diff --git a/Heim/DataStorage/DataStorageModuleTests/LocalStorageTests.swift b/Heim/DataStorage/DataStorageModuleTests/LocalStorageTests.swift
new file mode 100644
index 0000000..7ba8458
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+++ b/Heim/DataStorage/DataStorageModuleTests/LocalStorageTests.swift
@@ -0,0 +1,106 @@
+//
+//  LocalStorageTests.swift
+//  DataStorageModule
+//
+//  Created by 김미래 on 12/5/24.
+//
+
+import XCTest
+@testable import DataStorageModule
+@testable import Domain
+
+final class LocalStorageTests: XCTestCase {
+
+  // MARK: - Properties
+  var localStorage: DefaultLocalStorage!
+  struct MockData: Codable, Equatable {
+    let name: String
+    let age: Int
+  }
+  let mockData = MockData(name: "Heim", age: 12)
+
+  // MARK: - TestCycle
+  override func setUp() {
+    super.setUp()
+
+    localStorage = DefaultLocalStorage()
+  }
+
+  override func tearDown() {
+    localStorage = nil
+
+    super.tearDown()
+  }
+
+  func test_saveData_success() async throws {
+    // given
+    let mockCalendarDate = CalendarDate(year: 2024, month: 12, day: 25, hour: 12, minute: 25, second: 25)
+    do {
+      // when
+      try await localStorage.saveData(calendarDate: mockCalendarDate,
+                                      data: mockData)
+    } catch(let error) {
+      guard error is StorageError else {
+        XCTFail("정의하지 않은 에러 발생")
+        return
+      }
+      XCTFail("StorageError발생")
+    }
+
+    do {
+      let result: [MockData] = try await localStorage.readData(calendarDate: mockCalendarDate)
+
+      // Then
+      XCTAssertEqual(result, [mockData])
+    } catch(let error) {
+      guard error is StorageError else {
+        XCTFail("정의하지 않은 에러 발생")
+        return
+      }
+      XCTFail("StorageError발생")
+    }
+  }
+
+  func test_deleteAll_sucess() async throws {
+    // given
+    let mockCalendarDate1 = CalendarDate(year: 2024, month: 12, day: 25, hour: 12, minute: 25, second: 25)
+    let mockCalendarDate2 = CalendarDate(year: 2024, month: 12, day: 26, hour: 12, minute: 23, second: 25)
+    let mockCalendarDate3 = CalendarDate(year: 2024, month: 12, day: 27, hour: 12, minute: 25, second: 25)
+
+    try await localStorage.saveData(calendarDate: mockCalendarDate1,
+                                    data: mockData)
+    try await localStorage.saveData(calendarDate: mockCalendarDate2,
+                                    data: mockData)
+    try await localStorage.saveData(calendarDate: mockCalendarDate3,
+                                    data: mockData)
+
+    // when
+    try await localStorage.deleteAll()
+
+    // then
+    let result: [MockData] = try await localStorage.readAll(directory: "/Diary")
+    XCTAssertEqual(result.count, 0)
+  }
+
+  func test_delete_success() async throws {
+    // given
+    let mockCalendarDate = CalendarDate(year: 2024, month: 12, day: 25, hour: 12, minute: 25, second: 25)
+    try await localStorage.saveData(calendarDate: mockCalendarDate,
+                                    data: mockData)
+
+    // when
+    try await localStorage.deleteData(calendarDate: mockCalendarDate)
+
+    // then
+    do {
+      let result: [MockData] = try await localStorage.readData(calendarDate: mockCalendarDate)
+      XCTAssertEqual(result.count, 0)
+    } catch(let error) {
+      guard let error = error as? StorageError else {
+        XCTFail("StorageError가 아님")
+        return
+      }
+      XCTAssertEqual(error, StorageError.readError)
+    }
+  }
+}