Kept the prototype out of search engines in the Website service.

Services/Website/Tests/Library/Cases/Public/Middlewares/NoIndexMiddlewareTests.swift

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+import Hummingbird
+import HummingbirdTesting
+import Infrastructure
+import Testing
+
+@testable import WebsiteLibrary
+
+@Suite(
+    "NoIndexMiddleware middleware",
+    .tags(.type)
+)
+struct NoIndexMiddlewareTests {
+
+    // MARK: Functional tests
+
+    @Test
+    func `marks what is served, what redirects, and what fails`() async throws {
+        let router = Router(context: WebsiteRequestContext.self)
+
+        router.add(middleware: NoIndexMiddleware())
+        router.get("/page") { _, _ in "A page" }
+        router.get("/moved") { _, _ in Response.redirect(to: "/page") }
+        router.get("/forbidden") { _, _ -> String in throw HTTPError(.forbidden) }
+        router.get("/marked") { _, _ in
+            Response(status: .ok, headers: [.robotsTag: "noindex"])
+        }
+
+        try await Application(router: router).test(.router) { client in
+            for (uri, status) in [("/page", HTTPResponse.Status.ok), ("/moved", .seeOther), ("/forbidden", .forbidden), ("/missing", .notFound)] {
+                try await client.execute(uri: uri, method: .get) { response in
+                    #expect(response.status == status)
+                    #expect(response.headers[.robotsTag] == "noindex, nofollow")
+                }
+            }
+
+            // One mark, not two: a response that came marked is marked over.
+            try await client.execute(uri: "/marked", method: .get) { response in
+                #expect(response.headers[values: .robotsTag] == ["noindex, nofollow"])
+            }
+        }
+    }
+
+}