DL1231 commented on code in PR #20248:
URL: https://github.com/apache/kafka/pull/20248#discussion_r2300270790


##########
server-common/src/test/java/org/apache/kafka/server/common/MetadataVersionTest.java:
##########
@@ -42,55 +43,65 @@ public void testFeatureLevels() {
     @SuppressWarnings("checkstyle:JavaNCSS")
     public void testFromVersionString() {
         // 3.3-IV3 is the latest production version in the 3.3 line
-        assertEquals(IBP_3_3_IV3, MetadataVersion.fromVersionString("3.3"));
-        assertEquals(IBP_3_3_IV3, 
MetadataVersion.fromVersionString("3.3-IV3"));
+        assertEquals(IBP_3_3_IV3, MetadataVersion.fromVersionString("3.3", 
true));
+        assertEquals(IBP_3_3_IV3, MetadataVersion.fromVersionString("3.3-IV3", 
true));
 
         // 3.4-IV0 is the latest production version in the 3.4 line
-        assertEquals(IBP_3_4_IV0, MetadataVersion.fromVersionString("3.4"));
-        assertEquals(IBP_3_4_IV0, 
MetadataVersion.fromVersionString("3.4-IV0"));
+        assertEquals(IBP_3_4_IV0, MetadataVersion.fromVersionString("3.4", 
true));
+        assertEquals(IBP_3_4_IV0, MetadataVersion.fromVersionString("3.4-IV0", 
true));
 
         // 3.5-IV2 is the latest production version in the 3.5 line
-        assertEquals(IBP_3_5_IV2, MetadataVersion.fromVersionString("3.5"));
-        assertEquals(IBP_3_5_IV0, 
MetadataVersion.fromVersionString("3.5-IV0"));
-        assertEquals(IBP_3_5_IV1, 
MetadataVersion.fromVersionString("3.5-IV1"));
-        assertEquals(IBP_3_5_IV2, 
MetadataVersion.fromVersionString("3.5-IV2"));
+        assertEquals(IBP_3_5_IV2, MetadataVersion.fromVersionString("3.5", 
true));
+        assertEquals(IBP_3_5_IV0, MetadataVersion.fromVersionString("3.5-IV0", 
true));
+        assertEquals(IBP_3_5_IV1, MetadataVersion.fromVersionString("3.5-IV1", 
true));
+        assertEquals(IBP_3_5_IV2, MetadataVersion.fromVersionString("3.5-IV2", 
true));
 
         // 3.6-IV2 is the latest production version in the 3.6 line
-        assertEquals(IBP_3_6_IV2, MetadataVersion.fromVersionString("3.6"));
-        assertEquals(IBP_3_6_IV0, 
MetadataVersion.fromVersionString("3.6-IV0"));
-        assertEquals(IBP_3_6_IV1, 
MetadataVersion.fromVersionString("3.6-IV1"));
-        assertEquals(IBP_3_6_IV2, 
MetadataVersion.fromVersionString("3.6-IV2"));
+        assertEquals(IBP_3_6_IV2, MetadataVersion.fromVersionString("3.6", 
true));
+        assertEquals(IBP_3_6_IV0, MetadataVersion.fromVersionString("3.6-IV0", 
true));
+        assertEquals(IBP_3_6_IV1, MetadataVersion.fromVersionString("3.6-IV1", 
true));
+        assertEquals(IBP_3_6_IV2, MetadataVersion.fromVersionString("3.6-IV2", 
true));
 
         // 3.7-IV4 is the latest production version in the 3.7 line
-        assertEquals(IBP_3_7_IV4, MetadataVersion.fromVersionString("3.7"));
-        assertEquals(IBP_3_7_IV0, 
MetadataVersion.fromVersionString("3.7-IV0"));
-        assertEquals(IBP_3_7_IV1, 
MetadataVersion.fromVersionString("3.7-IV1"));
-        assertEquals(IBP_3_7_IV2, 
MetadataVersion.fromVersionString("3.7-IV2"));
-        assertEquals(IBP_3_7_IV3, 
MetadataVersion.fromVersionString("3.7-IV3"));
-        assertEquals(IBP_3_7_IV4, 
MetadataVersion.fromVersionString("3.7-IV4"));
+        assertEquals(IBP_3_7_IV4, MetadataVersion.fromVersionString("3.7", 
true));
+        assertEquals(IBP_3_7_IV0, MetadataVersion.fromVersionString("3.7-IV0", 
true));
+        assertEquals(IBP_3_7_IV1, MetadataVersion.fromVersionString("3.7-IV1", 
true));
+        assertEquals(IBP_3_7_IV2, MetadataVersion.fromVersionString("3.7-IV2", 
true));
+        assertEquals(IBP_3_7_IV3, MetadataVersion.fromVersionString("3.7-IV3", 
true));
+        assertEquals(IBP_3_7_IV4, MetadataVersion.fromVersionString("3.7-IV4", 
true));
 
