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.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static org.junit.Assert.*;
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class Q4SushiTrainTest {
public Timeout globalTimeout = Timeout.millis(2000);
static class Thing {
final String name;
public Thing(String name) {
this.name = name;
public String toString() {
return “Thing ” + name;
public void testAddNotEmpty() {
Q4SushiTrain
assertTrue(“Newly created SushiTrain should be empty!”, SushiTrain.isEmpty());
Thing thing1 = new Thing(“One”);
assertTrue(“SushiTrain.add() should not return false for empty train”, SushiTrain.add(thing1));
assertFalse(“SushiTrain should not be empty after add”, SushiTrain.isEmpty());
public void testAddString() {
Q4SushiTrain
checkToString(SushiTrain, “,,,,,,,,,”);
Thing thing1 = new Thing(“One”);
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(thing1));
checkToString(SushiTrain, “Thing One,,,,,,,,,”);
private
assertTrue(“Incorrect output from toString(). Expected \”” + expected + “\” but got \”” + SushiTrain.toString() + “\””, expected.equals(SushiTrain.toString()));
public void testLoadRemove() {
Q4SushiTrain
Thing thingToDo = new Thing(“to do”);
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(thingToDo));
checkRemove(SushiTrain, thingToDo, 0);
assertTrue(“SushiTrain should be empty after one add and one remove”, SushiTrain.isEmpty());
private void checkRemove(Q4SushiTrain
Thing result = SushiTrain.remove(pos);
assertTrue(“SushiTrain.remove(“+pos+”) returned ” + result + “, expected ” + expected, expected == result);
public void testAddRemoveString() {
Q4SushiTrain
Thing thingToDo = new Thing(“to do”);
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(thingToDo));
checkToString(SushiTrain, “Thing to do,,,,,,,”);
checkRemove(SushiTrain, thingToDo, 0);
checkToString(SushiTrain, “,,,,,,,”);
public void testAddAddRemoveNonZeroString() {
Q4SushiTrain
Thing thing1 = new Thing(“One”);
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(thing1));
checkToString(SushiTrain, “Thing One,,,,,,,”);
SushiTrain.advance();
Thing thing2 = new Thing(“Two”);
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(thing2));
checkToString(SushiTrain, “Thing Two,Thing One,,,,,,”);
checkRemove(SushiTrain, thing1, 1);
checkToString(SushiTrain, “Thing Two,,,,,,,”);
public void testAddAdvanceRemove() {
final int SIZE = 7;
Q4SushiTrain
Thing thing1 = new Thing(“One”);
assertTrue(“SushiTrain.add() should not return false when empty”, SushiTrain.add(thing1));
SushiTrain.advance();
Thing thing2 = new Thing(“Two”);
assertTrue(“SushiTrain.add() should not return false after one add and one advance”, SushiTrain.add(thing2));
checkRemove(SushiTrain, thing2, 0);
assertFalse(“SushiTrain should not be empty after two loads and one remove”, SushiTrain.isEmpty());
for (int i = 0; i < SIZE - 1; i++) {
SushiTrain.advance();
checkRemove(SushiTrain, thing1, 0);
assertTrue("SushiTrain should be empty after two loads and two removes", SushiTrain.isEmpty());
public void testAddAdvanceRemoveString() {
final int SIZE = 7;
Q4SushiTrain
Thing thing1 = new Thing(“One”);
assertTrue(“SushiTrain.add() should not return false after one add and one advance”, SushiTrain.add(thing1));
checkToString(SushiTrain, “Thing One,,,,,,”);
SushiTrain.advance();
checkToString(SushiTrain, “,Thing One,,,,,”);
Thing thing2 = new Thing(“Two”);
assertTrue(“SushiTrain.add() should not return false after one add and one advance”, SushiTrain.add(thing2));
