added api logic, vitest, minimal testing ui

api/tests/transactions.test.ts

@@ -0,0 +1,66 @@
+import request from "supertest";
+import { describe, it, expect, beforeAll, beforeEach, afterAll } from "vitest";
+import appFactory from "./appFactory";
+import { prisma, resetUser, ensureUser, U, cid, closePrisma } from "./helpers";
+import type { FastifyInstance } from "fastify";
+
+let app: FastifyInstance;
+
+beforeAll(async () => {
+  app = await appFactory();
+});
+
+afterAll(async () => {
+  await app.close();
+  await closePrisma();
+});
+
+describe("GET /transactions", () => {
+  beforeEach(async () => {
+    await resetUser(U);
+    await ensureUser(U);
+
+    const c = cid("c");
+    await prisma.variableCategory.create({
+      data: { id: c, userId: U, name: "Groceries", percent: 100, priority: 1, isSavings: false, balanceCents: 5000n },
+    });
+
+    // seed some transactions of different kinds/dates
+    await prisma.transaction.createMany({
+      data: [
+        {
+          id: `t_${Date.now()}_1`,
+          userId: U,
+          occurredAt: new Date("2025-01-03T12:00:00.000Z"),
+          kind: "variable_spend",
+          categoryId: c,
+          amountCents: 1000n,
+        },
+        {
+          id: `t_${Date.now()}_2`,
+          userId: U,
+          occurredAt: new Date("2025-01-10T12:00:00.000Z"),
+          kind: "fixed_payment",
+          planId: null,
+          amountCents: 2000n,
+        },
+      ],
+    });
+  });
+
+  afterAll(async () => {
+    await closePrisma();
+  });
+
+  it("paginates + filters by kind/date", async () => {
+    const res = await request(app.server)
+      .get("/transactions?from=2025-01-02&to=2025-01-06&kind=variable_spend&page=1&limit=10")
+      .set("x-user-id", U);
+
+    expect(res.statusCode).toBe(200);
+    const body = res.body;
+    expect(Array.isArray(body.items)).toBe(true);
+    expect(body.items.length).toBe(1);
+    expect(body.items[0].kind).toBe("variable_spend");
+  });
+});