Junit

@DisplayName("숫자 입력 테스트")
@Test
void testInput() { ... }

@BeforeEach
void setup() {
    testNumbers = new WinningNumbers("1,2,3,4,5,6");
}

@Nested
@DisplayName("Lotto 생성 테스트")
class DescribeConstructor { ... }

@ParameterizedTest
@ValueSource(strings = {"7", "8", "9"})
@DisplayName("숫자 입력")
void testNumbers(String value) { ... }

@ParameterizedTest
@MethodSource("normalNumbers")
void testNormalNumbers(List<Integer> inputs) {
    assertThat(new Lotto(inputs).getNumbers())
        .containsExactly(1, 2, 3, 4, 5, 6);
}

assertThatThrownBy(() -> new Lotto(List.of(1,2,3,4,5,6,7))).isInstanceOf(IllegalArgumentException.class);

assertThatIllegalArgumentException()
    .isThrownBy(() -> validator.parseNumber(data))
    .withMessageContaining(
        ErrorMessage.ERROR.getMessage()
        + ErrorMessage.NOTNUMBER.getMessage()
    );

assertThatCode(() -> new Lotto(inputs))
        .doesNotThrowAnyException();

assertThat(number).isBetween(0, 9);

assertThat(lotto.getNumbers())
        .containsExactly(1, 2, 3, 4, 5, 6);

assertSimpleTest(() -> {
    runException("0");
    assertThat(output()).contains("[ERROR]");
});

assertRandomNumberInRangeTest(
    () -> {
        int[] result = generator.returnArray(6);
        assertThat(result).containsExactly(1, 2, 3, 4, 5, 5);
    },
    1, 2, 3, 4, 5, 5
);

@DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores.class)
class LottoTest { ... }

@BeforeAll
static void init() { ... }

public class LottoAssert extends AbstractAssert<LottoAssert, Lotto> {
    public LottoAssert hasSize(int size) {
        isNotNull();
        if (actual.getNumbers().size() != size) {
            failWithMessage("Lotto size expected %d but was %d", size, actual.getNumbers().size());
        }
        return this;
    }
}

@ParameterizedTest
@CsvSource({
    "1, true",
    "2, false"
})
void testCsv(int input, boolean expected) { ... }

// given
Lotto lotto = new Lotto(List.of(1,2,3,4,5,6));

// when
int bonus = lotto.calculateBonus();

// then
assertThat(bonus).isEqualTo(0);