LessonRepositoryTests.swift

import Foundation
import Testing

@testable import SwiftAtlas

struct LessonRepositoryTests {
  @Test
  func mapsRemotePayloadsIntoLessonGroups() async throws {
    let encoder = JSONEncoder()
    let payloads: [String: Data] = [
      "/posts": try encoder.encode([
        PostDTO(
          userId: 1, id: 1, title: "mvvm foundations",
          body: "Map transport models into domain language."),
        PostDTO(
          userId: 1, id: 2, title: "cache policies", body: "Cache first keeps first render fast."),
      ]),
      "/users": try encoder.encode([
        UserDTO(
          id: 1, name: "Ava Metrics", username: "Ava", email: "ava@example.com",
          company: .init(
            name: "Architecture", catchPhrase: "Design stable boundaries", bs: "teaching mentor"))
      ]),
    ]
    let repository = DefaultLessonRepository(
      httpClient: FakeHTTPClient(payloads: payloads), cacheStore: InMemoryCacheStore())

    let groups = try await repository.fetchLessonGroups(policy: .remoteOnly)

    #expect(groups.count == 1)
    #expect(groups.first?.title == "Architecture")
    #expect(groups.first?.lessons.count == 2)
  }
}