src/main/java/org/fest/assertions/error/ShouldContainOnly.java
public static ErrorMessageFactory shouldContainOnly(Object actual, Object expected, Object notFound, Object notExpected) {
    return new ShouldContainOnly(actual, expected, notFound, notExpected);
  }
public static ErrorMessageFactory shouldContainOnly(Object actual, Object expected, Object notFound, Object notExpected) {
    return new ShouldContainOnly(actual, expected, notFound, notExpected);
  }
Creates a new </code>{@link ShouldContainOnly}</code>.
@param actual the actual value in the failed assertion.
@param expected values expected to be contained in {@code actual}.
@param notFound values in {@code expected} not found in {@code actual}.
@param notExpected values in {@code actual} that were not in {@code expected}.
@return the created {@code ErrorMessageFactory}.