src/main/java/org/fest/assertions/error/ShouldBeSubsetOf.java
public static ErrorMessageFactory shouldBeSubsetOf(Object actual, Object values, Iterable<?> unexpected) {
    return new ShouldBeSubsetOf(actual, values, unexpected);
  }
public static ErrorMessageFactory shouldBeSubsetOf(Object actual, Object values, Iterable<?> unexpected) {
    return new ShouldBeSubsetOf(actual, values, unexpected);
  }
Creates a new <code>{@link ShouldBeSubsetOf}</code>.
@param actual the actual set
@param values the expected superset
@param unexpected the elements found in the actual set, but not in the given values.
@return the created {@code ErrorMessageFactory}.