Explicitly added testing package

Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "b9c727a3413a2452777b7420295f2e19a96b3788e9724e5bcd783c619b3d3da6",
+  "originHash" : "d0639d77894dec0f8c9c248ccd806ac786a33d73b74f7fdce9ad802c50a95d5f",
   "pins" : [
     {
       "identity" : "rainbow",
@@ -9,6 +9,33 @@
         "revision" : "cdf146ae671b2624917648b61c908d1244b98ca1",
         "version" : "4.2.1"
       }
+    },
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser.git",
+      "state" : {
+        "revision" : "6a52f3251125d74daf04fcbd5e6f08a75d074382",
+        "version" : "1.8.2"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftlang/swift-syntax.git",
+      "state" : {
+        "revision" : "a8b1c535647243d603b6772e7e8306c993a0c188",
+        "version" : "605.0.0-prerelease-2026-06-26"
+      }
+    },
+    {
+      "identity" : "swift-testing",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftlang/swift-testing",
+      "state" : {
+        "branch" : "main",
+        "revision" : "a53b5cd4e7c5aad7814971f82a4e653908d041a8"
+      }
     }
   ],
   "version" : 3

Package.swift

@@ -9,6 +9,7 @@ let package = Package(
       .executable(name: "SwiftRunnerTesting", targets: ["SwiftRunnerTesting"]),
     ],
     dependencies: [
+      .package(url: "https://github.com/swiftlang/swift-testing", branch: "main"),
       .package(url: "https://github.com/onevcat/Rainbow", .upToNextMajor(from: "4.0.0"))
     ],
     targets: [
@@ -18,7 +19,10 @@ let package = Package(
       ),
       .testTarget(
           name: "SwiftRunnerTestingTests",
-          dependencies: ["SwiftRunnerTesting"]
+          dependencies: [
+            "swift-testing",
+            "SwiftRunnerTesting"
+          ]
       ),
     ],
     swiftLanguageModes: [.v6]