diff --git a/Sources/_InternalTestSupport/SkippedTestSupport.swift b/Sources/_InternalTestSupport/SkippedTestSupport.swift
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+++ b/Sources/_InternalTestSupport/SkippedTestSupport.swift
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+
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
+ Licensed under Apache License v2.0 with Runtime Library Exception
+
+ See http://swift.org/LICENSE.txt for license information
+ See http://swift.org/CONTRIBUTORS.txt for Swift project authors
+ */
+
+import class Foundation.FileManager
+import class Foundation.ProcessInfo
+import Testing
+
+extension Trait where Self == Testing.ConditionTrait {
+    /// Skip test if the host operating system does not match the running OS.
+    public static func requireHostOS(_ os: OperatingSystem, when condition: Bool = true) -> Self {
+        enabled("This test requires a \(os) host OS.") {
+            ProcessInfo.hostOperatingSystem == os && condition
+        }
+    }
+
+    /// Skip test if the host operating system matches the running OS.
+    public static func skipHostOS(_ os: OperatingSystem, _ comment: Comment? = nil) -> Self {
+        disabled(comment ?? "This test cannot run on a \(os) host OS.") {
+            ProcessInfo.hostOperatingSystem == os
+        }
+    }
+
+    /// Skip test unconditionally
+    public static func skip(_ comment: Comment? = nil) -> Self {
+        disabled(comment ?? "Unconditional skip, a comment should be added for the reason") { true }
+    }
+
+    /// Skip test if the environment is self hosted.
+    public static func skipSwiftCISelfHosted(_ comment: Comment? = nil) -> Self {
+        disabled(comment ?? "SwiftCI is self hosted") {
+            ProcessInfo.processInfo.environment["SWIFTCI_IS_SELF_HOSTED"] != nil
+        }
+    }
+
+    /// Skip test if the test environment has a restricted network access, i.e. cannot get to internet.
+    public static func requireUnrestrictedNetworkAccess(_ comment: Comment? = nil) -> Self {
+        disabled(comment ?? "CI Environment has restricted network access") {
+            ProcessInfo.processInfo.environment["SWIFTCI_RESTRICTED_NETWORK_ACCESS"] != nil
+        }
+    }
+
+    /// Skip test if built by XCode.
+    public static func skipIfXcodeBuilt() -> Self {
+        disabled("Tests built by Xcode") {
+            #if Xcode
+            true
+            #else
+            false
+            #endif
+        }
+    }
+
+    /// Constructs a condition trait that causes a test to be disabled if the Foundation process spawning implementation
+    /// is not using `posix_spawn_file_actions_addchdir`.
+    public static var requireThreadSafeWorkingDirectory: Self {
+        disabled("Thread-safe process working directory support is unavailable.") {
+            // Amazon Linux 2 has glibc 2.26, and glibc 2.29 is needed for posix_spawn_file_actions_addchdir_np support
+            FileManager.default.contents(atPath: "/etc/system-release")
+                .map { String(decoding: $0, as: UTF8.self) == "Amazon Linux release 2 (Karoo)\n" } ?? false
+        }
+    }
+}