public void GetSetExtension_Should_Throw_On_Null()
{
IResolveFieldContext context = null;
Should.Throw <ArgumentNullException>(() => context.GetExtension("e"));
Should.Throw <ArgumentNullException>(() => context.SetExtension("e", 1));
context = new ResolveFieldContext();
context.GetExtension("a").ShouldBe(null);
context.GetExtension("a.b.c.d").ShouldBe(null);
Should.Throw <ArgumentException>(() => context.SetExtension("e", 1));
}