test: Session 수강신청 테스트 수정

src/test/java/nextstep/courses/domain/SessionTest.java

@@ -2,21 +2,20 @@
 
 import java.util.List;
 
-import nextstep.users.domain.NsUserTest;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 class SessionTest {
 
-    public static final Session L1 = new Session(List.of(NsUserTest.JAVAJIGI));
+    public static final Session L1 = new Session(List.of(JoinUserTest.JAVAJIGI));
 
     @DisplayName("수강신청")
     @Test
     void 수강신청_기본기능() {
         Session session = new Session();
-        session.join(NsUserTest.JAVAJIGI);
+        session.join(JoinUserTest.JAVAJIGI);
         assertThat(session).isEqualTo(L1);
     }