public async Task ShouldThrowIfCanceled(
IMetric <double> metric,
[Frozen, Substitute] IAmazonCloudWatch cloudwatch,
[Target] CloudWatchMetricReporter reporter
)
{
var cancellationToken = new CancellationToken(true);
Func <Task> func = () => reporter.Report(metric, cancellationToken);
await func.Should().ThrowAsync <OperationCanceledException>();
await cloudwatch.DidNotReceive().PutMetricDataAsync(Any <PutMetricDataRequest>(), Any <CancellationToken>());
}