public void Backoff_WithFastFirstEqualToTrue_ResultIsZero()
{
// Arrange
var initialDelay = TimeSpan.FromMilliseconds(1);
const int retryCount = 3;
const double factor = 2;
const bool fastFirst = true;
// Act
IEnumerable <TimeSpan> result = Backoff.Exponential(initialDelay, retryCount, factor, fastFirst);
// Assert
result.Should().NotBeNull();
result.Should().HaveCount(retryCount);
bool first = true;
foreach (TimeSpan timeSpan in result)
{
if (first)
{
timeSpan.Should().Be(TimeSpan.FromMilliseconds(0));
first = false;
}
else
{
timeSpan.Should().BeGreaterOrEqualTo(initialDelay);
}
}
}
public void Backoff_WithRetryEqualToZero_ResultIsEmpty()
{
// Arrange
var initialDelay = TimeSpan.FromMilliseconds(1);
const int retryCount = 0;
const double factor = 2;
const bool fastFirst = false;
// Act
IEnumerable <TimeSpan> result = Backoff.Exponential(initialDelay, retryCount, factor, fastFirst);
// Assert
result.Should().NotBeNull();
result.Should().BeEmpty();
}
public void Backoff_WithFactorLessThanZero_ThrowsException()
{
// Arrange
var initialDelay = TimeSpan.FromMilliseconds(1);
const int retryCount = 3;
const double factor = 0.99;
const bool fastFirst = false;
// Act
Action act = () => Backoff.Exponential(initialDelay, retryCount, factor, fastFirst);
// Assert
act.Should().Throw <ArgumentOutOfRangeException>()
.And.ParamName.Should().Be("factor");
}
public void Backoff_ResultIsInRange()
{
// Arrange
var initialDelay = TimeSpan.FromMilliseconds(10);
const int retryCount = 5;
const double factor = 2;
const bool fastFirst = false;
// Act
IEnumerable <TimeSpan> result = Backoff.Exponential(initialDelay, retryCount, factor, fastFirst);
// Assert
result.Should().NotBeNull();
result.Should().HaveCount(retryCount);
TimeSpan prev = TimeSpan.Zero;
foreach (TimeSpan timeSpan in result)
{
timeSpan.Should().BeGreaterThan(prev);
prev = timeSpan;
}
}