains(REDIRECT2_URL));
+            assertThat(e.getMessage()).contains(REDIRECT2_URL);
         }

Review Comment:
   fixed it



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