@Parameterized.Parameters
  public static List<Object[]> data() {
    return Arrays.asList(new Object[][]{{false}, {true}});
  }
Constructor for {@link AmbryUrlSigningServiceTest}.
@param isReservedMetadataEnabled {@code true} is reserved metadata feature is enabled. {@code false} otherwise.
@throws Exception in case of any errors.
ambry-frontend/src/test/java/com/github/ambry/frontend/AmbryUrlSigningServiceTest.java