package comp1110.exam;
import org.junit.FixMethodOrder;
import org.junit.Rule;
Copyright By PowCoder代写 加微信 powcoder
import org.junit.Test;
import org.junit.rules.Timeout;
import org.junit.runners.MethodSorters;
import java.lang.ref.WeakReference;
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 Q4FerrisWheelTest {
public Timeout globalTimeout = Timeout.millis(1000);
static class Thing {
final String name;
public Thing(String name) {
this.name = name;
public String toString() {
return “Thing ” + name;
public void testLoadNotEmpty() {
Q4FerrisWheel
assertTrue(“Newly created ferrisWheel should be empty!”, ferrisWheel.isEmpty());
Thing thing1 = new Thing(“One”);
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(thing1));
assertFalse(“FerrisWheel should not be empty after load”, ferrisWheel.isEmpty());
public void testLoadString() {
Q4FerrisWheel
checkToString(ferrisWheel, “,,,,,,,,,”);
Thing thing1 = new Thing(“One”);
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(thing1));
checkToString(ferrisWheel, “Thing One,,,,,,,,,”);
private
assertTrue(“Incorrect output from toString(). Expected \”” + expected + “\” but got \”” + ferrisWheel.toString() + “\””, expected.equals(ferrisWheel.toString()));
public void testLoadUnload() {
Q4FerrisWheel
Thing thingToDo = new Thing(“to do”);
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(thingToDo));
checkUnload(ferrisWheel, thingToDo);
assertTrue(“FerrisWheel should be empty after one load and one unload”, ferrisWheel.isEmpty());
public void testLoadUnloadString() {
Q4FerrisWheel
Thing thingToDo = new Thing(“to do”);
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(thingToDo));
checkToString(ferrisWheel, “Thing to do,,,,,,,”);
checkUnload(ferrisWheel, thingToDo);
checkToString(ferrisWheel, “,,,,,,,”);
public void testLoadSpinUnload() {
final int SIZE = 7;
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
assertTrue(“FerrisWheel.load() should not return false after one load and one spin”, ferrisWheel.load(thing1));
ferrisWheel.spin();
Thing thing2 = new Thing(“Two”);
assertTrue(“FerrisWheel.load() should not return false after one load and one spin”, ferrisWheel.load(thing2));
checkUnload(ferrisWheel, thing2);
assertFalse(“FerrisWheel should not be empty after two loads and one unload”, ferrisWheel.isEmpty());
for (int i = 0; i < SIZE - 1; i++) {
ferrisWheel.spin();
checkUnload(ferrisWheel, thing1);
assertTrue("FerrisWheel should be empty after two loads and two unloads", ferrisWheel.isEmpty());
public void testLoadSpinUnloadString() {
final int SIZE = 7;
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
assertTrue(“FerrisWheel.load() should not return false after one load and one spin”, ferrisWheel.load(thing1));
checkToString(ferrisWheel, “Thing One,,,,,,”);
ferrisWheel.spin();
checkToString(ferrisWheel, “,,,,,,Thing One”);
Thing thing2 = new Thing(“Two”);
assertTrue(“FerrisWheel.load() should not return false after one load and one spin”, ferrisWheel.load(thing2));
checkToString(ferrisWheel, “Thing Two,,,,,,Thing One”);
checkUnload(ferrisWheel, thing2);
checkToString(ferrisWheel, “,,,,,,Thing One”);
assertFalse(“FerrisWheel should not be empty after two loads and one unload”, ferrisWheel.isEmpty());
for (int i = 0; i < SIZE - 1; i++) ferrisWheel.spin();
checkToString(ferrisWheel, "Thing One,,,,,,");
checkUnload(ferrisWheel, thing1);
assertTrue("FerrisWheel should be empty after two loads and two unloads", ferrisWheel.isEmpty());
checkToString(ferrisWheel, ",,,,,,");
public void testUnloadEmptyWheel() {
Q4FerrisWheel
assertNull(“ferrisWheel.unload() should return null for empty wheel, but returned non-null”, ferrisWheel.unload());
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(“One”));
public void testUnloadEmptyCar() {
Q4FerrisWheel
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(“One”));
ferrisWheel.spin();
assertNull(“ferrisWheel.unload() should return null for empty car, but returned non-null”, ferrisWheel.unload());
public void testLoadFullCar() {
Q4FerrisWheel
assertTrue(“FerrisWheel.load() should not return false for empty wheel”, ferrisWheel.load(“One”));
assertFalse(“ferrisWheel.load() should return false for full car, but returned true”, ferrisWheel.load(“Two”));
public void testLoadFullDoesNotOverwrite() {
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
ferrisWheel.load(thing1);
Thing thing2 = new Thing(“Two”);
assertFalse(“ferrisWheel.load() should return false for full car, but returned true”, ferrisWheel.load(thing2));
// after failure to load thing2, thing1 should still be in car
checkUnload(ferrisWheel, thing1);
public void testLoadFullString() {
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
ferrisWheel.load(thing1);
checkToString(ferrisWheel, “Thing One,,,,”);
Thing thing2 = new Thing(“Two”);
ferrisWheel.load(thing2);
checkToString(ferrisWheel, “Thing One,,,,”);
public void testUnloadTwice() {
Q4FerrisWheel
String a = “a”;
ferrisWheel.load(a);
ferrisWheel.spin();
String b = “b”;
ferrisWheel.load(b);
String v1 = ferrisWheel.unload();
assertTrue(“ferrisWheel.unload() returned ” + v1 + “, expected ” + b, b.equals(v1));
