added api logic, vitest, minimal testing ui

api/tests/income.integration.test.ts

@@ -0,0 +1,71 @@
+import { beforeAll, afterAll, describe, it, expect } from "vitest";
+import request from "supertest";
+import { PrismaClient } from "@prisma/client";
+import type { FastifyInstance } from "fastify";
+import { resetUser } from "./helpers";
+
+// Ensure env BEFORE importing the server
+process.env.NODE_ENV = process.env.NODE_ENV || "test";
+process.env.PORT = process.env.PORT || "0";
+process.env.DATABASE_URL =
+  process.env.DATABASE_URL || "postgres://app:app@localhost:5432/skymoney";
+
+const prisma = new PrismaClient();
+let app: FastifyInstance;
+
+beforeAll(async () => {
+  // dynamic import AFTER env is set
+  const { default: srv } = await import("../src/server"); // <-- needs `export default app` in server.ts
+  app = srv;
+  await app.ready();
+
+  const U = "demo-user-1";
+  await resetUser(U);
+
+  await prisma.user.upsert({
+    where: { id: U },
+    update: {},
+    create: { id: U, email: `${U}@demo.local` },
+  });
+
+  await prisma.variableCategory.createMany({
+    data: [
+      { id: "c1", userId: U, name: "Groceries", percent: 60, priority: 1, isSavings: false, balanceCents: 0n },
+      { id: "c2", userId: U, name: "Saver",     percent: 40, priority: 2, isSavings: true,  balanceCents: 0n },
+    ],
+    skipDuplicates: true,
+  });
+
+  await prisma.fixedPlan.create({
+    data: {
+      id: "p1",
+      userId: U,
+      name: "Rent",
+      cycleStart: new Date().toISOString(),
+      dueOn: new Date(Date.now() + 7 * 864e5).toISOString(),
+      totalCents: 10000n,
+      fundedCents: 0n,
+      priority: 1,
+      fundingMode: "auto-on-deposit",
+    },
+  });
+});
+
+afterAll(async () => {
+  await app.close();
+  await prisma.$disconnect();
+});
+
+describe("POST /income integration", () => {
+  it("allocates funds and returns audit", async () => {
+    const res = await request(app.server)
+      .post("/income")
+      .set("x-user-id", "demo-user-1")
+      .send({ amountCents: 5000 });
+
+    expect(res.status).toBe(200);
+    expect(res.body).toHaveProperty("fixedAllocations");
+    expect(res.body).toHaveProperty("variableAllocations");
+    expect(typeof res.body.remainingUnallocatedCents).toBe("number");
+  });
+});