public void Test_EnablingGoogleAnalytics()
{
var mail = BasicMailBuilder
.EnableGoogleAnalytics("source", "medium", "term", content: "content", campaign: "campaign")
.Build();
var message = new SendGridMessage();
message.EnableGoogleAnalytics("source", "medium", "term", content: "content", campaign: "campaign");
Assert.IsFalse(string.IsNullOrEmpty(message.Header.JsonString()));
Assert.AreEqual(message.Header.JsonString(), mail.Header.JsonString());
}