Packages/Infrastructure/Sources/Public/Enumerations/AssetExtension.swift

@@ -1,21 +1,25 @@
 /// A file extension used by an ``Asset``.
 ///
 /// Each case's raw value is the extension itself (e.g. `"css"`), which an asset appends to its file name when resolving paths.
-public enum AssetExtension: String, Sendable {
+public enum AssetExtension: String, CaseIterable, Sendable {
     /// A Cascading Style Sheets file.
     case css
+    /// A Windows icon image.
+    case ico
+    /// A JPEG image.
+    case jpg
     /// A JavaScript file.
     case js
     /// A Portable Network Graphics image.
     case png
-    /// A Windows icon image.
-    case ico
     /// A Scalable Vector Graphics image.
     case svg
     /// A plain text file.
     case txt
     /// A web application manifest file.
     case webmanifest
+    /// A WebP image.
+    case webp
     /// An Extensible Markup Language file.
     case xml
 }
@@ -30,12 +34,14 @@ public extension AssetExtension {
     var contentType: String {
         switch self {
         case .css: "text/css"
+        case .ico: "image/vnd.microsoft.icon"
+        case .jpg: "image/jpeg"
         case .js: "text/javascript"
         case .png: "image/png"
-        case .ico: "image/vnd.microsoft.icon"
         case .svg: "image/svg+xml"
         case .txt: "text/plain"
         case .webmanifest: "application/manifest+json"
+        case .webp: "image/webp"
         case .xml: "application/xml"
         }
     }
@@ -45,6 +51,9 @@ public extension AssetExtension {
         switch self {
         case .css: "css"
         case .js: "js"
+        case .jpg,
+             .mp4,
+             .webp: "media"
         default: nil
         }
     }

Packages/Infrastructure/Tests/Cases/Public/Enumerations/AssetExtensionTests.swift

@@ -32,6 +32,17 @@ struct AssetExtensionTests {
         #expect(fileExtension.folder == folder)
     }
 
+    // MARK: CaseIterable tests
+
+    @Test
+    func `covers every case in the parameterised tests`() {
+        // `zip` stops at the shorter sequence, so a case missing from the arrays below is silently untested rather
+        // than failing — this is what catches that.
+        #expect(Self.extensions == AssetExtension.allCases)
+        #expect(Self.contentTypes.count == AssetExtension.allCases.count)
+        #expect(Self.folders.count == AssetExtension.allCases.count)
+    }
+
 }
 
 // MARK: - Helpers
@@ -44,6 +55,8 @@ private extension AssetExtensionTests {
         .css,
         .js,
         .png,
+        .jpg,
+        .webp,
         .ico,
         .svg,
         .txt,
@@ -54,6 +67,8 @@ private extension AssetExtensionTests {
         "text/css",
         "text/javascript",
         "image/png",
+        "image/jpeg",
+        "image/webp",
         "image/vnd.microsoft.icon",
         "image/svg+xml",
         "text/plain",
@@ -64,6 +79,8 @@ private extension AssetExtensionTests {
         "css",
         "js",
         nil,
+        "media",
+        "media",
         nil,
         nil,
         nil,