Added the catalogue models and seed to support phase 3 of the POC prototype in the Persistence package.

Packages/Persistence/Tests/Cases/Public/Models/SaleTests.swift

@@ -0,0 +1,118 @@
+import Foundation
+import Testing
+
+@testable import Persistence
+
+@Suite(
+    "Sale model",
+    .tags(.model)
+)
+struct SaleTests {
+
+    // MARK: Computed tests
+
+    @Test
+    func `walks the handshake one step at a time`() {
+        #expect(sale().completed == .agreed)
+        #expect(sale().next == .paid)
+        #expect(sale(paid: true).completed == .paid)
+        #expect(sale(paid: true, sent: true).completed == .sent)
+        #expect(sale(paid: true, sent: true, received: true).completed == .received)
+        #expect(sale(paid: true, sent: true, received: true, buyerRating: 5).completed == .received)
+        #expect(sale(paid: true, sent: true, received: true, buyerRating: 5, sellerRating: 4).completed == .rated)
+        #expect(sale(paid: true, sent: true, received: true, buyerRating: 5, sellerRating: 4).next == nil)
+    }
+
+    @Test
+    func `adds the shipping to the price`() {
+        #expect(sale().totalCents == 22_100)
+    }
+
+    // MARK: Methods tests
+
+    @Test
+    func `gives each step to its party, once, in order`() {
+        #expect(sale().allows(.markPaid(note: ""), by: .buyer))
+        #expect(!sale().allows(.markPaid(note: ""), by: .seller))
+        #expect(!sale(paid: true).allows(.markPaid(note: ""), by: .buyer))
+
+        #expect(!sale().allows(.markSent(note: ""), by: .seller))
+        #expect(sale(paid: true).allows(.markSent(note: ""), by: .seller))
+        #expect(!sale(paid: true).allows(.markSent(note: ""), by: .buyer))
+
+        #expect(!sale(paid: true).allows(.markReceived, by: .buyer))
+        #expect(sale(paid: true, sent: true).allows(.markReceived, by: .buyer))
+        #expect(!sale(paid: true, sent: true).allows(.markReceived, by: .seller))
+    }
+
+    @Test
+    func `unlocks ratings only once the copy is received, one per party, out of five`() {
+        let received = sale(paid: true, sent: true, received: true)
+
+        #expect(!sale(paid: true, sent: true).allows(.rate(stars: 5), by: .buyer))
+        #expect(received.allows(.rate(stars: 5), by: .buyer))
+        #expect(received.allows(.rate(stars: 1), by: .seller))
+        #expect(!received.allows(.rate(stars: 0), by: .buyer))
+        #expect(!received.allows(.rate(stars: 6), by: .buyer))
+        #expect(!sale(paid: true, sent: true, received: true, buyerRating: 5).allows(.rate(stars: 4), by: .buyer))
+        #expect(sale(paid: true, sent: true, received: true, buyerRating: 5).allows(.rate(stars: 4), by: .seller))
+    }
+
+    @Test
+    func `knows its parties`() {
+        let sale = sale()
+
+        #expect(sale.role(of: sale.buyer.id) == .buyer)
+        #expect(sale.role(of: sale.seller.id) == .seller)
+        #expect(sale.role(of: .init()) == nil)
+    }
+
+    // MARK: Offer tests
+
+    @Test(arguments: zip(
+        [24_000, 1_400, 4_500, 100],
+        [19_200, 1_200, 3_600, 100]
+    ))
+    func `floors offers at four fifths of the asking price, in whole euros`(
+        asking: Int,
+        expects floor: Int
+    ) {
+        #expect(Offer.floor(forAsking: asking) == floor)
+    }
+
+}
+
+// MARK: - Helpers
+
+private extension SaleTests {
+
+    /// A sale of the first demo listing at €215 + €6, as far along as told.
+    func sale(
+        paid: Bool = false,
+        sent: Bool = false,
+        received: Bool = false,
+        buyerRating: Int? = nil,
+        sellerRating: Int? = nil
+    ) -> Sale {
+        let stamp = Date(timeIntervalSince1970: 0)
+
+        return .init(
+            number: 48_213,
+            conversationID: .init(),
+            listing: Seed.listings[0],
+            buyer: .init(id: .init(), email: "mara.v@example.com", displayName: "Mara Visser"),
+            seller: .init(id: .init(), email: "joost@kestrelrow.example", displayName: "Joost de Wit"),
+            priceCents: 21_500,
+            askedCents: 24_000,
+            shippingCents: 600,
+            declared: .init(grade: "CGC 9.8", pageQuality: "White", printing: "First printing", notes: ""),
+            agreedAt: stamp,
+            paidAt: paid ? stamp : nil,
+            sentAt: sent ? stamp : nil,
+            receivedAt: received ? stamp : nil,
+            buyerRating: buyerRating,
+            sellerRating: sellerRating
+        )
+    }
+
+}