I was actually trying this code section in NUnit .

using NUnit.Framework;


namespace BlazorClientApp.Tests
{
    public class CounterTests
    {
        [Test]
        public void CounterComponent_ShouldHaveInitialCountZero()
        {
            var envVariable = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
            Assert.AreEqual("MyCheck", envVariable);
        }
    }
}

I have already referenced this nunit project with my blazor wasm project.
Here i was expecting that it will give me wasm environment variable but it’s returning null what could be the reason.