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BubbleSortTest.java
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package com.thealgorithms.sorts;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import java.util.Objects;
import org.junit.jupiter.api.Test;
/**
* @author Aitor Fidalgo (https://github.com/aitorfi)
* @see BubbleSort
*/
public class BubbleSortTest {
private BubbleSort bubbleSort = new BubbleSort();
@Test
public void bubbleSortEmptyArray() {
Integer[] inputArray = {};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortSingleIntegerElementArray() {
Integer[] inputArray = {4};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {4};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortSingleStringElementArray() {
String[] inputArray = {"s"};
String[] outputArray = bubbleSort.sort(inputArray);
String[] expectedOutput = {"s"};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortIntegerArray() {
Integer[] inputArray = {4, 23, -6, 78, 1, 54, 23, -6, -231, 9, 12};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {
-231,
-6,
-6,
1,
4,
9,
12,
23,
23,
54,
78,
};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortStringArray() {
String[] inputArray = {
"cbf",
"auk",
"ó",
"(b",
"a",
")",
"au",
"á",
"cba",
"auk",
"(a",
"bhy",
"cba",
};
String[] outputArray = bubbleSort.sort(inputArray);
String[] expectedOutput = {
"(a",
"(b",
")",
"a",
"au",
"auk",
"auk",
"bhy",
"cba",
"cba",
"cbf",
"á",
"ó",
};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortAlreadySortedArray() {
Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortReversedSortedArray() {
Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortAllEqualArray() {
Integer[] inputArray = {2, 2, 2, 2, 2};
Integer[] outputArray = bubbleSort.sort(inputArray);
Integer[] expectedOutput = {2, 2, 2, 2, 2};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
public void bubbleSortMixedCaseStrings() {
String[] inputArray = {"banana", "Apple", "apple", "Banana"};
String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
String[] outputArray = bubbleSort.sort(inputArray);
assertArrayEquals(expectedOutput, outputArray);
}
/**
* Custom Comparable class for testing.
**/
static class Person implements Comparable<Person> {
String name;
int age;
Person(String name, int age) {
this.name = name;
this.age = age;
}
@Override
public int compareTo(Person o) {
return Integer.compare(this.age, o.age);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Person person = (Person) o;
return age == person.age && Objects.equals(name, person.name);
}
@Override
public int hashCode() {
return Objects.hash(name, age);
}
}
@Test
public void bubbleSortCustomObjects() {
Person[] inputArray = {
new Person("Alice", 32),
new Person("Bob", 25),
new Person("Charlie", 28),
};
Person[] expectedOutput = {
new Person("Bob", 25),
new Person("Charlie", 28),
new Person("Alice", 32),
};
Person[] outputArray = bubbleSort.sort(inputArray);
assertArrayEquals(expectedOutput, outputArray);
}
}