StackTest.java

class StackTest {
    static public void main(String[] args) {
	ListStack stack  = new ListStack();

	//Empty stack should say its empty
	Tester.test(stack.notEmpty(), false);

	//Test to make sure pop from empty stack returns null
	Tester.test(stack.pop(), null);

	stack.push("one");

	//Stack should say its not empty now
	Tester.test(stack.notEmpty(), true);

	stack.push("two");
	stack.push("three");

	Tester.test(stack.pop(),"three");
	Tester.test(stack.pop(),"two");

	//Test to see if stack accept different kinds of objects
	stack.push(new Integer(100000));
	Tester.test((Integer)stack.pop(), new Integer(100000));

	//Empty the stack and make sure it acts empty
	drain(stack);
	stack.pop();
	Tester.test(stack.notEmpty(), false);
	Tester.test(stack.pop(), null);

	//See if we can push lots of things onto stack
	for (int i=0; i<1000; i++) {
	    stack.push(new Integer(i));
	}

	Tester.test((Integer)stack.pop(),new Integer(999));

	//pop off all but final value
	for (int i=998; i>=0; i--) {
	    Tester.test((Integer) stack.pop(), new Integer(i));
	}

	//Should be empty again
	Tester.test(stack.notEmpty(), false);
	
	Tester.printResults();
    }

    static void drain(ListStack s) {
	while (s.notEmpty()) {
	    s.pop();
	}
    }
}