Restructured the folder structure of the test target.

Package.swift

@@ -45,8 +45,10 @@ let package = Package(
         ),
         .testTarget(
             name: "ColibriTests",
-            dependencies: ["ColibriLibrary"],
-            path: "Tests/Library"
+            dependencies: [
+                .target(name: "ColibriLibrary")
+            ],
+            path: "Test"
         )
     ]
 )