如何通过模拟IUserService对我的reportcontroller进行单元测试

I have a controller:

我有一个控制器:

private readonly IUserService _userService;

    public ReportController ( IOptions<AppSettings> appSettings,
                              UserManager<ApplicationUser> userManager,
                              IUserService userService ) : base( appSettings, userManager ) {
        _userService = userService;
    }

    public async Task<ActionResult> Report ( string path ) {
        var currentUser = await GetCurrentUserAsync();
        var excludedItems = _userService.GetUserExcludedReportsById( currentUser.Id ).Select( er => er.Path );

        if ( string.IsNullOrEmpty( path ) || excludedItems.Any( path.Contains ) ) {
            return RedirectToAction( nameof(HomeController.Index), "Home" );
        }

        var customItems = _userService.GetUserCustomReportsById( currentUser.Id ).Select( er => er.Path );

        if ( path.Contains( AppSettings.CustomReportsFolderName ) && !customItems.Any( path.Contains ) ) {
            return RedirectToAction( nameof(HomeController.Index), "Home" );
        }


        var model = GetReportViewerModel( Request );
        model.Parameters.Clear();
        var dbname = _userService.GetDefaultDbName( (await GetCurrentUserAsync()).Id );
        model.Parameters.Add( "connectionStr", new[] {
            dbname
        } );
        model.ReportPath = path;
        model.ClientCredentialType = System.ServiceModel.HttpClientCredentialType.Ntlm;

        return View( "Report", model );
    }
}
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