### Question:
IntList { public static IntList reverse(IntList A) { if (A == null) { return null; } IntList returnList = new IntList(A.first, null); while (A.rest != null) { A = A.rest; IntList tmp = new IntList(A.first, returnList); returnList = tmp; } return returnList; } IntList(int first0, IntList rest0);  IntList(); static void dSquareList(IntList L); static IntList squareListIterative(IntList L); static IntList squareListRecursive(IntList L); static IntList dcatenate(IntList A, IntList B); static IntList catenate(IntList A, IntList B); @Override int hashCode(); static IntList of(Integer... args); boolean equals(Object x); @Override /** Outputs the IntList as a String. You are not expected to read * or understand this method. */ String toString(); static IntList reverse(IntList A); IntList dereverse(); public int first; public IntList rest; }### Answer:
@Test(timeout = 1000) public void testReverse() { IntList A = IntList.of(1, 2, 3); IntList exp = IntList.of(3, 2, 1); IntList A2 = IntList.of(3, 4, 5, 6, 3); IntList exp2 = IntList.of(3, 6, 5, 4, 3); IntList A3 = IntList.of(3); IntList exp3 = IntList.of(3); assertEquals(exp, IntList.reverse(A)); assertEquals(exp2, IntList.reverse(A2)); assertEquals(exp3, IntList.reverse(A3)); assertNull(IntList.reverse(null)); }