dotNet Core SDK 3.1.100 failing to restore because of bad versions

Issue Description

On a brand new install of dotNet Core SDK 3.1.100 for Windows 10 x64, It seems to be missing dependencies with the install. Should I need to include other feeds to get the dotnet restore to work after doing a dotnet new xunit? I was following this document: Organizing and testing projects with the .NET Core command line. Some of the references are a little old so maybe something changed?

Steps performed

dotnet new xunit
dotnet restore

System Information

C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests>systeminfo

Host Name:                 FENIX
OS Name:                   Microsoft Windows 10 Pro
OS Version:                10.0.18362 N/A Build 18362
OS Manufacturer:           Microsoft Corporation

dotnet Errors

C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests>dotnet restore 
Restore completed in 25.54 ms for C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\src\NewTypes\NewTypes.csproj.
C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests\NewTypesTests.csproj : error NU1100: Unable to resolve 'Microsoft.NET.Test.Sdk (>= 16.2.0)' for '.NETCoreApp,Version=v3.1'.
C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests\NewTypesTests.csproj : error NU1100: Unable to resolve 'xunit (>= 2.4.0)' for '.NETCoreApp,Version=v3.1'.
C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests\NewTypesTests.csproj : error NU1100: Unable to resolve 'xunit.runner.visualstudio (>= 2.4.0)' for '.NETCoreApp,Version=v3.1'.
C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests\NewTypesTests.csproj : error NU1100: Unable to resolve 'coverlet.collector (>= 1.0.1)' for '.NETCoreApp,Version=v3.1'.
  Restore failed in 150.83 ms for C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests\NewTypesTests.csproj.

dotnet information

C:\Users\Phillip\Desktop\dotNetCore\01_NewTypes\test\NewTypesTests>dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   3.1.100
 Commit:    cd82f021f4

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18362
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.1.100\

Host (useful for support):
  Version: 3.1.0
  Commit:  65f04fb6db

.NET Core SDKs installed:
  3.1.100 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.1.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

[FilBot3]

I used the following to get my dotnet nuget sources setup. Then it worked.

dotnet nuget add source --name nuget.org https://api.nuget.org/v3/index.json

Then the restore worked. Thank you coding|blocks community.

[mpaz-kaizentec]

I used the following to get my dotnet nuget sources setup. Then it worked.

dotnet nuget add source --name nuget.org https://api.nuget.org/v3/index.json

Then the restore worked. Thank you coding|blocks community.

It works!! thanks for share!!