RateDiscountPolicyTest 질문

package hello.core.discount; import hello.core.member.Grade; import hello.core.member.Member; import org.assertj.core.api.Assertions; import org.junit.jupiter.api.DisplayName; import org.junit.jupiter.api.Test; import static org.assertj.core.api.Assertions.*; import static org.junit.jupiter.api.Assertions.*; class RateDiscountPolicyTest { RateDiscountPolicy discountPolicy = new RateDiscountPolicy(); @Test @DisplayName("VIP는 10% 할인이 적용되어야 한다.") void vip_o() { //given new Member(1L,"memberVIP", Grade.VIP); //when int discount = discountPolicy.discount(member, 10000); //then assertThat(discount).isEqualTo(1000); } }