Force developers to write tests

I want to add a method in an interface that will execute tests which correspond to the implementing class.

Is it possible to "force" a programmer to write tests without him / her working around it?

For example:

public interface ISomeInterface
{
    int SomeCalculationMethod();

    IEnumerable<SomeCustomTestResult> Tests();
}

public class SomeClass : ISomeInterface
{
    public int SomeCalculationMethod()
    {
        var someInt = 1;

        var someCalculation = someInt + someInt;

        return someCalculation;
    }

    public IEnumerable<SomeCustomTestResult> Tests()
    {
        var iDontWantToWriteTests = new List<SomeCustomTestResult> {
            new SomeCustomTestResult { 
                Success = true 
            } 
        };

        return iDontWantToWriteTests;
    }
}

public class SomeCustomTestResult
{
    public bool Success { get; set; }
}