import junit.framework.TestCase;

/** A JUnit test case class for the ObjectList composite classes. */

public class ObjectListTest extends TestCase {

  static ObjectList E = EmptyObjectList.ONLY;
  static ObjectList l1 = E.cons(17);                                               // '(17)
  static ObjectList l2 = l1.cons(5);                                               // '(5 17)
  static ObjectList l3 = E.cons(5);                                                // '(5)
  static ObjectList l5 = l3.cons(17);                                              // '(17 5)
  static ObjectList l6 = l5.cons(-5).cons(100).cons(50);                           // '(50 100 -5 17 5)
 
  /** Tests the listString method. */
  void testListString() {
    assertEquals("empty listString", "()", E.listString());
    assertEquals("(17) listString", "(17)", l1.listString());
    assertEquals("(5 17) listString", "(5 17)", l2.listString());
    assertEquals("(50 100 -5 17 5) test", "(50 100 -5 17 5)", l6.listString());
  }
}