<dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.junit.vintage</groupId>
        <artifactId>junit-vintage-engine</artifactId>
        <version>5.6.2</version>
        <scope>test</scope>
    </dependency>

 <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.6.2</version>
        <scope>test</scope>
    </dependency>

    @Test
    public void should_test_every_test() {
        //given when
        int expected = 6;
        int actual = 10 - 4;
        Object nullValue = null;

        //then
        assertEquals(expected, actual);
        assertFalse(true);
        assertNull(nullValue);
        assertTrue(false);
    }

    @Test
    @DisplayName("test assertAll")
    void should_test_every_test() {
        //given when
        int expected = 4;
        int actual = 2 + 2;
        Object nullValue = null;

        //then
        assertAll(
                "Assert All of these",
                () -> assertEquals(expected, actual),
                () -> assertFalse(nullValue == null),
                () -> assertNull(nullValue),
                () -> assertNotNull("Hello Word!"),
                () -> assertTrue(nullValue != null));
    }

    @Test(expected = BusinessException.class)
    public void should_throw_business_exception_when_student_name_length_more_than_10() {
        //given when
        StudentCommand.builder()
                      .name(RandomStringUtils.randomAlphanumeric(11))
                      .build();
    }
    
    @Test(expected = BusinessException.class)
    public void should_throw_business_exception_when_student_description_length_more_than_20() {
        //given when
        StudentCommand.builder()
                .name(RandomStringUtils.randomAlphanumeric(9))
                .description(RandomStringUtils.randomAlphanumeric(21))
                .build();
    }

    @Test
    public void should_validate_message_when_student_name_length_more_than_10() {
        //given when
        try {
            StudentCommand.builder()
                          .name(RandomStringUtils.randomAlphanumeric(11))
                          .build();
        } catch (BusinessException e) {
            assertEquals(e.getMessage(), "The length of student name exceed 10 chars.");
        }
    }

    @Test
    @DisplayName("It tests the length of student name should less than 10 chars")
    void should_throw_business_exception_when_student_name_length_more_than_10() {
        //given when
        BusinessException businessException = Assertions.assertThrows(BusinessException.class, this::buildStudentName);

        //then
        assertEquals(businessException.getMessage(), "The length of student name exceed 10 chars.");
    }

    private void buildStudentName() {
        StudentCommand.builder()
                .name(RandomStringUtils.randomAlphanumeric(11))
                .build();
    }

    @Test
    @DisplayName("It tests the length of student description should less than 20 chars")
    void should_throw_business_exception_when_student_description_length_more_than_20() {
        //given when
        BusinessException businessException = Assertions.assertThrows(BusinessException.class, this::buildStudentDescription);

        //then
        assertEquals(businessException.getMessage(), "The length of student name exceed 20 chars.");
    }

    private void buildStudentDescription() {
        StudentCommand.builder()
                .description(RandomStringUtils.randomAlphanumeric(21))
                .build();
    }