@Test
    public void testMetadataVersionsToString() {
        assertEquals("3.3-IV0, 3.3-IV1, 3.3-IV2, 3.3-IV3",
            FeatureCommand.metadataVersionsToString(MetadataVersion.IBP_3_3_IV0, MetadataVersion.IBP_3_3_IV3));
    }
Unit test of {@link FeatureCommand} tool.
tools/src/test/java/org/apache/kafka/tools/FeatureCommandTest.java