Refactor core data classes (#671)

passKitTests/CoreData/CoreDataTestCase.swift

@@ -0,0 +1,31 @@
+//
+//  CoreDataTestCase.swift
+//  pass
+//
+//  Created by Mingshen Sun on 1/4/25.
+//  Copyright © 2025 Bob Sun. All rights reserved.
+//
+
+import CoreData
+import Foundation
+import XCTest
+
+@testable import passKit
+
+// swiftlint:disable:next final_test_case
+class CoreDataTestCase: XCTestCase {
+    // swiftlint:disable:next test_case_accessibility
+    private(set) var controller: PersistenceController!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+
+        controller = PersistenceController(isUnitTest: true)
+        controller.setup()
+    }
+
+    override func tearDown() {
+        super.tearDown()
+        controller = nil
+    }
+}