public void Test_Calculate()
{
var testData = new Dictionary <uint, int>
{
{ 0, 1 },
{ 1, 3 },
{ 2, 7 },
{ 3, 15 },
{ 4, 31 },
{ 5, 63 },
{ 6, 127 },
{ 7, 255 },
{ 8, 500 },
{ 9, 500 }
};
var mockOp = new Mock <IOperation>();
var backoff = ExponentialBackoff.Create(100, 1, 500);
foreach (var data in testData)
{
var delay = backoff.CalculateBackoff(mockOp.Object);
Assert.Equal(data.Key, mockOp.Object.Attempts);
Assert.Equal(TimeSpan.FromMilliseconds(data.Value), delay);
}
}
public void Does_Not_Throw_On_Max_Retries()
{
var mockOp = new Mock <IOperation>();
var backoff = ExponentialBackoff.Create(10, 1, 500);
mockOp.SetupGet(op => op.Attempts).Returns(1_000_000);
var delay = backoff.CalculateBackoff(mockOp.Object);
Assert.Equal(TimeSpan.FromMilliseconds(500), delay);
}
public void Is_Not_Stateful()
{
// verify that the backoff is based on the number of attempts, not the number of times CalculateBackoff is called.
var mockOp = new Mock <IOperation>();
var backoff = ExponentialBackoff.Create(100, 1, 500);
mockOp.SetupGet(op => op.Attempts).Returns(2);
for (int i = 0; i < 1000; i++)
{
var delay = backoff.CalculateBackoff(mockOp.Object);
Assert.Equal(TimeSpan.FromMilliseconds(7), delay);
}
mockOp.SetupGet(op => op.Attempts).Returns(4);
for (int i = 0; i < 1000; i++)
{
var delay = backoff.CalculateBackoff(mockOp.Object);
Assert.Equal(TimeSpan.FromMilliseconds(31), delay);
}
}
public BestEffortRetryStrategy() :
this(ExponentialBackoff.Create(10, 1, 500))
{
}
