Data-Structures/LinkedListTest.java at master · mchao409/Data-Structures · GitHub

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importstaticorg.junit.Assert.*;

importorg.junit.Test;

publicclassLinkedListTest {

@Test
publicvoidtestAddAtEnd() {
LinkedList<String> list = newLinkedList<String>();
list.add("hello");
assertTrue(list.getHead().getContents().equals("hello"));
list.add("apple");
assertTrue(list.getHead().getNext().getContents().equals("apple"));
 }

@Test
publicvoidtestAddAtIndex() {
LinkedList<Integer> list = newLinkedList<Integer>();
list.add(0,1); list.add(1,2); list.add(2,100);
list.add(0,10); list.add(1,3);
assertTrue(list.getHead().getContents() == 10);
assertTrue(list.getHead().getNext().getContents() == 3);
assertTrue(list.getHead().getNext().getNext().getContents() == 1);
assertTrue(list.getHead().getNext().getNext().getNext().getContents() == 2);
assertTrue(list.getHead().getNext().getNext().getNext().getNext().getContents() == 100);

 }

@Test
publicvoidtestClear() {
LinkedList<Integer> list = newLinkedList<Integer>();
list.clear();
assertTrue(list.head == null);

list.add(10);
list.clear();
assertTrue(list.head == null);

for(inti = 0 ; i < 100; i++) {
list.add(i);
 }
list.clear();
assertTrue(list.head == null);
 }

@Test
publicvoidtestRemoveIndex() {
LinkedList<Integer> list = newLinkedList<Integer>();
try {
list.remove(10);
fail();
 } catch (NullPointerExceptione) {}
list.add(1);

try {
list.remove(2);
fail();
 } catch (NullPointerExceptione) {}
assertTrue(list.remove(0) == 1);

for(inti = 0; i < 10; i++) {
list.add(i);
 }
assertTrue(list.remove(9) == 9);

try {
list.remove(9);
fail();
 } catch (NullPointerExceptione) {}

for(inti = 8; i >= 0; i--) {
assertTrue(list.remove(i) == i);
 }
 }

@Test
publicvoidtestRemoveObject() {
LinkedList<String> list = newLinkedList<String>();
assertFalse(list.remove("apple"));

String[] words = {"apple","apple","pear", "blueberry","banana", "apple"};
for(inti = 0; i < words.length; i++) {
list.add(words[i]);
 }
list.remove("apple");
assertTrue(list.getHead().getContents().equals("apple"));
list.remove("apple");
assertTrue(list.getHead().getNext().getNext()
 .getNext().getNext().getNext().getContents().equals("apple"));
assertTrue(list.contains("apple"));
for(inti = 2; i < words.length; i++) {
assertTrue(list.remove(words[i]));
 }

 }

@Test
publicvoidtestContains() {
LinkedList<Integer> list = newLinkedList<Integer>();
assertFalse(list.contains(10));
list.add(100);
assertTrue(list.contains(100));
list.remove(0);
assertFalse(list.contains(100));
for(inti = 0; i < 100; i++) {
list.add(i);
assertTrue(list.contains(i));
 }
for(inti = 99; i >= 0; i--) {
list.remove(i);
assertFalse(list.contains(i));
 }
 }

@Test
publicvoidtestSize() {
LinkedList<Integer> list = newLinkedList<Integer>();
assertTrue(list.size() == 0);
list.add(0);
assertTrue(list.size() == 1);
list.remove(0);
assertTrue(list.size() == 0);
for(inti = 0; i < 100; i++) {
list.add(i);
assertTrue(list.size() == i+1);
 }
for(inti = 99; i >= 0; i--) {
list.remove(i);
assertTrue(list.size() == i);
 }
 }
}