package comp1110.exam;
import org.junit.FixMethodOrder;
import org.junit.Rule;
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import org.junit.Test;
import org.junit.rules.Timeout;
import org.junit.runners.MethodSorters;
import java.lang.ref.WeakReference;
import java.util.EmptyStackException;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static org.junit.Assert.*;
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class Q4ArrayStackTest {
public Timeout globalTimeout = Timeout.millis(500);
static class Thing {
final String name;
public Thing(String name) {
this.name = name;
public String toString() {
return “Thing ” + name;
public void testPushNotEmpty() {
Q4ArrayStack
assertTrue(“Newly created stack should be empty!”, stack.isEmpty());
Thing thing1 = new Thing(“One”);
stack.push(thing1);
assertFalse(“Stack should not be empty after one push”, stack.isEmpty());
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
assertFalse(“Stack should not be empty after two pushes”, stack.isEmpty());
public void testPushTwoString() {
Q4ArrayStack
checkToString(stack, “”);
Thing thing1 = new Thing(“One”);
stack.push(thing1);
checkToString(stack, “Thing One”);
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
checkToString(stack, “Thing Two,Thing One”);
private
assertTrue(“Incorrect output from toString(). Expected \”” + expected + “\” but got \”” + stack.toString() + “\””, expected.equals(stack.toString()));
public void testPopOne() {
Q4ArrayStack
Thing thingToDo = new Thing(“to do”);
stack.push(thingToDo);
checkPop(stack, thingToDo);
assertTrue(“Stack should be empty after one push and one pop”, stack.isEmpty());
public void testPopOneString() {
Q4ArrayStack
Thing thingToDo = new Thing(“to do”);
stack.push(thingToDo);
Thing thingToSee = new Thing(“to see”);
stack.push(thingToSee);
stack.pop();
checkToString(stack, “Thing to do”);
public void testPopTwo() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
stack.push(thing1);
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
checkPop(stack, thing2);
assertFalse(“Stack should be empty after two pushes and one pop”, stack.isEmpty());
checkPop(stack, thing1);
assertTrue(“Stack should be empty after two pushes and two pops”, stack.isEmpty());
public void testPopTwoString() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
stack.push(thing1);
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
stack.pop();
stack.pop();
checkToString(stack, “”);
@Test(expected = EmptyStackException.class)
public void testPopEmpty() {
Q4ArrayStack
stack.pop();
public void testEmptyString() {
Q4ArrayStack
checkToString(stack, “”);
public void testPeekOne() {
Q4ArrayStack
Thing thingToEat = new Thing(“to eat”);
stack.push(thingToEat);
Thing v = stack.peek();
assertTrue(“stack.peek() returned ” + v + “, expected ” + thingToEat, thingToEat == v);
assertFalse(“Stack should notbe empty after one push and one pop”, stack.isEmpty());
public void testPeekTwo() {
Q4ArrayStack
String a = “a”;
stack.push(a);
String b = “b”;
stack.push(b);
String v1 = stack.peek();
assertTrue(“stack.peek() returned ” + v1 + “, expected ” + b, b.equals(v1));
assertFalse(“Stack should be empty after two pushes and one peek”, stack.isEmpty());
String v2 = stack.peek();
assertTrue(“stack.peek() returned ” + v2 + “, expected ” + b, b.equals(v2));
assertFalse(“Stack should be empty after two pushes and two peeks”, stack.isEmpty());
stack.pop(); // throw away top value
String v3 = stack.peek();
assertTrue(“stack.peek() returned ” + v3 + “, expected ” + a, a.equals(v3));
public void testMultiplePush() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
stack.push(thing1);
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
stack.push(thing2);
checkPop(stack, thing2);
checkPop(stack, thing2);
checkPop(stack, thing1);
public void testMultiplePushString() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
stack.push(thing1);
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
checkToString(stack, “Thing Two,Thing One”);
stack.push(thing2);
checkToString(stack, “Thing Two,Thing Two,Thing One”);
stack.pop();
checkToString(stack, “Thing Two,Thing One”);
stack.pop();
checkToString(stack, “Thing One”);
@Test(expected = EmptyStackException.class)
public void testPeekEmpty() {
Q4ArrayStack
stack.peek();
public void testNoMemoryLeaks() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
stack.push(thing1);
WeakReference
Thing thing2 = new Thing(“Two”);
stack.push(thing2);
WeakReference
checkPop(stack, thing2);
checkPop(stack, thing1);
thing1 = null;
thing2 = null;
Runtime.getRuntime().gc();
assertNull(“A reference still exists to thing1 somewhere in the stack!”, reference1.get());
assertNull(“A reference still exists to thing2 somewhere in the stack!”, reference2.get());
public void testPushPopLarge() {
Q4ArrayStack
List
testRecursive(range, stack);
private void testRecursive(List
String v = values.remove(0);
stack.push(v);
assertFalse(“Stack should not be empty after pushing ” + v, stack.isEmpty());
if (!values.isEmpty()) {
testRecursive(values, stack);
String result = stack.pop();
assertTrue(“stack.pop() returned ” + result + “, expected ” + v, v.equals(result));
public void testContainsTop() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“stack.contains(thing1) returned true, expected false”, stack.contains(thing1));
assertFalse(“stack.contains(thing2) returned true, expected false”, stack.contains(thing2));
stack.push(thing1);
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
stack.push(thing2);
assertTrue(“stack.contains(thing2) returned false, expected true”, stack.contains(thing2));
stack.pop();
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
stack.pop();
assertFalse(“stack.contains(thing1) returned true, expected false”, stack.contains(thing1));
assertFalse(“stack.contains(null) returned true, expected false”, stack.contains(null));
public void testContainsBuried() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“stack.contains(thing1) returned true, expected false”, stack.contains(thing1));
assertFalse(“stack.contains(thing2) returned true, expected false”, stack.contains(thing2));
stack.push(thing1);
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
assertFalse(“stack.contains(thing2) returned true, expected false”, stack.contains(thing2));
stack.push(thing2);
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
assertTrue(“stack.contains(thing2) returned false, expected true”, stack.contains(thing2));
stack.pop();
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
assertFalse(“stack.contains(thing2) returned true, expected false”, stack.contains(thing2));
stack.pop();
assertFalse(“stack.contains(thing1) returned true, expected false”, stack.contains(thing1));
assertFalse(“stack.contains(thing2) returned true, expected false”, stack.contains(thing2));
public void testContainsDuplicateRemoved() {
Q4ArrayStack
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
stack.push(thing1);
stack.push(thing2);
stack.push(thing1);
stack.pop();
assertTrue(“stack.contains(thing1) returned false, expected true”, stack.contains(thing1));
public void testPopEmptyString() {
Q4ArrayStack
Thing thingvellir = new Thing(“vellir”);
stack.push(thingvellir);
stack.pop();
stack.pop();
} catch (EmptyStackException e) {
// ignore the exception
checkToString(stack, “”);
stack.push(thingvellir);
checkToString(stack, “Thing vellir”);
public void testContainsDeep() {
final int SIZE = 874;
Q4ArrayStack
for (int i = 0; i < SIZE; i++) {
stack.push(String.valueOf(i));
assertFalse("stack.contains(null) returned true, expected false", stack.contains(null));
for (int i = 0; i < SIZE; i++) {
assertTrue("stack.contains(\"" + i + "\") returned false, expected true", stack.contains(String.valueOf(i)));
private void checkPop(Q4ArrayStack
Thing result = stack.pop();
assertTrue(“stack.pop() returned ” + result + “, expected ” + expected, expected == result);
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