Java/src/test/java/com/thealgorithms/strings/HammingDistanceTest.java at master · TheAlgorithms/Java · GitHub

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packagecom.thealgorithms.strings;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertThrows;

importjava.util.stream.Stream;
importorg.junit.jupiter.api.Test;
importorg.junit.jupiter.params.ParameterizedTest;
importorg.junit.jupiter.params.provider.Arguments;
importorg.junit.jupiter.params.provider.CsvSource;
importorg.junit.jupiter.params.provider.MethodSource;

classHammingDistanceTest {

@ParameterizedTest
@CsvSource({"'', '', 0", "'java', 'java', 0", "'karolin', 'kathrin', 3", "'kathrin', 'kerstin', 4", "'00000', '11111', 5", "'10101', '10100', 1"})
voidtestHammingDistance(Strings1, Strings2, intexpected) {
assertEquals(expected, HammingDistance.calculateHammingDistance(s1, s2));
 }

@ParameterizedTest
@MethodSource("provideNullInputs")
voidtestHammingDistanceWithNullInputs(Stringinput1, Stringinput2) {
assertThrows(IllegalArgumentException.class, () -> HammingDistance.calculateHammingDistance(input1, input2));
 }

privatestaticStream<Arguments> provideNullInputs() {
returnStream.of(Arguments.of(null, "abc"), Arguments.of("abc", null), Arguments.of(null, null));
 }

@Test
voidtestNotEqualStringLengths() {
Exceptionexception = assertThrows(IllegalArgumentException.class, () -> HammingDistance.calculateHammingDistance("ab", "abc"));
assertEquals("String lengths must be equal", exception.getMessage());
 }
}