String v2 = ferrisWheel.unload();
assertNull(“ferrisWheel.unload() returned ” + v2 + “, should be null”, v2);
public void testNoMemoryLeaks() {
final int SIZE = 15;
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
ferrisWheel.load(thing1);
ferrisWheel.spin();
WeakReference
Thing thing2 = new Thing(“Two”);
ferrisWheel.load(thing2);
WeakReference
checkUnload(ferrisWheel, thing2);
for (int i = 0; i < SIZE - 1; i++) ferrisWheel.spin();
checkUnload(ferrisWheel, thing1);
thing1 = null;
thing2 = null;
Runtime.getRuntime().gc();
assertNull("A reference still exists to thing1 somewhere in the FerrisWheel!", reference1.get());
assertNull("A reference still exists to thing2 somewhere in the FerrisWheel!", reference2.get());
public void testLoadUnloadLarge() {
List
Q4FerrisWheel
testCircle(range, ferrisWheel);
// assumes values list is initially as large as the wheel
private void testCircle(List
for (String v : values) {
assertTrue(“ferrisWheel.load returned false for empty car, should return true”, ferrisWheel.load(v));
assertFalse(“ferrisWheel should not be empty after loading ” + v, ferrisWheel.isEmpty());
ferrisWheel.spin();
for (String v : values) {
String result = ferrisWheel.unload();
assertTrue(“ferrisWheel.pop() returned ” + result + “, expected ” + v, v.equals(result));
ferrisWheel.spin();
public void testContainsBottom() {
final int SIZE = 13;
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“ferrisWheel.contains(thing1) returned true, expected false”, ferrisWheel.contains(thing1));
assertFalse(“ferrisWheel.contains(thing2) returned true, expected false”, ferrisWheel.contains(thing2));
ferrisWheel.load(thing1);
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
ferrisWheel.spin();
ferrisWheel.load(thing2);
assertTrue(“ferrisWheel.contains(thing2) returned false, expected true”, ferrisWheel.contains(thing2));
ferrisWheel.unload();
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
for (int i = 0; i < SIZE - 1; i++) ferrisWheel.spin();
ferrisWheel.unload();
assertFalse("ferrisWheel.contains(thing1) returned true, expected false", ferrisWheel.contains(thing1));
assertFalse("ferrisWheel.contains(null) returned true, expected false", ferrisWheel.contains(null));
public void testContainsBuried() {
final int SIZE = 4;
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“ferrisWheel.contains(thing1) returned true, expected false”, ferrisWheel.contains(thing1));
assertFalse(“ferrisWheel.contains(thing2) returned true, expected false”, ferrisWheel.contains(thing2));
ferrisWheel.load(thing1);
ferrisWheel.spin();
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
assertFalse(“ferrisWheel.contains(thing2) returned true, expected false”, ferrisWheel.contains(thing2));
ferrisWheel.load(thing2);
ferrisWheel.spin();
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
assertTrue(“ferrisWheel.contains(thing2) returned false, expected true”, ferrisWheel.contains(thing2));
for (int i = 0; i < SIZE - 2; i++) ferrisWheel.spin();
ferrisWheel.unload();
assertFalse("ferrisWheel.contains(thing1) returned true, expected false", ferrisWheel.contains(thing1));
assertTrue("ferrisWheel.contains(thing2) returned false, expected true", ferrisWheel.contains(thing2));
ferrisWheel.spin();
ferrisWheel.unload();
assertFalse("ferrisWheel.contains(thing1) returned true, expected false", ferrisWheel.contains(thing1));
assertFalse("ferrisWheel.contains(thing2) returned true, expected false", ferrisWheel.contains(thing2));
public void testContainsRemoved() {
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
ferrisWheel.load(thing1);
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
ferrisWheel.unload();
assertFalse(“ferrisWheel.contains(thing1) returned true, expected flase”, ferrisWheel.contains(thing1));
public void testContainsDuplicateRemoved() {
Q4FerrisWheel
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
ferrisWheel.load(thing1);
ferrisWheel.spin();
ferrisWheel.load(thing2);
ferrisWheel.spin();
ferrisWheel.load(thing1);
ferrisWheel.unload();
assertTrue(“ferrisWheel.contains(thing1) returned false, expected true”, ferrisWheel.contains(thing1));
public void testLoadUnloadTwiceString() {
Q4FerrisWheel
Thing thingvellir = new Thing(“vellir”);
ferrisWheel.load(thingvellir);
ferrisWheel.unload();
ferrisWheel.unload();
checkToString(ferrisWheel, “,,,,,,,,”);
ferrisWheel.load(thingvellir);
checkToString(ferrisWheel, “Thing vellir,,,,,,,,”);
public void testContainsLarge() {
final int SIZE = 874;
Q4FerrisWheel
for (int i = 0; i < SIZE; i++) {
ferrisWheel.load(String.valueOf(i));
ferrisWheel.spin();
assertFalse("ferrisWheel.contains(null) returned true, expected false", ferrisWheel.contains(null));
for (int i = 0; i < SIZE; i++) {
assertTrue("ferrisWheel.contains(\"" + i + "\") returned false, expected true", ferrisWheel.contains(String.valueOf(i)));
private void checkUnload(Q4FerrisWheel
Thing result = ferrisWheel.unload();
assertTrue(“ferrisWheel.unload() returned ” + result + “, expected ” + expected, expected == result);
程序代写 CS代考 加微信: powcoder QQ: 1823890830 Email: powcoder@163.com