@Test
public void validateValidMetadataHeadersCharSequence() {

    final MetadataHeaders metadataHeaders = MetadataHeaders.newInstance();
    metadataHeaders.add(MetadataHeader.of(MetadataHeaderKey.parse("/*/issuedBy"), JsonValue.of("me")));
    metadataHeaders.add(MetadataHeader.of(MetadataHeaderKey.parse("/foo/bar"), JsonValue.of("baz")));
    final MetadataHeadersValueValidator underTest = MetadataHeadersValueValidator.getInstance();
    assertThatCode(() -> underTest.accept(DittoHeaderDefinition.PUT_METADATA, metadataHeaders.toJsonString()))
            .doesNotThrowAnyException();
}