checkToString(SushiTrain, “Thing Two,Thing One,,,,,”);
checkRemove(SushiTrain, thing2, 0);
checkToString(SushiTrain, “,Thing One,,,,,”);
assertFalse(“SushiTrain should not be empty after two adds and one remove”, SushiTrain.isEmpty());
for (int i = 0; i < SIZE - 2; i++) SushiTrain.advance();
checkToString(SushiTrain, ",,,,,,Thing One");
checkRemove(SushiTrain, thing1, SIZE - 1);
assertTrue("SushiTrain should be empty after two adds and two removes", SushiTrain.isEmpty());
checkToString(SushiTrain, ",,,,,,");
public void testRemoveEmptyTrain() {
Q4SushiTrain
assertNull(“SushiTrain.remove() should return null for empty train, but returned non-null”, SushiTrain.remove(0));
assertTrue(“SushiTrain.add() should not return false for empty train”, SushiTrain.add(“One”));
public void testRemoveEmptyHolder() {
Q4SushiTrain
assertTrue(“SushiTrain.add() should not return false for empty wheel”, SushiTrain.add(“One”));
SushiTrain.advance();
assertNull(“SushiTrain.remove() should return null for empty holder, but returned non-null”, SushiTrain.remove(2));
public void testAddFullHolder() {
Q4SushiTrain
assertTrue(“SushiTrain.add() should not return false for empty belt”, SushiTrain.add(“One”));
assertFalse(“SushiTrain.add() should return false for full holder, but returned true”, SushiTrain.add(“Two”));
public void testAddFullDoesNotOverwrite() {
Q4SushiTrain
Thing thing1 = new Thing(“One”);
SushiTrain.add(thing1);
Thing thing2 = new Thing(“Two”);
assertFalse(“SushiTrain.add() should return false for full holder, but returned true”, SushiTrain.add(thing2));
// after failure to load thing2, thing1 should still be in car
checkRemove(SushiTrain, thing1, 0);
public void testAddFullString() {
Q4SushiTrain
Thing thing1 = new Thing(“One”);
SushiTrain.add(thing1);
checkToString(SushiTrain, “Thing One,,,,”);
Thing thing2 = new Thing(“Two”);
SushiTrain.add(thing2);
checkToString(SushiTrain, “Thing One,,,,”);
public void testRemoveTwice() {
Q4SushiTrain
String a = “a”;
SushiTrain.add(a);
SushiTrain.advance();
String b = “b”;
SushiTrain.add(b);
SushiTrain.advance();
String v1 = SushiTrain.remove(1);
assertTrue(“SushiTrain.remove() returned ” + v1 + “, expected ” + b, b.equals(v1));
String v2 = SushiTrain.remove(1);
assertNull(“SushiTrain.remove() returned ” + v2 + “, should be null”, v2);
public void testNoMemoryLeaks() {
final int SIZE = 15;
Q4SushiTrain
Thing thing1 = new Thing(“One”);
SushiTrain.add(thing1);
SushiTrain.advance();
WeakReference
Thing thing2 = new Thing(“Two”);
SushiTrain.add(thing2);
WeakReference
checkRemove(SushiTrain, thing2, 0);
for (int i = 0; i < SIZE - 1; i++) SushiTrain.advance();
checkRemove(SushiTrain, thing1, 0);
thing1 = null;
thing2 = null;
Runtime.getRuntime().gc();
assertNull("A reference still exists to thing1 somewhere in the SushiTrain!", reference1.get());
assertNull("A reference still exists to thing2 somewhere in the SushiTrain!", reference2.get());
public void testLoadRemoveLarge() {
List
Q4SushiTrain
testCircle(range, SushiTrain);
// assumes values list is initially as large as the wheel
private void testCircle(List
for (String v : values) {
assertTrue(“SushiTrain.add() returned false for empty holder, should return true”, SushiTrain.add(v));
assertFalse(“SushiTrain should not be empty after loading ” + v, SushiTrain.isEmpty());
SushiTrain.advance();
for (String v : values) {
String result = SushiTrain.remove(0);
assertTrue(“SushiTrain.remove(0) returned ” + result + “, expected ” + v, v.equals(result));
SushiTrain.advance();
public void testContainsBottom() {
