[feat] KeyChain Test 추가

FLINT/Data/Sources/Networking/TokenStorage/TokenStorage.swift

@@ -54,10 +54,11 @@ public final class DefaultTokenStorage: TokenStorage {
         // 기존 항목 삭제 후 새로운 항목 저장
         SecItemDelete(query as CFDictionary)
         let status = SecItemAdd(query as CFDictionary, nil)
-        if status == errSecSuccess {
-            Log.d("Keychain \(type.rawValue) 저장 완료")
+        guard status == errSecSuccess else {
+            Log.e("Keychain \(type.rawValue) save failed: \(SecCopyErrorMessageString(status, nil) as String? ?? "unknown")")
+            return
         }
-        Log.e(status)
+        Log.d("Keychain \(type.rawValue) saved.")
     }
 
     public func load(type: TokenType) -> String? {
@@ -76,6 +77,7 @@ public final class DefaultTokenStorage: TokenStorage {
             Log.e("Keychain \(type.rawValue) load failed. \(status)")
             return nil
         }
+        Log.e("Keychain \(type.rawValue) load failed: \(SecCopyErrorMessageString(status, nil) as String? ?? "unknown")")
         guard let data = item as? Data else {
             Log.e("Keychain \(type.rawValue) data invalid")
             return nil
@@ -97,9 +99,10 @@ public final class DefaultTokenStorage: TokenStorage {
         let status = SecItemDelete(query as CFDictionary)
 
         guard status == errSecSuccess else {
-            Log.e("Keychain \(type.rawValue) delete failed. \(status)")
+            Log.e("Keychain \(type.rawValue) delete failed: \(SecCopyErrorMessageString(status, nil) as String? ?? "unknown")")
             return
         }
+        Log.d("Keychain \(type.rawValue) deleted.")
     }
 
     public func clearAll() {

FLINT/FLINTTests/KeyChainTests.swift

@@ -0,0 +1,94 @@
+//
+//  KeyChainTests.swift
+//  FLINTTests
+//
+//  Created by 김호성 on 2026.01.27.
+//
+
+import XCTest
+@testable import Data
+@testable import FLINT
+
+final class KeyChainTests: XCTestCase {
+
+    private var tokenStorage: TokenStorage!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+
+        tokenStorage = DefaultTokenStorage()
+        tokenStorage.clearAll()
+//        tokenStorage = TestTokenStorage()
+    }
+
+    override func tearDownWithError() throws {
+        tokenStorage.clearAll()
+        tokenStorage = nil
+
+        try super.tearDownWithError()
+    }
+
+    func testSaveAndLoadAccessToken() throws {
+        let token = "access_token_00"
+
+        tokenStorage.save(token, type: .accessToken)
+        let loadedToken = tokenStorage.load(type: .accessToken)
+
+        XCTAssertEqual(token, loadedToken)
+    }
+    func testSaveAndLoadTempToken() throws {
+        let token = "temp_token_00"
+
+        tokenStorage.save(token, type: .tempToken)
+        let loadedToken = tokenStorage.load(type: .tempToken)
+
+        XCTAssertEqual(token, loadedToken)
+    }
+    func testSaveAndLoadRefreshToken() throws {
+        let token = "refresh_token_00"
+
+        tokenStorage.save(token, type: .refreshToken)
+        let loadedToken = tokenStorage.load(type: .refreshToken)
+
+        XCTAssertEqual(token, loadedToken)
+    }
+
+    func testLoadWithoutSaving() {
+        let loadedToken = tokenStorage.load(type: .accessToken)
+
+        XCTAssertNil(loadedToken)
+    }
+
+    func testDelete() {
+        let token = "access_token_01"
+        tokenStorage.save(token, type: .accessToken)
+
+        tokenStorage.delete(type: .accessToken)
+
+        let loadedToken = tokenStorage.load(type: .accessToken)
+        XCTAssertNil(loadedToken)
+    }
+
+    func testSaveOverridesExistingToken() {
+        let oldToken = "access_token_02"
+        let newToken = "access_token_03"
+
+        tokenStorage.save(oldToken, type: .accessToken)
+        tokenStorage.save(newToken, type: .accessToken)
+
+        let loadedToken = tokenStorage.load(type: .accessToken)
+        XCTAssertEqual(newToken, loadedToken)
+    }
+
+    func testClearAll() {
+        tokenStorage.save("access_token_04", type: .accessToken)
+        tokenStorage.save("refresh_token_01", type: .refreshToken)
+        tokenStorage.save("temp_token_01", type: .tempToken)
+
+        tokenStorage.clearAll()
+
+        XCTAssertNil(tokenStorage.load(type: .accessToken))
+        XCTAssertNil(tokenStorage.load(type: .refreshToken))
+        XCTAssertNil(tokenStorage.load(type: .tempToken))
+    }
+}