C# 创建vnext测试项目时出错

使用VS2015预览版，我尝试创建一个测试项目（vnext库（dll））。使用来自的示例

//project.json

        {
        "version": "1.0.0-*",
        "dependencies": {
            "Xunit.KRunner": "1.0.0-beta1"
        },
        "commands": {
            "test": "Xunit.KRunner"
        },
        "frameworks": {
            "aspnet50": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            },
            "aspnetcore50": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            },
            "k10": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            }

        }
    }

我在错误窗口中得到这些错误，但测试确实正确运行。这是测试版中的一个bug，还是我的配置中遗漏了什么

• k10

  部分已弃用，不应位于

  project.json中

• aspnet50

  不需要

  System.Runtime

        {
        "version": "1.0.0-*",
        "dependencies": {
            "Xunit.KRunner": "1.0.0-beta1"
        },
        "commands": {
            "test": "Xunit.KRunner"
        },
        "frameworks": {
            "aspnet50": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            },
            "aspnetcore50": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            },
            "k10": {
                "dependencies": {
                    "System.Runtime": "4.0.20-beta-22231"
                }
            }

        }
    }