Asp.net mvc 3 通过TestHelper测试路由contstraint

我有下一条路线

routes.MapRoute("Companies", "Companies/{companyId}",
    new { controller = "Company", action = "Details" },
    new { companyId = @"\d+" });

下面是测试它的测试

"~/Companies/7".ShouldMapTo<CompanyController>(action => action.Details(7));

“~/companys/7.ShouldMapTo（action=>action.Details（7））；

现在我想测试约束。所以url“~/companys/df”不应该映射到控制器

有人知道如何测试它吗？

可能是

"~/Companies/df".ShouldBeIgnored();