From bc88adeba06110cbc32f22e949eadd17614d8b45 Mon Sep 17 00:00:00 2001
From: Marc Prud'hommeaux <marc@skip.tools>
Date: Sun, 5 Jan 2025 15:14:32 -0500
Subject: [PATCH] Check for environment XCTEST_MEASURE_MAX_STDDEV for
 maxRelativeStandardDeviation

---
 Sources/XCTest/Private/WallClockTimeMetric.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sources/XCTest/Private/WallClockTimeMetric.swift b/Sources/XCTest/Private/WallClockTimeMetric.swift
index 2fe945a346..64361647b1 100644
--- a/Sources/XCTest/Private/WallClockTimeMetric.swift
+++ b/Sources/XCTest/Private/WallClockTimeMetric.swift
@@ -30,7 +30,7 @@ internal final class WallClockTimeMetric: PerformanceMetric {
         measurements.append(stopTime-startTime)
     }
 
-    private let maxRelativeStandardDeviation = 10.0
+    private let maxRelativeStandardDeviation = ProcessInfo.processInfo.environment["XCTEST_MEASURE_MAX_STDDEV"].flatMap({ Double($0) }) ?? 10.0
     private let standardDeviationNegligibilityThreshold = 0.1
 
     func calculateResults() -> String {