warning NETSDK1080: A PackageReference to Microsoft.AspNetCore.App is not necessary when targeting .NET Core 3.0 or higher

Question

How do I fix the nasty warning I'm getting when running .NET Core tests from a command line via dotnet test?

The dotnet --version returns back 3.1.101.

$ dotnet test
watch : Started
C:\Program Files\dotnet\sdk\3.1.101\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.DefaultItems.targets(151,5):
    warning NETSDK1080: A PackageReference to Microsoft.AspNetCore.App is not necessary when targeting
    .NET Core 3.0 or higher. If Microsoft.NET.Sdk.Web is used, the shared framework will be referenced automatically.
    Otherwise, the PackageReference should be replaced with a FrameworkReference.
    [C:\github\demo\Demo\SmartHome.API\SmartHome.API.csproj]
C:\Program Files\dotnet\sdk\3.1.101\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.DefaultItems.targets(151,5):
    warning NETSDK1080: A PackageReference to Microsoft.AspNetCore.App is not necessary when targeting
    .NET Core 3.0 or higher. If Microsoft.NET.Sdk.Web is used, the shared framework will be referenced automatically.
    Otherwise, the PackageReference should be replaced with a FrameworkReference.
    [C:\github\demo\Demo\SmartHome.API\SmartHome.API.csproj]
Test run for C:\github\demo\Demo\SmartHome.API.Test\bin\Debug\netcoreapp3.1\SmartHome.API.Test.dll(.NETCoreApp,Version=v3.1)
Microsoft (R) Test Execution Command Line Tool Version 16.3.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...

A total of 1 test files matched the specified pattern.

Here's what my SmartHome.API.Test.csproj looks like.

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>

    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FluentAssertions" Version="5.10.0" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
    <PackageReference Include="MongoDB.Driver" Version="2.10.1" />
    <PackageReference Include="xunit" Version="2.4.0" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
    <PackageReference Include="coverlet.collector" Version="1.0.1" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\SmartHome.API\SmartHome.API.csproj" />
    <ProjectReference Include="..\SmartHome.Models\SmartHome.API.Models.csproj" />
  </ItemGroup>

</Project>

And this is the SmartHome.API.csproj which seems to be the source of the issue.

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FluentValidation" Version="8.6.1" />
    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.8" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="3.1.1" />
    <PackageReference Include="MongoDB.Driver" Version="2.10.1" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\SmartHome.Models\SmartHome.API.Models.csproj" />
  </ItemGroup>

</Project>

Answer 1

Changing a package dependency from Microsoft.AspNetCore.App (2.2.8) into a FrameworkReference in the SmartHome.API.csproj solved the problem for me at the cost of introducing a new one.

Initial fix

+  <ItemGroup>                                                                                                                         
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />                                                                         
+  </ItemGroup>                                                                                                                        
+                                                                                                                                      
   <ItemGroup>                                                                                                                         
     <PackageReference Include="FluentValidation" Version="8.6.1" />                                                                   
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.2.8" />                                                           
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="3.1.1" />                                      
     <PackageReference Include="MongoDB.Driver" Version="2.10.1" />                                                                    
   </ItemGroup>                                                                                                                        

New warning

I started seeing a new warning:

C:\Program Files\dotnet\sdk\3.1.101\Sdks\Microsoft.NET.Sdk\targets\
  Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(39,5):
warning NETSDK1086: A FrameworkReference for 'Microsoft.AspNetCore.App' was 
  included in the project. This is implicitly referenced by the .NET SDK and you
  do not typically need to reference it from your project. For more information,
  see https://aka.ms/sdkimplicitrefs

Final fix

...so I ended up removing the "Microsoft.AspNetCore.App" reference altogether. Now the build is warning-free!

i.e. the file looks like this:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="FluentValidation" Version="8.6.1" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="3.1.1" />
    <PackageReference Include="MongoDB.Driver" Version="2.10.1" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\SmartHome.Models\SmartHome.API.Models.csproj" />
  </ItemGroup>

</Project>