### Question:
SoliumKeyUtils { public static boolean keyExists(String key) { return rulesKeyset.contains(key); } private  SoliumKeyUtils(); static boolean keyExists(String key);  }### Answer:
@Test public void test() { assertThat(SoliumKeyUtils.keyExists(("imports-on-top"))).isTrue(); assertThat(SoliumKeyUtils.keyExists("security/no-unreachable-code")).isTrue(); assertThat(SoliumKeyUtils.keyExists("no_rule")).isFalse(); }