I only get partially coverage, not sure what is wrong?

[mouless]

Hello!

I get the following report: "Partially covered (4 visits, 1 of 2 branches are covered)" for the line: return from < to; and I cannot figure out why I don't get full coverage?

I have a very simple method:

public static bool IsValidFromTo(DateTimeOffset? from, DateTimeOffset? to)
{
    if (from.HasValue && to.HasValue)
    {
        return from < to;
    }

    return true;
}

I have written the following test:

1. Both from and to are null.
2. from is null and to is not null.
3. from is not null and to is null.
4. Both from and to are not null, and from is less than to.
5. Both from and to are not null, and from is greater than to.
6. Both from and to are not null, and from is equal to to. 
7. Both from and to are not null, and from is equal to to, but they are different instances of DateTimeOffset.

I get full coverage for the rest of the method.