in Sources/XCTest/Private/WallClockTimeMetric.swift [48:56]
func failureMessage() -> String? {
let relativeStandardDeviation = measurements.relativeStandardDeviation
if (relativeStandardDeviation > maxRelativeStandardDeviation &&
measurements.standardDeviation > standardDeviationNegligibilityThreshold) {
return String(format: "The relative standard deviation of the measurements is %.3f%% which is higher than the max allowed of %.3f%%.", relativeStandardDeviation, maxRelativeStandardDeviation)
}
return nil
}