Unit Test Coverage is being pedantic

Question

I'm using the Analyse Code Coverage tool in Visual Studio 2012. The report appears to be very pedantic about what is covered and I have no idea what else could be done to provide more coverage.

The code I am testing is this:

public class Factory<T> : IFactory<T> where T : new()
{
    public T Create()
    {
        return new T();  // This line has only partial coverage.
    }
}

The unit tests:

using System;
using Xunit;
public class Factory_Tests
{
    [Fact]
    public void Constructor_Works()
    {
        var target = new Factory<Exception>();
    }

    [Fact]
    public void Create_ReturnsNewValue()
    {
        var target = new Factory<Exception>();
        var actual = target.Create();
        Assert.NotNull(actual);
    }
}

The report claims that the line commented above has only partial coverage. What could I have possibly failed to test on this line?

Answer 1

Since it is a generic method that can accept both a reference type and a value type, it wants you test it with both.