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suixinkanTests/LoginViewModelTests.swift

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+//
+//  LoginViewModelTests.swift
+//  suixinkanTests
+//
+//  Created by Codex on 2026/6/20.
+//
+
+import XCTest
+@testable import suixinkan
+
+@MainActor
+/// 登录页 ViewModel 测试，覆盖手机号规范化、表单校验和偏好恢复。
+final class LoginViewModelTests: XCTestCase {
+    /// 测试 +86 手机号会被规范化为 11 位国内手机号。
+    func testNormalizeUsernameCountryCodeRemovesChinaPrefix() {
+        let viewModel = LoginViewModel()
+        viewModel.username = "+86 186 5185 7230"
+
+        viewModel.normalizeUsernameCountryCodeIfNeeded()
+
+        XCTAssertEqual(viewModel.username, "18651857230")
+        XCTAssertEqual(viewModel.normalizedUsername, "18651857230")
+        XCTAssertTrue(viewModel.isValidPhone)
+    }
+
+    /// 测试未勾选协议时登录校验返回隐私协议错误。
+    func testValidateForLoginRequiresPrivacyAgreement() {
+        let viewModel = LoginViewModel()
+        viewModel.username = "18651857230"
+        viewModel.password = "secret123"
+        viewModel.privacyChecked = false
+
+        XCTAssertEqual(viewModel.validateForLogin(), .privacyUnchecked)
+    }
+
+    /// 测试登录偏好只恢复手机号和协议状态，不恢复密码。
+    func testApplyPreferencesRestoresUsernameAndPrivacyOnly() {
+        let viewModel = LoginViewModel()
+        viewModel.password = "manual-password"
+
+        viewModel.applyPreferences(
+            LoginPreferences(
+                lastUsername: "18651857230",
+                privacyAgreementAccepted: true
+            )
+        )
+
+        XCTAssertEqual(viewModel.username, "18651857230")
+        XCTAssertTrue(viewModel.privacyChecked)
+        XCTAssertEqual(viewModel.password, "manual-password")
+    }
+}