EulersFunctionTest.java

packagecom.thealgorithms.maths;

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

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

classEulersFunctionTest {

@ParameterizedTest
@MethodSource("provideNumbersForGetEuler")
voidtestGetEuler(intinput, intexpected) {
assertEquals(expected, EulersFunction.getEuler(input));
 }

@ParameterizedTest
@MethodSource("provideInvalidNumbersForGetEuler")
voidtestGetEulerThrowsExceptionForNonPositiveInput(intinput) {
assertThrows(IllegalArgumentException.class, () -> EulersFunction.getEuler(input));
 }

privatestaticStream<Arguments> provideNumbersForGetEuler() {
returnStream.of(Arguments.of(1, 1), Arguments.of(2, 1), Arguments.of(3, 2), Arguments.of(4, 2), Arguments.of(5, 4), Arguments.of(6, 2), Arguments.of(10, 4), Arguments.of(21, 12), Arguments.of(69, 44), Arguments.of(47, 46), Arguments.of(46, 22), Arguments.of(55, 40), Arguments.of(34, 16),
Arguments.of(20, 8), Arguments.of(1024, 512));
 }

privatestaticStream<Arguments> provideInvalidNumbersForGetEuler() {
returnStream.of(Arguments.of(0), Arguments.of(-1), Arguments.of(-10));
 }
}