unit-testing - 这个单元测试中有太多的断言吗？

Question

这个单元测试中是否有太多断言？

[Fact]
public void Send_sends_an_email_message() {
    using (var server = new MockSmtpServer()) {
        server.Start();
        using (var client = new EmailClient("localhost")) {
            string from = "john.doe@example.com";
            IEnumerable<string> to = new[] { "jane.doe@example.com" };
            string subject = "Test";
            string body = "Test.";
            client.Send(from, to, subject, body);
            var session = server.Sessions.FirstOrDefault();
            Assert.NotNull(session);
            var message = session.Messages.FirstOrDefault();
            Assert.NotNull(message);
            Assert.NotNull(message.From);
            Assert.Equal(message.From.Address, "john.doe@example.com");
            Assert.NotNull(message.To);
            var recipient = message.To.FirstOrDefault();
            Assert.NotNull(recipient);
            Assert.Equal(recipient.Address, "jane.doe@example.com");
            Assert.Equal(message.Subject, "Test");
            Assert.Equal(message.Body, "Test.");
        }
    }
}

我认为这段代码不需要任何解释，但如果需要，请告诉我。

Answer 1

我尽量保持我的 UnitTests 相当小，一次只测试一件事。所以我可能会将不同的部分测试成单独的测试，例如

sendWillSendAnEmail ,

fromContainsSenderAddress ,

toContainsRecipientAddress ,

mailBodyContainsMailMessage ,

mailContainsSubject