chia7712 commented on code in PR #21387:
URL: https://github.com/apache/kafka/pull/21387#discussion_r2765974543


##########
clients/src/test/java/org/apache/kafka/common/config/ConfigDefTest.java:
##########
@@ -616,7 +616,10 @@ public void testConvertValueToStringLong() {
 
     @Test
     public void testConvertValueToStringDouble() {
-        assertEquals("3.125", ConfigDef.convertToString(3.125, Type.DOUBLE));
+        assertEquals("3.125", ConfigDef.convertToString(3.125d, Type.DOUBLE));
+        assertEquals("1.7976931348623157E308", 
ConfigDef.convertToString(Double.MAX_VALUE, Type.DOUBLE));
+        assertEquals("1.024E8",  ConfigDef.convertToString(102400000d, 
Type.DOUBLE));
+        assertEquals("-1.024E8",  ConfigDef.convertToString(-102400000d, 
Type.DOUBLE));
         assertNull(ConfigDef.convertToString(null, Type.DOUBLE));

Review Comment:
   > I wonder if we should start a task, like our move from Scala to Java,
   
   That's a good idea. Good documentation helps AI provide better answer to 
Kafka users. Do you intend to open the ticket? Or we can take it over if you 
don't have enough bandwidth 



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