         // 3.8-IV0 is the latest production version in the 3.8 line
-        assertEquals(IBP_3_8_IV0, MetadataVersion.fromVersionString("3.8"));
-        assertEquals(IBP_3_8_IV0, 
MetadataVersion.fromVersionString("3.8-IV0"));
+        assertEquals(IBP_3_8_IV0, MetadataVersion.fromVersionString("3.8", 
true));
+        assertEquals(IBP_3_8_IV0, MetadataVersion.fromVersionString("3.8-IV0", 
true));
 
         // 3.9-IV0 is the latest production version in the 3.9 line
-        assertEquals(IBP_3_9_IV0, MetadataVersion.fromVersionString("3.9"));
-        assertEquals(IBP_3_9_IV0, 
MetadataVersion.fromVersionString("3.9-IV0"));
+        assertEquals(IBP_3_9_IV0, MetadataVersion.fromVersionString("3.9", 
true));
+        assertEquals(IBP_3_9_IV0, MetadataVersion.fromVersionString("3.9-IV0", 
true));
 
         // 4.0-IV3 is the latest production version in the 4.0 line
-        assertEquals(IBP_4_0_IV3, MetadataVersion.fromVersionString("4.0"));
-        assertEquals(IBP_4_0_IV0, 
MetadataVersion.fromVersionString("4.0-IV0"));
-        assertEquals(IBP_4_0_IV1, 
MetadataVersion.fromVersionString("4.0-IV1"));
-        assertEquals(IBP_4_0_IV2, 
MetadataVersion.fromVersionString("4.0-IV2"));
-        assertEquals(IBP_4_0_IV3, 
MetadataVersion.fromVersionString("4.0-IV3"));
+        assertEquals(IBP_4_0_IV3, MetadataVersion.fromVersionString("4.0", 
true));
+        assertEquals(IBP_4_0_IV0, MetadataVersion.fromVersionString("4.0-IV0", 
true));
+        assertEquals(IBP_4_0_IV1, MetadataVersion.fromVersionString("4.0-IV1", 
true));
+        assertEquals(IBP_4_0_IV2, MetadataVersion.fromVersionString("4.0-IV2", 
true));
+        assertEquals(IBP_4_0_IV3, MetadataVersion.fromVersionString("4.0-IV3", 
true));
 
         // 4.1-IV1 is the latest production version in the 4.1 line
-        assertEquals(IBP_4_1_IV1, MetadataVersion.fromVersionString("4.1"));
-        assertEquals(IBP_4_1_IV0, 
MetadataVersion.fromVersionString("4.1-IV0"));
-        assertEquals(IBP_4_1_IV1, 
MetadataVersion.fromVersionString("4.1-IV1"));
+        assertEquals(IBP_4_1_IV1, MetadataVersion.fromVersionString("4.1", 
true));
+        assertEquals(IBP_4_1_IV0, MetadataVersion.fromVersionString("4.1-IV0", 
true));
+        assertEquals(IBP_4_1_IV1, MetadataVersion.fromVersionString("4.1-IV1", 
true));
 
-        assertEquals(IBP_4_2_IV0, 
MetadataVersion.fromVersionString("4.2-IV0"));
-        assertEquals(IBP_4_2_IV1, 
MetadataVersion.fromVersionString("4.2-IV1"));
+        assertEquals(IBP_4_2_IV0, MetadataVersion.fromVersionString("4.2-IV0", 
true));
+        assertEquals(IBP_4_2_IV1, MetadataVersion.fromVersionString("4.2-IV1", 
true));
+
+        // Throws exception when unstableFeatureVersionsEnabled is false
+        assertThrows(IllegalArgumentException.class, () -> 
MetadataVersion.fromVersionString("4.2-IV0", false));
+        assertThrows(IllegalArgumentException.class, () -> 
MetadataVersion.fromVersionString("4.2-IV1", false));

Review Comment:
   
https://github.com/apache/kafka/pull/20248/files#diff-e877a0c4e58bf2a34d621ae284d2b43bf18afa7d316aacbdd6c678dbb528f039R94
 do this test



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