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- package org.insa.algo.utils;
-
- import static org.junit.Assert.assertEquals;
- import static org.junit.Assert.assertTrue;
-
- import java.util.Arrays;
- import java.util.stream.IntStream;
-
- import org.junit.Before;
- import org.junit.Test;
-
- public class BinaryHeapTest {
-
- class MutableInteger implements Comparable<MutableInteger> {
-
- // Actual value
- private int value;
-
- public MutableInteger(int value) {
- this.value = value;
- }
-
- /**
- * @return The integer value stored inside this MutableInteger.
- */
- public int get() {
- return this.value;
- }
-
- /**
- * Update the integer value stored inside this MutableInteger.
- *
- * @param value New value to set.
- */
- public void set(int value) {
- this.value = value;
- }
-
- @Override
- public int compareTo(MutableInteger other) {
- return Integer.compare(this.value, other.value);
- }
-
- };
-
- // Raw data arrays.
- private MutableInteger[] data1 = IntStream.range(0, 20).mapToObj(MutableInteger::new)
- .toArray(MutableInteger[]::new);
- private MutableInteger[] data2 = Arrays.stream(new int[] { 8, 1, 6, 3, 4, 5, 9 })
- .mapToObj(MutableInteger::new).toArray(MutableInteger[]::new);
-
- // Actual heap.
- private BinaryHeap<MutableInteger> heap1, heap2;
-
- @Before
- public void init() {
- // Create the range heap
- this.heap1 = new BinaryHeap<>();
- this.heap2 = new BinaryHeap<>();
-
- for (MutableInteger v: data1) {
- this.heap1.add(v);
- }
-
- for (MutableInteger v: data2) {
- this.heap2.add(v);
- }
- }
-
- @Test
- public void testInsert() {
- BinaryHeap<MutableInteger> heap = new BinaryHeap<>();
- int size = 0;
- for (MutableInteger x: data1) {
- heap.add(x);
- size += 1;
- assertEquals(heap.size(), size);
- }
- assertEquals(data1.length, heap.size());
-
- heap = new BinaryHeap<>();
- size = 0;
- for (MutableInteger x: data2) {
- heap.add(x);
- size += 1;
- assertEquals(heap.size(), size);
- }
- assertEquals(data2.length, heap.size());
- }
-
- @Test
- public void testDeleteMin() {
- // range 1 (sorted)
- int size = data1.length;
- assertEquals(heap1.size(), size);
- for (MutableInteger x: data1) {
- assertEquals(heap1.deleteMin(), x);
- size -= 1;
- assertEquals(heap1.size(), size);
- }
- assertEquals(heap1.size(), 0);
- assertTrue(heap1.isEmpty());
-
- // range 2 (was not sorted)
- MutableInteger[] range2 = Arrays.copyOf(data2, data2.length);
- Arrays.sort(range2);
- size = range2.length;
- assertEquals(heap2.size(), size);
- for (MutableInteger x: range2) {
- assertEquals(heap2.deleteMin().get(), x.get());
- size -= 1;
- assertEquals(heap2.size(), size);
- }
- assertEquals(heap2.size(), 0);
- assertTrue(heap2.isEmpty());
- }
-
- @Test
- public void testUpdate() {
- MutableInteger newMin = data2[data2.length - 1];
- newMin.set(0);
- heap2.update(newMin);
- assertEquals(heap2.findMin(), newMin);
- }
-
- }
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