revises tests using AsyncTesting

Author: brennanMKE

Package.resolved

@@ -3,6 +3,13 @@
 
 import PackageDescription
 
+let swiftSettings: [SwiftSetting] = [
+    .unsafeFlags([
+        "-Xfrontend",
+        "-warn-concurrency",
+    ])
+]
+
 let package = Package(
     name: "AsyncChannelKit",
     platforms: [
@@ -16,13 +23,17 @@ let package = Package(
             name: "AsyncChannelKit",
             targets: ["AsyncChannelKit"]),
     ],
-    dependencies: [],
+    dependencies: [
+        .package(url: "https://github.com/brennanMKE/AsyncTesting.git", exact: "0.0.5")
+    ],
     targets: [
         .target(
             name: "AsyncChannelKit",
             dependencies: []),
         .testTarget(
             name: "AsyncChannelKitTests",
-            dependencies: ["AsyncChannelKit"]),
+            dependencies: ["AsyncChannelKit", "AsyncTesting"],
+            swiftSettings: swiftSettings
+        ),
     ]
 )