class JiangchangDesktopError(Exception):
    """基类"""
    pass

class AppNotFoundError(JiangchangDesktopError):
    """Electron 可执行文件找不到时抛出"""
    pass

class ConnectionError(JiangchangDesktopError, ConnectionError):
    """连接桌面应用失败时抛出"""
    pass

class TimeoutError(JiangchangDesktopError, TimeoutError):
    """操作超时"""
    pass

class AssertError(JiangchangDesktopError):
    """断言失败时抛出，消息要包含期望值和实际值"""
    pass

class LaunchError(JiangchangDesktopError):
    """应用启动失败时抛出"""
    pass

class GatewayDownError(JiangchangDesktopError):
    """Gateway 在等待过程中被检测到已停止/退出时抛出，便于测试立刻失败而不是空等超时。"""
    pass