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refactor: HammingDistance (#5404)

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* refactor: HammingDistance

* checkstyle: fix formatting

---------

Co-authored-by: alxkm <alx@alx.com>
This commit is contained in:
Alex Klymenko
2024-08-26 16:37:17 +02:00
committed by GitHub
parent d810a1d4da
commit c5b73ec742
2 changed files with 47 additions and 24 deletions
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30
src/test/java/com/thealgorithms/strings/HammingDistanceTest.java
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@ -3,22 +3,34 @@ package com.thealgorithms.strings;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.stream.Stream;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.CsvSource;
import org.junit.jupiter.params.provider.MethodSource;
public class HammingDistanceTest {
class HammingDistanceTest {
@Test
void testHammingDistance() throws Exception {
assertEquals(HammingDistance.calculateHammingDistance("", ""), 0);
assertEquals(HammingDistance.calculateHammingDistance("java", "java"), 0);
assertEquals(HammingDistance.calculateHammingDistance("karolin", "kathrin"), 3);
assertEquals(HammingDistance.calculateHammingDistance("kathrin", "kerstin"), 4);
assertEquals(HammingDistance.calculateHammingDistance("00000", "11111"), 5);
@ParameterizedTest
@CsvSource({"'', '', 0", "'java', 'java', 0", "'karolin', 'kathrin', 3", "'kathrin', 'kerstin', 4", "'00000', '11111', 5", "'10101', '10100', 1"})
void testHammingDistance(String s1, String s2, int expected) {
assertEquals(expected, HammingDistance.calculateHammingDistance(s1, s2));
}
@ParameterizedTest
@MethodSource("provideNullInputs")
void testHammingDistanceWithNullInputs(String input1, String input2) {
assertThrows(IllegalArgumentException.class, () -> HammingDistance.calculateHammingDistance(input1, input2));
}
private static Stream<Arguments> provideNullInputs() {
return Stream.of(Arguments.of(null, "abc"), Arguments.of("abc", null), Arguments.of(null, null));
}
@Test
void testNotEqualStringLengths() {
Exception exception = assertThrows(Exception.class, () -> HammingDistance.calculateHammingDistance("ab", "abc"));
Exception exception = assertThrows(IllegalArgumentException.class, () -> HammingDistance.calculateHammingDistance("ab", "abc"));
assertEquals("String lengths must be equal", exception.getMessage());
}
}