### Question:
HttpHeader implements Header { public void clear() { this.values.clear(); } HttpHeader(String name);  HttpHeader(String name, Collection<String> values); void value(String value); void clear(); Collection<String> values(); String name(); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString();  }### Answer:
@Test void canClear() { HttpHeader httpHeader = new HttpHeader("Content-Length", Collections.singletonList("123456")); httpHeader.clear(); assertThat(httpHeader).hasNoValues(); }