### Question:
ThreadUtils { public static String addElasticApmThreadPrefix(String purpose) { return ELASTIC_APM_THREAD_PREFIX + purpose; } private  ThreadUtils(); static String addElasticApmThreadPrefix(String purpose); static final String ELASTIC_APM_THREAD_PREFIX; }### Answer:
@Test public void testAddElasticApmThreadPrefix() { String purpose = RandomStringUtils.randomAlphanumeric(10); String prefixedThreadName = ThreadUtils.addElasticApmThreadPrefix(purpose); assertThat(prefixedThreadName).isEqualTo("elastic-apm-"+purpose); }