refactor(i18n): 공급자 전환과 캐시 선택을 공통 처리로 연결한다

src/test/kotlin/kr/co/vividnext/sodalive/content/LanguageDetectionCacheServiceTest.kt

@@ -1,5 +1,8 @@
 package kr.co.vividnext.sodalive.content
 
+import kr.co.vividnext.sodalive.i18n.translation.DetectedLanguage
+import kr.co.vividnext.sodalive.i18n.translation.LanguageDetectionProvider
+import kr.co.vividnext.sodalive.i18n.translation.LanguageProviderProperties
 import kr.co.vividnext.sodalive.i18n.translation.SourceTextNormalizer
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.DisplayName
@@ -10,7 +13,8 @@ class LanguageDetectionCacheServiceTest {
     @Test
     fun shouldReuseCachedLanguageDetectionForSameNormalizedText() {
         val repository = Mockito.mock(LanguageDetectionResultRepository::class.java)
-        val service = LanguageDetectionCacheService(repository)
+        var providerCalls = 0
+        val service = service(repository) { providerCalls++; "ko" }
         val sourceHash = SourceTextNormalizer.hash("Hello world")
 
         Mockito.`when`(
@@ -30,13 +34,9 @@ class LanguageDetectionCacheServiceTest {
             )
         )
 
-        var providerCalls = 0
-        val detected = service.detectWithCache("Hello   world") {
-            providerCalls++
-            "ko"
-        }
+        val detected = service.detectWithCache("Hello   world")
 
-        assertEquals("en", detected)
+        assertEquals(DetectedLanguage("en", "papago"), detected)
         assertEquals(0, providerCalls)
         Mockito.verify(repository).findBySourceHashAndProviderAndNormalizationVersion(
             sourceHash = sourceHash,
@@ -50,7 +50,7 @@ class LanguageDetectionCacheServiceTest {
     @DisplayName("최초 캐시 저장 경합에서는 저장된 승자의 감지 언어를 반환한다")
     fun shouldReturnStoredWinnerAfterInitialCacheInsert() {
         val repository = Mockito.mock(LanguageDetectionResultRepository::class.java)
-        val service = LanguageDetectionCacheService(repository)
+        val service = service(repository) { "en" }
         val sourceHash = SourceTextNormalizer.hash("Hello world")
 
         Mockito.`when`(
@@ -78,9 +78,9 @@ class LanguageDetectionCacheServiceTest {
             )
         ).thenReturn("ko")
 
-        val detected = service.detectWithCache("Hello world") { "en" }
+        val detected = service.detectWithCache("Hello world")
 
-        assertEquals("ko", detected)
+        assertEquals(DetectedLanguage("ko", "papago"), detected)
         Mockito.verify(repository).findBySourceHashAndProviderAndNormalizationVersion(
             sourceHash = sourceHash,
             provider = "papago",
@@ -101,4 +101,12 @@ class LanguageDetectionCacheServiceTest {
         )
         Mockito.verifyNoMoreInteractions(repository)
     }
+
+    private fun service(repository: LanguageDetectionResultRepository, detect: () -> String?): LanguageDetectionCacheService {
+        val provider = object : LanguageDetectionProvider {
+            override val providerName = "papago"
+            override fun detect(query: String) = detect()
+        }
+        return LanguageDetectionCacheService(repository, listOf(provider), LanguageProviderProperties())
+    }
 }