| package org.onlab.graph; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Ordering; |
| import com.google.common.testing.EqualsTester; |
| import org.junit.Test; |
| |
| import java.util.ArrayList; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| |
| import static org.junit.Assert.*; |
| |
| /** |
| * Heap data structure tests. |
| */ |
| public class HeapTest { |
| |
| private ArrayList<Integer> data = |
| new ArrayList<>(ImmutableList.of(6, 4, 5, 9, 8, 3, 2, 1, 7, 0)); |
| |
| private static final Comparator<Integer> ASCENDING = Ordering.natural().reverse(); |
| private static final Comparator<Integer> DESCENDING = Ordering.natural(); |
| |
| @Test |
| public void equality() { |
| new EqualsTester() |
| .addEqualityGroup(new Heap<>(data, ASCENDING), |
| new Heap<>(data, ASCENDING)) |
| .addEqualityGroup(new Heap<>(data, DESCENDING)) |
| .testEquals(); |
| } |
| |
| @Test |
| public void ascending() { |
| Heap<Integer> h = new Heap<>(data, ASCENDING); |
| assertEquals("incorrect size", 10, h.size()); |
| assertFalse("should not be empty", h.isEmpty()); |
| assertEquals("incorrect extreme", (Integer) 0, h.extreme()); |
| |
| for (int i = 0, n = h.size(); i < n; i++) { |
| assertEquals("incorrect element", (Integer) i, h.extractExtreme()); |
| } |
| assertTrue("should be empty", h.isEmpty()); |
| } |
| |
| @Test |
| public void descending() { |
| Heap<Integer> h = new Heap<>(data, DESCENDING); |
| assertEquals("incorrect size", 10, h.size()); |
| assertFalse("should not be empty", h.isEmpty()); |
| assertEquals("incorrect extreme", (Integer) 9, h.extreme()); |
| |
| for (int i = h.size(); i > 0; i--) { |
| assertEquals("incorrect element", (Integer) (i - 1), h.extractExtreme()); |
| } |
| assertTrue("should be empty", h.isEmpty()); |
| } |
| |
| @Test |
| public void empty() { |
| Heap<Integer> h = new Heap<>(new ArrayList<Integer>(), ASCENDING); |
| assertEquals("incorrect size", 0, h.size()); |
| assertTrue("should be empty", h.isEmpty()); |
| assertNull("no item expected", h.extreme()); |
| assertNull("no item expected", h.extractExtreme()); |
| } |
| |
| @Test |
| public void insert() { |
| Heap<Integer> h = new Heap<>(data, ASCENDING); |
| assertEquals("incorrect size", 10, h.size()); |
| h.insert(3); |
| assertEquals("incorrect size", 11, h.size()); |
| } |
| |
| @Test |
| public void iterator() { |
| Heap<Integer> h = new Heap<>(data, ASCENDING); |
| Iterator<Integer> it = h.iterator(); |
| while (it.hasNext()) { |
| int item = it.next(); |
| } |
| } |
| |
| } |