Implement expense tracking foundation for v1

src/lib/validation.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+
+import { expenseInputSchema } from "@/lib/validation";
+
+describe("expenseInputSchema", () => {
+  it("accepts valid expense payloads", () => {
+    const parsed = expenseInputSchema.parse({
+      title: "Groceries",
+      amount: "64.32",
+      date: "2026-03-23",
+      category: "FOOD",
+    });
+
+    expect(parsed.amount).toBe(6432);
+  });
+
+  it("rejects invalid categories", () => {
+    const parsed = expenseInputSchema.safeParse({
+      title: "Groceries",
+      amount: "64.32",
+      date: "2026-03-23",
+      category: "OTHER",
+    });
+
+    expect(parsed.success).toBe(false);
+  });
+});