public async void Should_Send_Emails_Simultaneously()
{
var email = new Email {
To = "George", Body = "Very Important!"
};
var tasks = new[] { _sut.SendEmail(email), _sut.SendEmail(email), _sut.SendEmail(email), _sut.SendEmail(email) };
await Task.WhenAll(tasks);
_mockClient.Verify(a => a.SendEmail(email.To, email.Body), Times.Exactly(4));
}
public async void Should_Send_Emails_SimultaneouslyWithConcreteClient()
{
var email = new Email {
To = "George", Body = "Very Important!"
};
var tasks = new[] { _sut2.SendEmail(email), _sut2.SendEmail(email), _sut2.SendEmail(email), _sut2.SendEmail(email) };
var results = await Task.WhenAll(tasks);
Assert.Equal(4, results.Length);
Assert.True(!results.ToList().Contains("Failure."));
}
public void Should_Send_Emails_to_Email_Client()
{
var email = new Email {
To = "George", Body = "Very Important!"
};
_sut.SendEmail(email);
_sut.SendEmail(email);
_sut.SendEmail(email);
_sut.SendEmail(email);
_mockClient.Verify(call => call.SendEmail(email.To, email.Body), Times.Exactly(4));
}
public void Should_Handle_Unexpected_Failure()
{
var email = new Email {
To = "George", Body = "Very Important!"
};
var _mockClient1 = new EmailClient(100);
var _eService = new EmailingService(_mockClient1, _mockLogger.Object);
int numFailure = 0;
Parallel.For(0, 20, i =>
{
try
{
_eService.SendEmail(email);
}
catch (Exception e)
{
if (e.Message.Contains("Unexpected Error"))
{
numFailure++;
}
}
});
Assert.True(numFailure > 0, "No Connection error found");
}
public void Should_Handle_Connection_Failure()
{
var email = new Email {
To = "George", Body = "Very Important!"
};
// assume maxConnections is 10, so that I can test boundary value using 11
var client = new EmailClient(10);
var _eService = new EmailingService(client, _mockLogger.Object);
int numFailure = 0;
// try concurrency within 5s to test the boundary value using 11
Parallel.For(0, 11, i =>
{
try
{
var res = _eService.SendEmail(email);
if (res == "Failure.")
{
numFailure++;
}
}
catch (Exception)
{
}
});
Assert.True(numFailure > 0, "No Connection error found");
}
