nizhikov commented on a change in pull request #8695:
URL: https://github.com/apache/kafka/pull/8695#discussion_r433265356



##########
File path: 
clients/src/test/java/org/apache/kafka/common/network/SslVersionsTransportLayerTest.java
##########
@@ -54,21 +54,16 @@
         List<Object[]> values = new ArrayList<>();
         values.add(new Object[] {Collections.singletonList("TLSv1.2"), 
Collections.singletonList("TLSv1.2")});
         if (Java.IS_JAVA11_COMPATIBLE) {
-            values.add(new Object[] {Collections.singletonList("TLSv1.2"), 
Collections.singletonList("TLSv1.3")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.3"), 
Collections.singletonList("TLSv1.2")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.3"), 
Collections.singletonList("TLSv1.3")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.2"), 
Arrays.asList("TLSv1.2", "TLSv1.3")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.3"), 
Arrays.asList("TLSv1.2", "TLSv1.3")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.2"), 
Arrays.asList("TLSv1.3", "TLSv1.2")});
-            values.add(new Object[] {Collections.singletonList("TLSv1.3"), 
Arrays.asList("TLSv1.3", "TLSv1.2")});
             values.add(new Object[] {Arrays.asList("TLSv1.2", "TLSv1.3"), 
Collections.singletonList("TLSv1.3")});
             values.add(new Object[] {Arrays.asList("TLSv1.2", "TLSv1.3"), 
Collections.singletonList("TLSv1.2")});
-            values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Collections.singletonList("TLSv1.3")});
-            values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Collections.singletonList("TLSv1.2")});
             values.add(new Object[] {Arrays.asList("TLSv1.2", "TLSv1.3"), 
Arrays.asList("TLSv1.2", "TLSv1.3")});
             values.add(new Object[] {Arrays.asList("TLSv1.2", "TLSv1.3"), 
Arrays.asList("TLSv1.3", "TLSv1.2")});
+
+            values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Collections.singletonList("TLSv1.3")});
+            values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Collections.singletonList("TLSv1.2")});
             values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Arrays.asList("TLSv1.2", "TLSv1.3")});
             values.add(new Object[] {Arrays.asList("TLSv1.3", "TLSv1.2"), 
Arrays.asList("TLSv1.3", "TLSv1.2")});
+

Review comment:
       Actually, test fails for a single case:
   For now, I have no idea why this happen :)
   I need some time to dig into details and explain results.
   Anyway, I revert the test with all possible combinations(that will fail).
   
   ```
   values.add(new Object[] {Collections.singletonList("TLSv1.3"), 
Arrays.asList("TLSv1.2", "TLSv1.3")});
   ```
   This means:
   ```
   #server config
   ssl.protocol=TLSv1.3
   ssl.enabled.protocols=TLSv1.3
   
   #client config
   ssl.protocol=TLSv1.2
   ssl.enabled.protocols=TLSv1.2,TLSv1.3
   ```




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