IfNoneMatchPreconditionHeader implements PreconditionHeader<EntityTag> { @Override public String getValue() { return entityTagsToMatch.toString(); } private  IfNoneMatchPreconditionHeader(final EntityTagMatchers entityTagsToMatch); @Override String getKey(); @Override String getValue(); @Override boolean meetsConditionFor(@Nullable final EntityTag entityTag); static Optional<IfNoneMatchPreconditionHeader> fromDittoHeaders(final DittoHeaders dittoHeaders);  }
@Test public void getValue() { final IfNoneMatchPreconditionHeader ifNoneMatchPreconditionHeader = createIfNoneMatchPreconditionHeader(EntityTagMatchers.fromCommaSeparatedString("\"4711\"")); assertThat(ifNoneMatchPreconditionHeader.getValue()).isEqualTo("\"4711\""); }