[Test] Fix unstable Backtracing unit test

carlpeto · carlpeto · commit 959dc1bdb76d · 2025-12-03T11:31:37.000Z
There was a problem in CrashWithThreads where it failed about 10% of the time. This fixes it.
rdar://165728982
diff --git a/test/Backtracing/CrashWithThreads.swift b/test/Backtracing/CrashWithThreads.swift
@@ -57,7 +57,7 @@ func spawnThread(_ shouldCrash: Bool) {
 
 let crashingThreadIndex = (1..<10).randomElement()
 
-for threadIndex in 0..<10 {
+for threadIndex in 1..<10 {
   spawnThread(threadIndex == crashingThreadIndex)
 }
 

Original file line number	Diff line number	Diff line change
`@@ -57,7 +57,7 @@ func spawnThread(_ shouldCrash: Bool) {`
`57`	`57`
`58`	`58`	`let crashingThreadIndex = (1..<10).randomElement()`
`59`	`59`
`60`		`-for threadIndex in 0..<10 {`
	`60`	`+for threadIndex in 1..<10 {`
`61`	`61`	`spawnThread(threadIndex == crashingThreadIndex)`
`62`	`62`	`}`
`63`	`63`