public void TestAddSubVal()
{
var substitutionStrings = new List <String> {
"foo", "bar", "beer"
};
var mock = new Mock <IHeader>();
var sg = new SendGrid(mock.Object);
sg.AddSubVal("-name-", substitutionStrings);
mock.Verify(foo => foo.AddSubVal("-name-", substitutionStrings));
}
