diff --git a/Tests/SilicaTests/Utilities/HTTP/HTTPClient.swift b/Tests/SilicaTests/Utilities/HTTP/HTTPClient.swift
index 67c3bf3..cf7c079 100644
--- a/Tests/SilicaTests/Utilities/HTTP/HTTPClient.swift
+++ b/Tests/SilicaTests/Utilities/HTTP/HTTPClient.swift
@@ -15,9 +15,20 @@ public extension HTTP {
     /// Loads HTTP requests
     public final class Client {
         
-        public init(session: URLSession = URLSession.shared) {
+        public init(session: URLSession? = nil) {
             
-            self.session = session
+            if let session = session {
+                
+                self.session = session
+                
+            } else {
+                
+                #if os(macOS)
+                    self.session = URLSession.shared
+                #else
+                    self.session = URLSession(configuration: URLSessionConfiguration())
+                #endif
+            }
         }
         
         /// The backing ```NSURLSession```.
diff --git a/Tests/SilicaTests/Utilities/TestAssets.swift b/Tests/SilicaTests/Utilities/TestAssets.swift
index 3958e25..05a2233 100644
--- a/Tests/SilicaTests/Utilities/TestAssets.swift
+++ b/Tests/SilicaTests/Utilities/TestAssets.swift
@@ -44,7 +44,7 @@ final class TestAssetManager {
     
     let cacheDirectory: URL
     
-    let httpClient = HTTP.Client(session: URLSession(configuration: URLSessionConfiguration()))
+    let httpClient = HTTP.Client()
     
     private(set) var downloadedAssets = [TestAsset]()