Test Isolation with dotnetcore, dotnet5, dotnet6

Question

Is it possible to run tests in isolation with dotnetcore, dotnet5, or dotnet6?

Suppose I have a class named TheStaticFoo - a no-frills - a minimum working example:

public class TheStaticFoo
{
    public TheStaticFoo() => Current = this;

    private static TheStaticFoo _current;

    public static TheStaticFoo Current
    {
        get => _current;

        private set
        {
            if (_current != null)
                throw new InvalidOperationException("Oh shucks, only one instance is allowed sorry!!!!");
            
            _current = value;
        }
    }
}

Any my tests around this:

public class UnitTest1
{
    private readonly TheStaticFoo foo;
    
    public UnitTest1() => foo = new TheStaticFoo();

    [Fact]
    public void Test1() => Assert.Equal(TheStaticFoo.Current, foo);
}

This runs perfectly fine.

But adding a second test fails as expected:

[Fact]
public void AddingThisFails() => Assert.Equal(TheStaticFoo.Current, foo);

This is because of the static not getting torn down between the test runs.

Is it possible to run the two tests in isolation without modifying TheStaticFoo? Here I am using xunit but this would apply hopefully to any other test framework.

I am not sure whether the AssemblyLoadContext is the way to go for this.

Test Isolation with dotnetcore, dotnet5, dotnet6

0 Answers0