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GnomeSortTest.java
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package com.thealgorithms.sorts;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import java.util.Objects;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
public class GnomeSortTest {
private GnomeSort gnomeSort = new GnomeSort();
@Test
@DisplayName("GnomeSort empty Array")
public void gnomeSortEmptyArray() {
Integer[] inputArray = {};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEmpty();
}
@Test
@DisplayName("GnomeSort single Integer Array")
public void singleIntegerArray() {
Integer[] inputArray = {4};
Integer[] expectedOutput = {4};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort non duplicate Integer Array")
public void gnomeSortNonDuplicateIntegerArray() {
Integer[] inputArray = {6, 3, 87, 99, 27, 4};
Integer[] expectedOutput = {3, 4, 6, 27, 87, 99};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort Integer Array with duplicates")
public void gnomeSortDuplicateIntegerArray() {
Integer[] inputArray = {6, 3, 87, 3, 99, 27, 4, 27};
Integer[] expectedOutput = {3, 3, 4, 6, 27, 27, 87, 99};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort negative Integer Array with duplicates")
public void gnomeSortNegativeDuplicateIntegerArray() {
Integer[] inputArray = {6, 3, -87, 3, 99, -27, 4, -27};
Integer[] expectedOutput = {-87, -27, -27, 3, 3, 4, 6, 99};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort single String Array")
public void singleStringArray() {
String[] inputArray = {"b"};
String[] expectedOutput = {"b"};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort non duplicate String Array")
public void gnomeSortNonDuplicateStringArray() {
String[] inputArray = {"He", "A", "bc", "lo", "n", "bcp", "mhp", "d"};
String[] expectedOutput = {"A", "He", "bc", "bcp", "d", "lo", "mhp", "n"};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort String Array with duplicates")
public void gnomeSortDuplicateStringArray() {
String[] inputArray = {"He", "A", "bc", "lo", "n", "bcp", "mhp", "bcp"};
String[] expectedOutput = {"A", "He", "bc", "bcp", "bcp", "lo", "mhp", "n"};
gnomeSort.sort(inputArray);
assertThat(inputArray).isEqualTo(expectedOutput);
}
@Test
@DisplayName("GnomeSort for sorted Array")
public void testSortAlreadySortedArray() {
Integer[] inputArray = {-12, -6, -3, 0, 2, 2, 13, 46};
Integer[] outputArray = gnomeSort.sort(inputArray);
Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
@DisplayName("GnomeSort for reversed sorted Array")
public void testSortReversedSortedArray() {
Integer[] inputArray = {46, 13, 2, 2, 0, -3, -6, -12};
Integer[] outputArray = gnomeSort.sort(inputArray);
Integer[] expectedOutput = {-12, -6, -3, 0, 2, 2, 13, 46};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
@DisplayName("GnomeSort for All equal Array")
public void testSortAllEqualArray() {
Integer[] inputArray = {2, 2, 2, 2, 2};
Integer[] outputArray = gnomeSort.sort(inputArray);
Integer[] expectedOutput = {2, 2, 2, 2, 2};
assertArrayEquals(outputArray, expectedOutput);
}
@Test
@DisplayName("GnomeSort String Array with mixed cases")
public void testSortMixedCaseStrings() {
String[] inputArray = {"banana", "Apple", "apple", "Banana"};
String[] expectedOutput = {"Apple", "Banana", "apple", "banana"};
String[] outputArray = gnomeSort.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
@DisplayName("GnomeSort Custom Object Array")
public void testSortCustomObjects() {
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 = gnomeSort.sort(inputArray);
assertArrayEquals(expectedOutput, outputArray);
}
}