From 2f39788af95267e5eac9eb7f1e88a21ae5530ac8 Mon Sep 17 00:00:00 2001
From: suheon <dreasm1234567890@gmail.com>
Date: Sat, 25 Apr 2026 14:58:03 +0900
Subject: [PATCH] =?UTF-8?q?DP-233:=20StringListConverter=20=EB=8B=A8?=
 =?UTF-8?q?=EC=9C=84=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20=EC=B6=94=EA=B0=80?=
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---
 .../config/StringListConverterTest.java       | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/test/java/com/devpick/global/config/StringListConverterTest.java

diff --git a/src/test/java/com/devpick/global/config/StringListConverterTest.java b/src/test/java/com/devpick/global/config/StringListConverterTest.java
new file mode 100644
index 0000000..a17152c
--- /dev/null
+++ b/src/test/java/com/devpick/global/config/StringListConverterTest.java
@@ -0,0 +1,76 @@
+package com.devpick.global.config;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StringListConverterTest {
+
+    private StringListConverter converter;
+
+    @BeforeEach
+    void setUp() {
+        converter = new StringListConverter();
+    }
+
+    @Test
+    @DisplayName("리스트를 JSON 문자열로 직렬화한다")
+    void convertToDatabaseColumn_validList_returnsJson() {
+        String result = converter.convertToDatabaseColumn(List.of("Spring", "Java"));
+
+        assertThat(result).isEqualTo("[\"Spring\",\"Java\"]");
+    }
+
+    @Test
+    @DisplayName("null 입력 시 null을 반환한다")
+    void convertToDatabaseColumn_null_returnsNull() {
+        assertThat(converter.convertToDatabaseColumn(null)).isNull();
+    }
+
+    @Test
+    @DisplayName("빈 리스트 입력 시 null을 반환한다")
+    void convertToDatabaseColumn_emptyList_returnsNull() {
+        assertThat(converter.convertToDatabaseColumn(List.of())).isNull();
+    }
+
+    @Test
+    @DisplayName("JSON 문자열을 리스트로 역직렬화한다")
+    void convertToEntityAttribute_validJson_returnsList() {
+        List<String> result = converter.convertToEntityAttribute("[\"Spring\",\"Java\"]");
+
+        assertThat(result).containsExactly("Spring", "Java");
+    }
+
+    @Test
+    @DisplayName("null DB 값은 빈 리스트를 반환한다")
+    void convertToEntityAttribute_null_returnsEmptyList() {
+        assertThat(converter.convertToEntityAttribute(null)).isEmpty();
+    }
+
+    @Test
+    @DisplayName("빈 문자열 DB 값은 빈 리스트를 반환한다")
+    void convertToEntityAttribute_blankString_returnsEmptyList() {
+        assertThat(converter.convertToEntityAttribute("   ")).isEmpty();
+    }
+
+    @Test
+    @DisplayName("잘못된 JSON은 빈 리스트를 반환한다")
+    void convertToEntityAttribute_invalidJson_returnsEmptyList() {
+        assertThat(converter.convertToEntityAttribute("not-json")).isEmpty();
+    }
+
+    @Test
+    @DisplayName("직렬화 후 역직렬화하면 원본과 동일하다")
+    void roundTrip_preservesData() {
+        List<String> original = List.of("IoC", "DI", "Spring Boot");
+
+        String json = converter.convertToDatabaseColumn(original);
+        List<String> result = converter.convertToEntityAttribute(json);
+
+        assertThat(result).isEqualTo(original);
+    }
+}