<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-params</artifactId>
    <version>5.7.0</version>
    <scope>test</scope>
</dependency>

testCompile("org.junit.jupiter:junit-jupiter-params:5.7.0")

public Class Example{
 private set<Integer> numbers;

    @BeforeEach
   void setUp() {
        numbers = new HashSet<>();
        numbers.add(1);
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
    }
}

@Test
     @DisplayName("numbers 1,2,3 값이 존재하는지 확인")
     void contains() {
         assertThat(numbers.contains(1)).isTrue();
         assertThat(numbers.contains(2)).isTrue();
         assertThat(numbers.contains(3)).isTrue();
     }

@ParameterizedTest
    @ValueSource(ints = {1,2,3})
    @DisplayName("numbers 1,2,3 값이 존재하는지 확인(중복제거)")
    void is_SouldContainsNumberOneTwoThree(int num){
        assertThat(numbers.contains(num)).isTrue();
    }

@DisplayName("요구사항3) 1,2,3 값이면 Ture, 4,5면 Flase 반환")
    @ParameterizedTest
    @CsvSource(value = {"1,true","2,true","3,true","4,false","5,false"})
    void contains_TrueOrFalse(int num, boolean expected) {
        assertThat(numbers.contains(num)).isEqualTo(expected);
    }

@CsvSource(value = {"1:true","2:true","3:true","4:false","5:false"}, delimiter = ':')