Added an optional per-asset folder to the Asset protocol and the AssetExtension extension in the Infrastructure package.

Packages/Infrastructure/Tests/Cases/Public/Protocols/AssetTests.swift

@@ -14,6 +14,11 @@ struct AssetTests {
         fileExtensions: [.png],
         fileName: "icon"
     )
+    private let portrait = StubAsset(
+        folder: "img/organizer",
+        fileExtensions: [.jpg],
+        fileName: "portrait"
+    )
     private let shared = StubAsset(
         fileExtensions: [.css, .js],
         fileName: "shared"
@@ -22,13 +27,18 @@ struct AssetTests {
     // MARK: Method tests
 
     @Test
-    func `relative path nests the file inside its extension's sub-directory`() {
+    func `relative path nests the file inside its extension's folder`() {
         #expect(shared.relativePath(for: .css) == "css/shared.css")
         #expect(shared.relativePath(for: .js) == "js/shared.js")
     }
 
     @Test
-    func `relative path keeps the file at the root without a sub-directory`() {
+    func `relative path prefers the asset's own folder over the extension's`() {
+        #expect(portrait.relativePath(for: .jpg) == "img/organizer/portrait.jpg")
+    }
+
+    @Test
+    func `relative path keeps the file at the root without a folder`() {
         #expect(image.relativePath(for: .png) == "icon.png")
     }