Implemented phase 3 for the POC prototype in the Website service.

Services/Website/Tests/Library/Utils/Stubs/Listing+Stub.swift

@@ -13,7 +13,8 @@ extension Listing {
         condition: String = "NM/M",
         keyNotes: String? = nil,
         priceCents: Int = 24_000,
-        acceptsOffers: Bool = true
+        acceptsOffers: Bool = true,
+        soldAt: Date? = nil
     ) -> Self {
         .init(
             slug: slug, shop: shop, title: title, seriesTitle: "Nightward (2019 series)", issueLabel: "#1",
@@ -23,7 +24,8 @@ extension Listing {
             keyNotes: keyNotes, sellerNotes: "Clean case.", priceCents: priceCents, shippingCents: 600,
             acceptsOffers: acceptsOffers,
             cover: .init(tone: "navy", title: "NIGHT\nWARD", imprint: "MERIDIAN", number: "1"),
-            listedAt: .init(timeIntervalSince1970: 0)
+            listedAt: .init(timeIntervalSince1970: 0),
+            soldAt: soldAt
         )
     }
 }

Services/Website/Tests/Library/Utils/Stubs/Trade+Stub.swift

@@ -0,0 +1,98 @@
+import Foundation
+import Persistence
+
+extension Date {
+    /// The moment the trade stubs are stamped at: 23 September 2026, 09:14 in Amsterdam.
+    static let stub = Date(timeIntervalSince1970: 1_790_147_640)
+}
+
+extension User {
+    /// The demo buyer.
+    static let mara = User(id: .init(), email: "mara.v@example.com", displayName: "Mara Visser")
+    /// The demo seller, owner of the stub shop.
+    static let joost = User(id: .init(), email: "joost@kestrelrow.example", displayName: "Joost de Wit")
+}
+
+extension Offer {
+    /// An offer of €215 by the demo buyer on the stub listing, open for another 47 hours unless told otherwise.
+    static func stub(
+        listing: Listing = .stub(),
+        amountCents: Int = 21_500,
+        status: Status = .open
+    ) -> Self {
+        .init(
+            id: .init(uuidString: "00000000-0000-0000-0000-0000000000AA") ?? .init(),
+            conversationID: .init(uuidString: "00000000-0000-0000-0000-0000000000CC") ?? .init(),
+            listing: listing,
+            buyer: .mara,
+            amountCents: amountCents,
+            status: status,
+            createdAt: .stub.addingTimeInterval(-3_600),
+            expiresAt: .stub.addingTimeInterval(47 * 3_600 + 60)
+        )
+    }
+}
+
+extension Sale {
+    /// A sale of the stub listing at €215 + €6, agreed at the stub moment, as far along as told.
+    static func stub(
+        priceCents: Int = 21_500,
+        paid: Bool = false,
+        sent: Bool = false,
+        received: Bool = false,
+        buyerRating: Int? = nil,
+        sellerRating: Int? = nil
+    ) -> Self {
+        .init(
+            number: 48_213,
+            conversationID: .init(uuidString: "00000000-0000-0000-0000-0000000000CC") ?? .init(),
+            listing: .stub(soldAt: .stub),
+            buyer: .mara,
+            seller: .joost,
+            priceCents: priceCents,
+            askedCents: 24_000,
+            shippingCents: 600,
+            declared: .init(grade: "CGC 9.8 · cert 4312087-002", pageQuality: "White", printing: "First printing", notes: "Clean case."),
+            agreedAt: .stub,
+            paidAt: paid ? .stub.addingTimeInterval(360) : nil,
+            paymentNote: paid ? "iDEAL" : nil,
+            sentAt: sent ? .stub.addingTimeInterval(720) : nil,
+            shippingNote: sent ? "DHL 3S123" : nil,
+            receivedAt: received ? .stub.addingTimeInterval(1_080) : nil,
+            buyerRating: buyerRating,
+            sellerRating: sellerRating
+        )
+    }
+}
+
+extension Conversation {
+    /// A conversation about the stub listing, seen from the given side, holding the given entries.
+    static func stub(
+        side: Side = .buying,
+        listing: Listing? = .stub(),
+        entries: [Entry] = [],
+        unreadCount: Int = 0,
+        saleNumber: Int? = nil
+    ) -> Self {
+        .init(
+            id: .init(uuidString: "00000000-0000-0000-0000-0000000000CC") ?? .init(),
+            buyer: .mara,
+            shop: .stub(),
+            listing: listing,
+            side: side,
+            entries: entries,
+            unreadCount: unreadCount,
+            saleNumber: saleNumber
+        )
+    }
+}
+
+extension Conversation.Entry {
+    /// Something a party wrote at the stub moment.
+    static func text(
+        _ body: String,
+        from sender: User
+    ) -> Self {
+        .init(kind: .text, sender: sender, body: body, createdAt: .stub)
+    }
+}