fredia commented on code in PR #22457:
URL: https://github.com/apache/flink/pull/22457#discussion_r1187096060


##########
flink-queryable-state/flink-queryable-state-runtime/src/test/java/org/apache/flink/queryablestate/network/KvStateClientHandlerTest.java:
##########
@@ -93,28 +92,66 @@ public void testReadCallbacksAndBufferRecycling() throws 
Exception {
 
         // Verify callback
         channel.writeInbound(buf);
-        verify(callback, times(1)).onFailure(isA(RuntimeException.class));
+        assertThat(TestClientHandlerCallback.onFailureCnt).isEqualTo(1);
+        
assertThat(TestClientHandlerCallback.onFailureBody).isInstanceOf(RuntimeException.class);
 
         //
         // Unexpected messages
         //
         buf = channel.alloc().buffer(4).writeInt(1223823);
 
         // Verify callback
+        TestClientHandlerCallback.onFailureCnt = 0;
         channel.writeInbound(buf);
-        verify(callback, times(1)).onFailure(isA(IllegalStateException.class));
-        assertEquals("Buffer not recycled", 0, buf.refCnt());
+        assertThat(TestClientHandlerCallback.onFailureCnt).isEqualTo(1);
+        
assertThat(TestClientHandlerCallback.onFailureBody).isInstanceOf(RuntimeException.class);
+        assertThat(buf.refCnt()).isEqualTo(0).withFailMessage("Buffer not 
recycled");
 
         //
         // Exception caught
         //
+        TestClientHandlerCallback.onFailureCnt = 0;
         channel.pipeline().fireExceptionCaught(new RuntimeException("Expected 
test Exception"));
-        verify(callback, times(3)).onFailure(isA(RuntimeException.class));
+        assertThat(TestClientHandlerCallback.onFailureCnt).isEqualTo(1);
+        
assertThat(TestClientHandlerCallback.onFailureBody).isInstanceOf(RuntimeException.class);
 
         //
         // Channel inactive
         //
+        TestClientHandlerCallback.onFailureCnt = 0;
         channel.pipeline().fireChannelInactive();
-        verify(callback, 
times(1)).onFailure(isA(ClosedChannelException.class));
+        assertThat(TestClientHandlerCallback.onFailureCnt).isEqualTo(1);
+        
assertThat(TestClientHandlerCallback.onFailureBody).isInstanceOf(ClosedChannelException.class);
+    }
+
+    private static class TestClientHandlerCallback implements 
ClientHandlerCallback {
+        private static int onRequestCnt;

Review Comment:
   For more convenient access to those fields from external classes, something 
like:
   ```Java
   assertThat(TestingClientHandlerCallback.onRequestCnt).isEqualTo(1);
   assertThat(TestingClientHandlerCallback.onRequestId).isEqualTo(1222112277L);
   
assertThat(TestingClientHandlerCallback.onRequestBody).isInstanceOf(KvStateResponse.class);
   ```



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