fix(dm): FCM DM payload 보존을 보정한다

app/src/test/java/kr/co/vividnext/sodalive/fcm/SodaFirebaseMessagingServiceSourceTest.kt

@@ -0,0 +1,41 @@
+package kr.co.vividnext.sodalive.fcm
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.io.File
+
+class SodaFirebaseMessagingServiceSourceTest {
+
+    @Test
+    fun `FCM notification extras는 DM chat_type과 기존 deep link 값을 보존한다`() {
+        val source = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/fcm/SodaFirebaseMessagingService.kt"
+        ).readText()
+
+        assertTrue(source.contains("messageData[\"chat_type\"]?.let { putString(\"chat_type\", it) }"))
+        assertTrue(source.contains("messageData[\"room_id\"]?.let { putString(\"room_id\", it) }"))
+        assertTrue(source.contains("messageData[\"message_id\"]?.let { putString(\"message_id\", it) }"))
+        assertTrue(source.contains("messageData[\"deep_link_value\"]?.let { putString(\"deep_link_value\", it) }"))
+    }
+
+    @Test
+    fun `FCM deepLink payload도 DM chat_type과 room_id를 extra bundle에 보존한다`() {
+        val source = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/fcm/SodaFirebaseMessagingService.kt"
+        ).readText()
+
+        val deepLinkBundleStart = source.indexOf("if (!deepLinkUrl.isNullOrBlank())")
+        val fallbackBundleStart = source.indexOf("} else {", deepLinkBundleStart)
+        val deepLinkBundleSource = source.substring(deepLinkBundleStart, fallbackBundleStart)
+
+        assertTrue(deepLinkBundleSource.contains("putString(\"deep_link\", deepLinkUrl)"))
+        assertTrue(deepLinkBundleSource.contains("messageData[\"chat_type\"]?.let { putString(\"chat_type\", it) }"))
+        assertTrue(deepLinkBundleSource.contains("messageData[\"room_id\"]?.let { putString(\"room_id\", it) }"))
+    }
+
+    private fun projectFile(relativePath: String): File {
+        val candidates = listOf(File(relativePath), File("../$relativePath"))
+        return candidates.firstOrNull { it.exists() }
+            ?: error("Project file not found: $relativePath")
+    }
+}