public void EmailComposer_Build_HasEmptyTo_ShouldThrowException()
{
EmailComposer composer = new EmailComposer();
Assert.ThrowsException <ArgumentNullException>(
() => composer.SetFrom("*****@*****.**").SetSubject("Hello world").SetBody("Test").Build());
}
public void EmailComposer_Build_HasEmptySubject_ShouldThrowException()
{
EmailComposer composer = new EmailComposer();
Assert.ThrowsException <ArgumentNullException>(
() => composer.SetFrom("*****@*****.**").Build());
}