diff --git a/package.json b/package.json
index b4dd035..5b8ccd8 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "db:studio": "drizzle-kit studio",
     "dev": "bunx --bun vite dev",
     "fix": "biome check --write",
+    "test": "bun test",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
diff --git a/src/server/api/contracts/todo.contract.test.ts b/src/server/api/contracts/todo.contract.test.ts
new file mode 100644
index 0000000..23a3f78
--- /dev/null
+++ b/src/server/api/contracts/todo.contract.test.ts
@@ -0,0 +1,20 @@
+import { describe, expect, test } from 'bun:test'
+import { createInsertSchema } from 'drizzle-zod'
+import { generatedFieldKeys } from '@/server/db/fields'
+import { todoTable } from '@/server/db/schema'
+
+describe('todo insert schema', () => {
+  const insertSchema = createInsertSchema(todoTable).omit(generatedFieldKeys)
+
+  test('accepts a minimal valid input', () => {
+    expect(insertSchema.safeParse({ title: 'buy milk' }).success).toBe(true)
+  })
+
+  test('rejects missing title', () => {
+    expect(insertSchema.safeParse({}).success).toBe(false)
+  })
+
+  test('rejects non-string title', () => {
+    expect(insertSchema.safeParse({ title: 42 }).success).toBe(false)
+  })
+})