test: 키워드별 추천 포스트 엔티티 테스트

#1397

backend/src/test/java/wooteco/prolog/roadmap/domain/RecommendedPostTest.java

@@ -0,0 +1,49 @@
+package wooteco.prolog.roadmap.domain;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.SoftAssertions.assertSoftly;
+
+class RecommendedPostTest {
+
+    @Test
+    @DisplayName("삭제 기능 테스트")
+    void remove() {
+        //given
+        final RecommendedPost recommendedPost = new RecommendedPost(1L, "https://example.com", null);
+        final Keyword keyword = Keyword.createKeyword("이름", "설명", 1, 1, 1L, null);
+        recommendedPost.addKeyword(keyword);
+
+        //when
+        final Keyword before = recommendedPost.getKeyword();
+        recommendedPost.remove();
+        final Keyword after = recommendedPost.getKeyword();
+
+        //then
+        Assertions.assertAll(
+            () -> assertThat(before).isNotNull(),
+            () -> assertThat(after).isNull()
+        );
+
+    }
+
+    @Test
+    @DisplayName("소속 키워드를 추가한다")
+    void addKeyword() {
+        //given
+        final RecommendedPost post = new RecommendedPost("http://연어");
+        final Keyword keyword = Keyword.createKeyword("name", "description", 1, 1, 1L, null);
+
+        //when
+        post.addKeyword(keyword);
+
+        //then
+        assertSoftly(soft -> {
+            assertThat(post.getKeyword()).isEqualTo(keyword);
+            assertThat(keyword.getRecommendedPosts()).containsExactly(post);
+        });
+    }
+}