Question: why not add `IsTestProject` to project property when create a test project?

As the title, why not add <IsTestProject>true</IsTestProject> to the test project, it seemed the ci platform like azure devops and travis will not run the test when no <IsTestProject>true</IsTestProject> specified

[giggio]

I have found the solution for this problem. This is my scenario:

1. I’m running in a CI machine
2. It does not have a cache for packages, so there is no ~/.nuget directory
3. I have all the binaries available, restored from an artifact

If I run this, it fails:

dotnet test --configuration Release --list-tests --nologo --no-build

If I dotnet restore, then run it, it works.

I with I did not have to restore again. Adding <IsTestProject>true</IsTestProject> works, too.

Not having the package at ~\.nuget\packages\microsoft.net.test.sdk\17.2.0\build\netcoreapp2.1\ is making it not find the .targets and .props files, I guess.

[mjolka]

I ran into this problem when building the project as root and trying to run the tests as a non-root user.

I believe the problem comes down to Microsoft.NET.Test.Sdk.props being unreadable by the user trying to run the tests, as it’s under /root.

A workaround is setting NUGET_PACKAGES to /tmp/.nuget/packages.

To see the issue:

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
RUN dotnet new xunit --name TestProject --output . --no-restore
ARG NUGET_PACKAGES
ENV NUGET_PACKAGES=${NUGET_PACKAGES}
RUN dotnet restore TestProject.csproj
RUN dotnet build TestProject.csproj --configuration Release --output /app/build --no-restore

Running the tests as root works:

$ docker build -t issue-3790 --quiet .
sha256:02b63fadacaf72fd215a105dcdf366d36c58eef08f0e9618a732cede18df7d6d
$ docker run --rm issue-3790 dotnet test --no-build --output /app/build
Test run for /app/build/TestProject.dll (.NETCoreApp,Version=v6.0)
Microsoft (R) Test Execution Command Line Tool Version 17.2.0 (x64)
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.

Passed!  - Failed:     0, Passed:     1, Skipped:     0, Total:     1, Duration: < 1 ms - /app/build/TestProject.dll (net6.0)
$ 

Running the tests as a non-root user gives no output:

$ docker run --rm --user 1000 -e DOTNET_CLI_HOME=/tmp issue-3790 dotnet test --no-build --output /app/build
$ 

But if you set NUGET_PACKAGES=/tmp/.nuget/packages, you get this:

$ docker build -t issue-3790 --quiet --build-arg NUGET_PACKAGES=/tmp/.nuget/packages . 
sha256:655c8e20298adcf7fa8f187c4c66f2189d1c5fab7e2aa356b09c60d8f86521c2
$ docker run --rm --user 1000 -e DOTNET_CLI_HOME=/tmp issue-3790 dotnet test --no-build --output /app/build
Test run for /app/build/TestProject.dll (.NETCoreApp,Version=v6.0)
Microsoft (R) Test Execution Command Line Tool Version 17.2.0 (x64)
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.

Passed!  - Failed:     0, Passed:     1, Skipped:     0, Total:     1, Duration: < 1 ms - /app/build/TestProject.dll (net6.0)
$