test(mvp1): expand domain schema and service unit coverage

packages/db/src/posts.test.ts

@@ -0,0 +1,75 @@
+import { beforeEach, describe, expect, it, vi } from "vitest"
+
+const { mockDb } = vi.hoisted(() => ({
+  mockDb: {
+    post: {
+      create: vi.fn(),
+      findMany: vi.fn(),
+      findUnique: vi.fn(),
+      update: vi.fn(),
+      delete: vi.fn(),
+    },
+  },
+}))
+
+vi.mock("./client", () => ({
+  db: mockDb,
+}))
+
+import { createPost, getPostBySlug, listPosts, updatePost } from "./posts"
+
+describe("posts service", () => {
+  beforeEach(() => {
+    for (const fn of Object.values(mockDb.post)) {
+      if (typeof fn === "function") {
+        fn.mockReset()
+      }
+    }
+  })
+
+  it("lists posts ordered by update date desc", async () => {
+    mockDb.post.findMany.mockResolvedValue([])
+
+    await listPosts()
+
+    expect(mockDb.post.findMany).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.findMany.mock.calls[0]?.[0]).toMatchObject({
+      orderBy: {
+        updatedAt: "desc",
+      },
+    })
+  })
+
+  it("parses create and update payloads through crud service", async () => {
+    mockDb.post.create.mockResolvedValue({ id: "post-1" })
+    mockDb.post.findUnique.mockResolvedValue({ id: "550e8400-e29b-41d4-a716-446655440000" })
+    mockDb.post.update.mockResolvedValue({ id: "post-1" })
+
+    await createPost({
+      title: "A title",
+      slug: "a-title",
+      body: "Body",
+      status: "draft",
+    })
+
+    await updatePost("550e8400-e29b-41d4-a716-446655440000", {
+      title: "Updated",
+    })
+
+    expect(mockDb.post.create).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.update).toHaveBeenCalledTimes(1)
+  })
+
+  it("finds posts by slug", async () => {
+    mockDb.post.findUnique.mockResolvedValue({ id: "post-1", slug: "hello" })
+
+    await getPostBySlug("hello")
+
+    expect(mockDb.post.findUnique).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.findUnique).toHaveBeenCalledWith({
+      where: {
+        slug: "hello",
+      },
+    })
+  })
+})