Refactor InMemoryDatabase and repository usage.

Author: gunkim

core/src/test/kotlin/io/github/gunkim/realworld/share/InMemoryDatabase.kt

@@ -1,11 +1,13 @@
 package io.github.gunkim.realworld.share
 
+import io.github.gunkim.realworld.domain.article.model.Article
 import io.github.gunkim.realworld.domain.article.model.ArticleId
+import io.github.gunkim.realworld.domain.user.model.User
 import io.github.gunkim.realworld.domain.user.model.UserId
 
 object InMemoryDatabase {
-    val users: MutableMap<UserId, Any> = mutableMapOf() // User 저장소
-    val articles: MutableMap<ArticleId, Any> = mutableMapOf() // Article 저장소
+    val users: MutableMap<UserId, User> = mutableMapOf() // User 저장소
+    val articles: MutableMap<ArticleId, Article> = mutableMapOf() // Article 저장소
 
     val followings: MutableMap<UserId, MutableSet<UserId>> = mutableMapOf()
     val favorites: MutableMap<ArticleId, MutableSet<UserId>> = mutableMapOf()

core/src/test/kotlin/io/github/gunkim/realworld/share/MockArticleRepository.kt

@@ -15,7 +15,7 @@ data class ArticleCountProjectionImpl(
 
 class MockArticleRepository : ArticleRepository {
     override fun save(article: Article): Article {
-        val updatedAuthor: User = InMemoryDatabase.users[article.author.id] as? User ?: article.author
+        val updatedAuthor: User = InMemoryDatabase.users[article.author.id] ?: article.author
         val updatedArticle = if (article is Article.Companion.Model) {
             article.copy(author = updatedAuthor)
         } else {
@@ -46,7 +46,7 @@ class MockArticleRepository : ArticleRepository {
         limit: Int,
         offset: Int,
     ): List<Article> {
-        var filtered = InMemoryDatabase.articles.values.toList().mapNotNull { it as? Article }
+        var filtered = InMemoryDatabase.articles.values.toList().map { it }
 
         if (tag != null) {
             filtered = filtered.filter { article ->
@@ -62,7 +62,7 @@ class MockArticleRepository : ArticleRepository {
 
         if (favoritedUsername != null) {
             val favoriter = InMemoryDatabase.users.values
-                .mapNotNull { it as? User }
+                .map { it }
                 .find { it.name == favoritedUsername }
             filtered = if (favoriter != null) {
                 filtered.filter { article ->
@@ -78,7 +78,7 @@ class MockArticleRepository : ArticleRepository {
 
     override fun findFeedArticles(userId: UserId, limit: Int, offset: Int): List<Article> {
         val followedUserIds = InMemoryDatabase.followings[userId] ?: emptySet()
-        val feedArticles = InMemoryDatabase.articles.values.toList().mapNotNull { it as? Article }
+        val feedArticles = InMemoryDatabase.articles.values.toList().map { it }
             .filter { article ->
                 followedUserIds.contains(article.author.id)
             }
@@ -100,7 +100,7 @@ class MockArticleRepository : ArticleRepository {
 
     override fun findBySlug(slug: Slug): Article? {
         return InMemoryDatabase.articles.values
-            .mapNotNull { it as? Article }
+            .map { it }
             .find { it.slug == slug }
     }
 }

core/src/test/kotlin/io/github/gunkim/realworld/share/MockUserRepository.kt

@@ -11,7 +11,7 @@ class MockUserRepository : UserRepository {
         InMemoryDatabase.users[user.id] = user
 
         if (existingUser != null) {
-            InMemoryDatabase.articles.replaceAll { articleId, article ->
+            InMemoryDatabase.articles.replaceAll { _, article ->
                 if (article.author.id == user.id) {
                     if (article is Article.Companion.Model) {
                         article.copy(author = user)
@@ -27,7 +27,6 @@ class MockUserRepository : UserRepository {
     }
 
     override fun follow(followerId: UserId, followeeId: UserId) {
-        // followerId가 followeeId를 팔로우하도록 followings 맵을 업데이트합니다.
         val followingSet = InMemoryDatabase.followings.getOrPut(followerId) { mutableSetOf() }
         followingSet.add(followeeId)
     }