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How do you fix 'Failed to load the dll hostfxr.dll' when starting an x86 .NET process in a test run via dotnet test?

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How do you fix the error 'Failed to load the DLL hostfxr.dll' when running a .NET test executed via dotnet test and starting an x86 .NET application in the test?

I'm using .NET 8.

Failed to load the dll from [C:\Program Files\dotnet\host\fxr\8.0.4\hostfxr.dll], HRESULT: 0x800700C1
The library hostfxr.dll was found, but loading it from C:\Program Files\dotnet\host\fxr\8.0.4\hostfxr.dll failed
  - Installing .NET prerequisites might help resolve this problem.
     https://go.microsoft.com/fwlink/?linkid=798306
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1 answer

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Remove DOTNET_ROOT environment variable before process start

process.StartInfo.EnvironmentVariables.Remove("DOTNET_ROOT");

Another option is to use the x86 .NET SDK for running the tests:

& "C:\Program Files (x86)\dotnet\dotnet" test

Source: https://github.com/dotnet/sdk/issues/22647#issuecomment-973898754

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