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SinglyLinkedListTest.java
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317 lines (286 loc) · 8.29 KB
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import static org.junit.Assert.*;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.junit.Test;
public class SinglyLinkedListTest {
@Test
public void testCreate() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
assertTrue(l.isEmpty());
}
@Test
public void test_addLast() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
l.addLast(1);
assertEquals(new Integer(1), l.head.data);
assertEquals(null, l.head.next);
assertEquals(l.head, l.tail);
assertEquals(l.toString(), "[1]");
l.addLast(2);
assertEquals(l.toString(), "[1 -> 2]");
l.addLast(3);
assertEquals(l.toString(), "[1 -> 2 -> 3]");
}
@Test
public void test_toString() {
assertEquals(
new SinglyLinkedList<Integer>(new Integer[] {}).toString(),
"[]");
assertEquals(
new SinglyLinkedList<Integer>(new Integer[] { 0 }).toString(),
"[0]");
assertEquals(
new SinglyLinkedList<Integer>(new Integer[] { 0, 1 })
.toString(),
"[0 -> 1]");
assertEquals(
new SinglyLinkedList<Integer>(new Integer[] { 0, 1, 2 })
.toString(),
"[0 -> 1 -> 2]");
}
@Test
public void test_constructor_takes_Array_parameter() {
assertEquals(new SinglyLinkedList<String>(
new String[] { "hi", "there" }).toString(), "[hi -> there]");
}
@Test
public void test_addNodeLast() {
SinglyLinkedList<Integer> l1 = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
SinglyLinkedList<Integer> l2 = new SinglyLinkedList<Integer>(
new Integer[] { 3, 4 });
l1.addNodeLast(l2.head);
assertEquals("[1 -> 2 -> 3 -> 4]", l1.toString());
l1.addLast(5);
assertEquals("[1 -> 2 -> 3 -> 4 -> 5]", l1.toString());
}
@Test
public void test_add_at_0_on_an_empty_list() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
l.add(0, 1);
assertEquals("[1]", l.toString());
}
@Test
public void test_add_at_0_list_with_1_item() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1 });
l.add(0, 2);
assertEquals("[2 -> 1]", l.toString());
}
@Test
public void test_add_at_0_list_with_2_items() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
l.add(0, 0);
assertEquals("[0 -> 1 -> 2]", l.toString());
}
@Test
public void test_add_at_1_list_with_2_items() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
l.add(1, 0);
assertEquals("[1 -> 0 -> 2]", l.toString());
}
@Test
public void test_add_at_2_list_with_2_items() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
l.add(2, 0);
assertEquals("[1 -> 2 -> 0]", l.toString());
}
@Test
public void test_size() {
assertEquals(0, new SinglyLinkedList<Integer>().size());
assertEquals(1,
new SinglyLinkedList<Integer>(new Integer[] { 1 }).size());
assertEquals(2,
new SinglyLinkedList<Integer>(new Integer[] { 1, 2 }).size());
}
@Test
public void test_iterator_two() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
Iterator<Integer> i = l.iterator();
assertNotNull(i);
assertTrue(i.hasNext());
assertEquals(i.next(), new Integer(1));
assertTrue(i.hasNext());
assertEquals(i.next(), new Integer(2));
assertFalse(i.hasNext());
try {
i.next();
fail("expeted NoSuchElementException");
} catch (NoSuchElementException e) {
} // ok
}
@Test
public void test_iterator_one() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1 });
Iterator<Integer> i = l.iterator();
assertNotNull(i);
assertTrue(i.hasNext());
assertEquals(i.next(), new Integer(1));
assertFalse(i.hasNext());
try {
i.next();
fail("expeted NoSuchElementException");
} catch (NoSuchElementException e) {
} // ok
}
@Test
public void test_iterator_none() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
Iterator<Integer> i = l.iterator();
assertNotNull(i);
assertFalse(i.hasNext());
try {
i.next();
fail("expeted NoSuchElementException");