final int SIZE = 13;
Q4SushiTrain
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“SushiTrain.contains(thing1) returned true, expected false”, SushiTrain.contains(thing1));
assertFalse(“SushiTrain.contains(thing2) returned true, expected false”, SushiTrain.contains(thing2));
SushiTrain.add(thing1);
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
SushiTrain.advance();
SushiTrain.add(thing2);
SushiTrain.advance();
assertTrue(“SushiTrain.contains(thing2) returned false, expected true”, SushiTrain.contains(thing2));
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
for (int i = 0; i < SIZE - 1; i++) SushiTrain.advance();
SushiTrain.remove(1);
assertFalse("SushiTrain.contains(thing1) returned true, expected false", SushiTrain.contains(thing1));
assertFalse("SushiTrain.contains(null) returned true, expected false", SushiTrain.contains(null));
public void testContainsBuried() {
final int SIZE = 4;
Q4SushiTrain
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
assertFalse(“SushiTrain.contains(thing1) returned true, expected false”, SushiTrain.contains(thing1));
assertFalse(“SushiTrain.contains(thing2) returned true, expected false”, SushiTrain.contains(thing2));
SushiTrain.add(thing1);
SushiTrain.advance();
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
assertFalse(“SushiTrain.contains(thing2) returned true, expected false”, SushiTrain.contains(thing2));
SushiTrain.add(thing2);
SushiTrain.advance();
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
assertTrue(“SushiTrain.contains(thing2) returned false, expected true”, SushiTrain.contains(thing2));
for (int i = 0; i < SIZE - 2; i++) SushiTrain.advance();
SushiTrain.remove(0);
assertFalse("SushiTrain.contains(thing1) returned true, expected false", SushiTrain.contains(thing1));
assertTrue("SushiTrain.contains(thing2) returned false, expected true", SushiTrain.contains(thing2));
SushiTrain.advance();
SushiTrain.remove(0);
assertFalse("SushiTrain.contains(thing1) returned true, expected false", SushiTrain.contains(thing1));
assertFalse("SushiTrain.contains(thing2) returned true, expected false", SushiTrain.contains(thing2));
public void testContainsRemoved() {
Q4SushiTrain
Thing thing1 = new Thing(“One”);
SushiTrain.add(thing1);
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
SushiTrain.remove();
assertFalse(“SushiTrain.contains(thing1) returned true, expected flase”, SushiTrain.contains(thing1));
public void testContainsDuplicateRemoved() {
Q4SushiTrain
Thing thing1 = new Thing(“One”);
Thing thing2 = new Thing(“Two”);
SushiTrain.add(thing1);
SushiTrain.advance();
SushiTrain.add(thing2);
SushiTrain.advance();
SushiTrain.add(thing1);
SushiTrain.remove(0);
assertTrue(“SushiTrain.contains(thing1) returned false, expected true”, SushiTrain.contains(thing1));
public void testLoadRemoveTwiceString() {
Q4SushiTrain
Thing thingvellir = new Thing(“vellir”);
SushiTrain.add(thingvellir);
SushiTrain.remove(0);
SushiTrain.remove(0);
checkToString(SushiTrain, “,,,,,,,,”);
SushiTrain.add(thingvellir);
checkToString(SushiTrain, “Thing vellir,,,,,,,,”);
public void testContainsLarge() {
final int SIZE = 874;
Q4SushiTrain
for (int i = 0; i < SIZE; i++) {
SushiTrain.add(String.valueOf(i));
SushiTrain.advance();
assertFalse("SushiTrain.contains(null) returned true, expected false", SushiTrain.contains(null));
for (int i = 0; i < SIZE; i++) {
assertTrue("SushiTrain.contains(\"" + i + "\") returned false, expected true", SushiTrain.contains(String.valueOf(i)));
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