gaurav-narula commented on code in PR #22384:
URL: https://github.com/apache/kafka/pull/22384#discussion_r3324292695


##########
metadata/src/test/java/org/apache/kafka/metadata/storage/FormatterTest.java:
##########
@@ -587,4 +587,18 @@ public void testFormatWithNoInitialControllers() throws 
Exception {
             assertNotNull(logDirProps1);
         }
     }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"unrvTtQISjar0JUWGU/8Pg", 
"igNUVIdeSPO5JCZYFhOh7Q==", "AAAAAAAAAAAAAAAAAAAAAA", "AAAAAAAAAAAAAAAAAAAAAQ"})
+    public void testFormatWithInvalidClusterId(String clusterId) throws 
Exception {
+        try (TestEnv testEnv = new TestEnv(2)) {
+            FormatterContext formatter1 = testEnv.newFormatter();
+            formatter1.formatter.setClusterId(clusterId);
+            String expectedPrefix = "The specified cluster id, " + clusterId;
+            assertEquals(expectedPrefix,
+                    assertThrows(FormatterException.class,
+                            formatter1.formatter::run).
+                            getMessage().substring(0, 
expectedPrefix.length()));

Review Comment:
   I'm indifferent here - I followed the convention used in another test in the 
same class



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