### Question:
CacheKeyBuilder { public String build() { StringBuilder keyBuilder = new StringBuilder(2 * String.valueOf(legacyParams[0]).length()); appendLegacyKeys(keyBuilder); if (!paramMap.isEmpty()) { for (Map.Entry<String, Object> mapEntry : paramMap.entrySet()) { keyBuilder.append(KEY_SEPARATOR); keyBuilder.append(String.format("%s=%s", mapEntry.getKey(), mapEntry.getValue())); } } return keyBuilder.toString(); } CacheKeyBuilder(); CacheKeyBuilder setLegacyParam(int index, Object value); CacheKeyBuilder setParam(String name, Object value); String build();  }### Answer:
@Test public void testBuilder() { assertEquals("http: }