How to fix: NUnit unit tests not showing up in testing pad in Visual Studio Community (Mac)

Question

In spite of adding NUnit from NuGet to an existing .Net Core project, no unit tests are being shown in the Test Pad.

Note: I posted these images as links because I have too low of a reputation to post images. What's up with that?

1. Project > Add NuGet Packages...
2. Selected NUnit Package (3.11.0) and clicked "Add Package"
3. Checked to see if added to solution
4. Created a new empty class file within the solution
5. Added tests to this class
6. No tests show up in the test pad

I've tried restarting Visual Studio and reinstalling the package.

I've also tried deleting the Project/obj directory -- still no luck.

using NUnit.Framework;
namespace ExampleLib
{
    [TestFixture]
    public class ExampleTestFixture
    {
        [Test]
        public void ExampleTest()
        {
            Assert.AreEqual(2, 2);
        }
    }
}

Expected: Tests fill the Unit Test pad Actual: Empty test pad.

Answer 1

There are multiple requirements of that project, so that VS for Mac can identify and execute the test cases.

1. The project must be a console application of .NET Core.
2. The project must have a reference of Microsoft.NET.Test.Sdk (required by VSTest infrastructure).
3. The project must have a reference of NUnit.
4. The project must have a reference of NUnit3TestAdapter (required by VSTest infrastructure).

Example,

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.2</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="NUnit" Version="3.11.0" />
    <PackageReference Include="NUnit3TestAdapter" Version="3.12.0" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
  </ItemGroup>
</Project>

Note that VS for Windows and VS for Mac (and JetBrains Rider) all use VSTest for unit testing, so this setup works for all such IDEs.

Also note that if you didn't create this console project from dotnet new nunit, but a normal console application template, you need to manually delete the Main method.