CI: relax even more timing

Author: mickeyl

Tests/CornucopiaCoreTests/Logging/LogFile.swift

@@ -109,10 +109,13 @@ class Logging: XCTestCase {
         XCTAssertEqual(5, differencesInMs.count)
         let expectedDifferences = [100, 5.0, 50.0, 500.0, 1000.0]
         // CI runners can have significant scheduling delays, especially for short sleeps
+        // Very short sleeps (<10ms) are particularly unreliable on loaded systems
         for (index, difference) in differencesInMs.enumerated() {
             let expectedDifference = expectedDifferences[index]
-            let lowerBound = max(0.0, expectedDifference * 0.5)  // Allow 50% under
-            let upperBound = expectedDifference * 3.0  // Allow 3x over for CI
+            // Use more generous bounds for very short sleeps
+            let (lowerMultiplier, upperMultiplier) = expectedDifference < 10 ? (0.0, 10.0) : (0.3, 4.0)
+            let lowerBound = expectedDifference * lowerMultiplier
+            let upperBound = expectedDifference * upperMultiplier
             XCTAssert(difference >= lowerBound && difference <= upperBound,
                      "Difference \(difference)ms at index \(index) outside expected range [\(lowerBound), \(upperBound)]ms")
         }
@@ -179,10 +182,13 @@ class Logging: XCTestCase {
         XCTAssertEqual(5, differencesInMs.count)
         let expectedDifferences = [100, 5.0, 50.0, 500.0, 1000.0]
         // CI runners can have significant scheduling delays, especially for short sleeps
+        // Very short sleeps (<10ms) are particularly unreliable on loaded systems
         for (index, difference) in differencesInMs.enumerated() {
             let expectedDifference = expectedDifferences[index]
-            let lowerBound = expectedDifference * 0.5  // Allow 50% under
-            let upperBound = expectedDifference * 3.0  // Allow 3x over for CI
+            // Use more generous bounds for very short sleeps
+            let (lowerMultiplier, upperMultiplier) = expectedDifference < 10 ? (0.0, 10.0) : (0.3, 4.0)
+            let lowerBound = expectedDifference * lowerMultiplier
+            let upperBound = expectedDifference * upperMultiplier
             XCTAssert(difference >= lowerBound, "Difference \(difference)ms at index \(index) is less than expected \(lowerBound)ms")
             XCTAssert(difference <= upperBound, "Difference \(difference)ms at index \(index) is greater than expected \(upperBound)ms")
         }