} catch (NoSuchElementException e) {
} // ok
}
@Test
public void test_iterator_remove_from_two() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
Iterator<Integer> i = l.iterator();
i.next();
i.remove();
assertEquals("[2]", l.toString());
assertEquals(l.head, l.tail);
assertEquals(new Integer(2), i.next());
i.remove();
assertEquals("[]", l.toString());
assertNull(l.head);
assertNull(l.tail);
}
@Test
public void test_iterator_remove_second_from_two() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1, 2 });
Iterator<Integer> i = l.iterator();
i.next();
i.next();
i.remove();
assertEquals("[1]", l.toString());
assertEquals(l.head, l.tail);
}
@Test
public void test_iterator_remove_from_single() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(
new Integer[] { 1 });
Iterator<Integer> i = l.iterator();
i.next();
i.remove();
assertEquals("[]", l.toString());
assertNull(l.head);
assertNull(l.tail);
}
@Test
public void test_iterator_throws_IllegalStateException_if_next_hasnt_been_called() {
for (int i = 0; i < 3; i++) {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
for (int j = 0; j < i; j++) {
l.addLast(j);
}
Iterator<Integer> it = l.iterator();
try {
it.remove();
fail("expected IllegalStateException");
} catch (IllegalStateException ex) {
} // ok
}
}
@Test
public void test_iterator_throws_IllegalStateException_if_called_twice() {
for (int i = 0; i < 3; i++) {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>();
for (int j = 0; j < i; j++) {
l.addLast(j);
}
Iterator<Integer> it = l.iterator();
while (it.hasNext()) {
it.next();
it.remove();
}
try {
it.remove();
fail("expected IllegalStateException");
} catch (IllegalStateException ex) {
} // ok
}
}
@Test
public void test_remove_not_found() {
for (int i = 0; i < 3; i++) {
SinglyLinkedList<Integer> l1 = new SinglyLinkedList<Integer>();
SinglyLinkedList<Integer> l2 = new SinglyLinkedList<Integer>();
for (int j = 0; j < i; j++) {
l1.addLast(j);
l2.addLast(j);
}
assertFalse(l1.remove(999));
assertEquals(l2.toString(), l1.toString());
}
}
@Test
public void test_copy_list() {
SinglyLinkedList<Integer> l1 = new SinglyLinkedList<Integer>(new Integer[] { 1, 2, 3 });
SinglyLinkedList<Integer> l2 = new SinglyLinkedList<Integer>(l1);
assertNotEquals(l1, l2);
assertNotEquals(l1.head, l2.head);
assertEquals(l1.toString(), l2.toString());
}
@Test
public void test_remove_one_item() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1});
assertTrue(l.remove(1));
assertEquals("[]", l.toString());
assertNull(l.head);
assertNull(l.tail);
}
@Test
public void test_remove_two_items_first() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2});
assertTrue(l.remove(1));
assertEquals("[2]", l.toString());
}
@Test
public void test_remove_two_items_second() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2});
assertTrue(l.remove(2));
assertEquals("[1]", l.toString());
}
@Test
public void test_remove_two_items_both() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2});
assertTrue(l.remove(2));
assertTrue(l.remove(1));
assertEquals("[]", l.toString());
}
@Test
public void test_remove_three_items_first() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2, 3});
assertTrue(l.remove(1));
assertEquals("[2 -> 3]", l.toString());
l.addLast(4);
assertEquals("[2 -> 3 -> 4]", l.toString());
}
@Test
public void test_remove_three_items_second() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2, 3});
assertTrue(l.remove(2));
assertEquals("[1 -> 3]", l.toString());
l.addLast(4);
assertEquals("[1 -> 3 -> 4]", l.toString());
}
@Test
public void test_remove_three_items_third() {
SinglyLinkedList<Integer> l = new SinglyLinkedList<Integer>(new Integer[] {1, 2, 3});
assertTrue(l.remove(3));
assertEquals("[1 -> 2]", l.toString());
l.addLast(4);
assertEquals("[1 -> 2 -> 4]", l.toString());
}
}