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254
test/unit/checkout_test.dart
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254
test/unit/checkout_test.dart
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import 'package:flutter_test/flutter_test.dart';
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import 'package:nearle_pos/data/datasources/local_store.dart';
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import 'package:nearle_pos/data/repositories/customer_repository_impl.dart';
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import 'package:nearle_pos/data/repositories/product_repository_impl.dart';
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import 'package:nearle_pos/data/repositories/transaction_repository_impl.dart';
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import 'package:nearle_pos/domain/entities/cart.dart';
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import 'package:nearle_pos/domain/entities/customer.dart';
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import 'package:nearle_pos/domain/entities/transaction.dart';
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import 'package:nearle_pos/domain/usecases/checkout_sale.dart';
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void main() {
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late LocalStore store;
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late ProductRepositoryImpl products;
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late CustomerRepositoryImpl customers;
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late TransactionRepositoryImpl transactions;
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late CheckoutSale checkout;
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setUp(() async {
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store = LocalStore.instance;
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// Fresh seed for every test so stock and invoice sequence never leak.
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await store.reset();
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products = ProductRepositoryImpl(store);
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customers = CustomerRepositoryImpl(store);
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transactions = TransactionRepositoryImpl(store);
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checkout = CheckoutSale(
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productRepository: products,
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customerRepository: customers,
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transactionRepository: transactions,
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);
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});
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/// Amul Milk 1L: 62.00, 5% GST, 50 in stock.
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Future<Cart> milkCart({int qty = 2, String? customerId}) async {
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final milk = (await products.findByBarcode('8901234500011'))!;
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final customer =
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customerId == null ? null : await customers.findById(customerId);
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return Cart(
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lines: [CartLine(product: milk, quantity: qty.toDouble())],
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customer: customer,
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);
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}
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group('successful checkout', () {
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test('records the sale and returns an invoice', () async {
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final cart = await milkCart();
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expect(cart.grandTotal, 124);
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final result = await checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 124, tendered: 200),
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],
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cashierName: 'Suriya',
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);
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final txn = result.transaction;
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expect(txn.total, 124);
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expect(txn.amountPaid, 124);
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expect(txn.changeDue, 76);
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expect(txn.isFullySettled, isTrue);
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expect(txn.isSplit, isFalse);
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expect(txn.invoiceNumber, contains('00001'));
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expect(txn.status, TransactionStatus.completed);
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});
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test('decrements stock by the quantity sold', () async {
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final cart = await milkCart();
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await checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 124, tendered: 124),
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],
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cashierName: 'Suriya',
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);
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final milk = await products.findByBarcode('8901234500011');
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expect(milk!.stock, 48);
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});
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test('persists the transaction to history', () async {
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final cart = await milkCart();
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await checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 124, tendered: 124),
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],
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cashierName: 'Suriya',
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);
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final history = await transactions.history();
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expect(history, hasLength(1));
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expect(await transactions.salesTotalForDay(DateTime.now()), 124);
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});
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test('accepts a split across two tenders', () async {
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final cart = await milkCart();
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final result = await checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 100, tendered: 100),
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PaymentSplit(
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method: PaymentMethod.upi,
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amount: 24,
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reference: 'UPI-991',
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),
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],
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cashierName: 'Suriya',
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);
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expect(result.transaction.isSplit, isTrue);
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expect(result.transaction.amountPaid, 124);
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expect(result.transaction.paymentSummary, 'Cash + UPI');
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});
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test('moves loyalty points and lifetime spend for a member', () async {
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final cart = await milkCart(customerId: 'c001');
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// 124 less the 2% silver discount, rounded.
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expect(cart.membershipDiscountAmount, 2.48);
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expect(cart.grandTotal, 122);
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expect(cart.pointsEarned, 12);
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final result = await checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 122, tendered: 200),
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],
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cashierName: 'Suriya',
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);
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final updated = result.updatedCustomer!;
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expect(updated.loyaltyPoints, 332); // 320 + 12
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expect(updated.lifetimeSpend, 24622); // 24500 + 122
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expect(updated.visitCount, 42);
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});
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});
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group('rejected checkout', () {
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test('refuses an empty cart', () async {
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expect(
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() => checkout(
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cart: Cart.empty,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 0),
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],
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cashierName: 'Suriya',
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),
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throwsA(isA<CheckoutFailure>()),
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);
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});
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test('refuses a bill with no tender', () async {
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final cart = await milkCart();
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expect(
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() => checkout(cart: cart, payments: const [], cashierName: 'Suriya'),
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throwsA(isA<CheckoutFailure>()),
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);
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});
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test('refuses an underpayment', () async {
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final cart = await milkCart();
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expect(
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() => checkout(
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cart: cart,
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payments: const [
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PaymentSplit(method: PaymentMethod.cash, amount: 100, tendered: 100),
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],
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cashierName: 'Suriya',
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),
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throwsA(isA<CheckoutFailure>()),
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);
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});
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test('refuses to sell more than is in stock', () async {
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final cart = await milkCart(qty: 999);
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expect(
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() => checkout(
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cart: cart,
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payments: [
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PaymentSplit(
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method: PaymentMethod.cash,
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amount: cart.grandTotal,
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tendered: cart.grandTotal,
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),
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],
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cashierName: 'Suriya',
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),
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throwsA(isA<CheckoutFailure>()),
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);
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});
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test('leaves stock untouched when validation fails', () async {
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final cart = await milkCart();
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try {
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await checkout(cart: cart, payments: const [], cashierName: 'Suriya');
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} on CheckoutFailure {
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// expected
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}
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final milk = await products.findByBarcode('8901234500011');
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expect(milk!.stock, 50);
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});
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});
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group('repositories', () {
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test('finds a customer by mobile number', () async {
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final found = await customers.findByMobile('9876543210');
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expect(found?.name, 'Abhishek');
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expect(await customers.findByMobile('0000000000'), isNull);
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});
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test('rejects a duplicate mobile number on create', () async {
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// 9876543210 already belongs to the seeded customer c001.
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expect(
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() => customers.create(
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const Customer(id: '', name: 'Impostor', mobile: '9876543210'),
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),
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throwsA(isA<StateError>()),
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);
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});
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test('creates a customer with a generated id and zeroed loyalty', () async {
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final created = await customers.create(
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const Customer(id: '', name: 'New Shopper', mobile: '9000011111'),
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);
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expect(created.id, isNotEmpty);
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expect(created.loyaltyPoints, 0);
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expect(created.lifetimeSpend, 0);
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expect(created.tier, MembershipTier.bronze);
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expect(await customers.findByMobile('9000011111'), isNotNull);
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});
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test('ranks an exact barcode above a fuzzy name match', () async {
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final results = await products.search('8901234500011');
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expect(results.first.name, 'Amul Milk 1L');
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});
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test('parks and resumes a bill', () async {
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final cart = await milkCart();
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await transactions.park(
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ParkedBill(id: 'park-1', cart: cart, parkedAt: DateTime.now()),
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);
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expect(await transactions.parkedBills(), hasLength(1));
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await transactions.removeParked('park-1');
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expect(await transactions.parkedBills(), isEmpty);
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});
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});
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}
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