模拟器已打开时并行运行单元测试出现Could not launch Simulator.app错误

串行运行所有测试均可通过；未启动模拟器时并行运行单元测试，所有测试也能通过。但选中6个及以上测试同时运行时，测试导航器显示测试通过，却弹出“Test failed”覆盖层和“Could not launch Simulator.app”的弹窗。推测是模拟器已启动导致的bug，但不清楚为何会导致测试失败，请问有人遇到过这类问题吗？

错误详情 #

详情

无法启动Simulator.app。
域：DVTiPhoneSimulatorErrorDomain
代码：1
用户信息：{
    DVTErrorCreationDateKey = "2023-08-10 05:13:12 +0000";
    IDERunOperationFailingWorker = IDELaunchiPhoneSimulatorLauncher;
}
--
操作无法完成。(OSStatus错误 -600。)
域：NSOSStatusErrorDomain
代码：-600
--

分析事件：com.apple.dt.IDERunOperationWorkerFinished : {
    "device_model" = "iPhone15,2";
    "device_osBuild" = "16.4 (20E247)";
    "device_platform" = "com.apple.platform.iphonesimulator";
    "launchSession_schemeCommand" = Test;
    "launchSession_state" = 1;
    "launchSession_targetArch" = arm64;
    "operation_duration_ms" = 54;
    "operation_errorCode" = 1;
    "operation_errorDomain" = DVTiPhoneSimulatorErrorDomain;
    "operation_errorWorker" = IDELaunchiPhoneSimulatorLauncher;
    "operation_name" = IDERunOperationWorkerGroup;
    "param_consoleMode" = 0;
    "param_debugger_attachToExtensions" = 0;
    "param_debugger_attachToXPC" = 1;
    "param_debugger_type" = 3;
    "param_destination_isProxy" = 0;
    "param_destination_platform" = "com.apple.platform.iphonesimulator";
    "param_diag_MainThreadChecker_stopOnIssue" = 0;
    "param_diag_MallocStackLogging_enableDuringAttach" = 0;
    "param_diag_MallocStackLogging_enableForXPC" = 0;
    "param_diag_allowLocationSimulation" = 1;
    "param_diag_checker_tpc_enable" = 0;
    "param_diag_gpu_frameCapture_enable" = 3;
    "param_diag_gpu_shaderValidation_enable" = 0;
    "param_diag_gpu_validation_enable" = 1;
    "param_diag_memoryGraphOnResourceException" = 0;
    "param_diag_queueDebugging_enable" = 1;
    "param_diag_runtimeProfile_generate" = 0;
    "param_diag_sanitizer_asan_enable" = 0;
    "param_diag_sanitizer_tsan_enable" = 0;
    "param_diag_sanitizer_tsan_stopOnIssue" = 0;
    "param_diag_sanitizer_ubsan_stopOnIssue" = 0;
    "param_diag_showNonLocalizedStrings" = 0;
    "param_diag_viewDebugging_enabled" = 1;
    "param_diag_viewDebugging_insertDylibOnLaunch" = 0;
    "param_install_style" = 0;
    "param_launcher_UID" = 2;
    "param_launcher_allowDeviceSensorReplayData" = 0;
    "param_launcher_kind" = 0;
    "param_launcher_style" = 0;
    "param_launcher_substyle" = 0;
    "param_runnable_appExtensionHostRunMode" = 0;
    "param_runnable_productType" = "com.apple.product-type.tool";
    "param_testing_launchedForTesting" = 1;
    "param_testing_suppressSimulatorApp" = 0;
    "param_testing_usingCLI" = 0;
    "sdk_canonicalName" = "iphonesimulator16.4";
    "sdk_osVersion" = "16.4";
    "sdk_variant" = iphonesimulator;
}
--


系统信息

macOS版本13.4.1（内部版本22F82）
Xcode 14.3.1（21815）（内部版本14E300c）
时间戳：2023-08-10T13:13:12+08:00

解决思路 #

• 强制清理进程后重启：
  在终端执行以下命令关闭模拟器和Xcode，再重新打开测试：

  killall "Simulator"
  killall Xcode
  

• 重置模拟器状态：打开模拟器，选择菜单栏模拟器 -> 重置内容和设置，确认后重启模拟器再运行测试。
• 调整并行测试数量：在Xcode的scheme配置中，找到测试阶段的并行设置，将同时运行的测试数限制在5个以内，避免触发模拟器启动冲突。
• 升级/降级Xcode：该问题在Xcode 14.x版本中存在偶发案例，尝试升级到14.4及以上版本，或切换到稳定版14.3。
• 检查系统权限：前往系统设置 -> 隐私与安全性，确认Xcode和Simulator拥有必要的系统权限。

内容的提问来源于stack exchange，提问作者Tometoyou