use Mutex

Author: swhitty

.github/workflows/build.yml

@@ -132,8 +132,8 @@ jobs:
       - name: Install Swift
         uses: SwiftyLab/setup-swift@latest
         with:
-          swift-version: "6.1.2"
-          visual-studio-components: Microsoft.VisualStudio.Component.Windows11SDK.22621
+          swift-version: "6.2"
+
       - name: Version
         run: swift --version
       - name: Build

Tests/IdentifiableContinuationTests.swift

@@ -29,7 +29,6 @@
 //  SOFTWARE.
 //
 
-#if canImport(Testing)
 @testable import IdentifiableContinuation
 import Foundation
 import Testing
@@ -283,4 +282,3 @@ private extension Actor {
 
     }
 }
-#endif

Tests/IdentifiableContinuationXCTests.swift

@@ -29,7 +29,7 @@
 //  SOFTWARE.
 //
 
-#if canImport(Testing)
+#if canImport(Darwin)
 @testable import IdentifiableContinuation
 import Testing