first commit

services/cart/routes_test.go

@@ -0,0 +1,214 @@
+package cart
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gorilla/mux"
+	"sismedika.com/sas/westone/types"
+)
+
+var mockProducts = []types.Product{
+	{ID: 1, Name: "product 1", Price: 10, Quantity: 100},
+	{ID: 2, Name: "product 2", Price: 20, Quantity: 200},
+	{ID: 3, Name: "product 3", Price: 30, Quantity: 300},
+	{ID: 4, Name: "empty stock", Price: 30, Quantity: 0},
+	{ID: 5, Name: "almost stock", Price: 30, Quantity: 1},
+}
+
+func TestCartServiceHandler(t *testing.T) {
+	productStore := &mockProductStore{}
+	orderStore := &mockOrderStore{}
+	handler := NewHandler(productStore, orderStore, nil)
+
+	t.Run("should fail to checkout if the cart items do not exist", func(t *testing.T) {
+		payload := types.CartCheckoutPayload{
+			Items: []types.CartCheckoutItem{
+				{ProductID: 99, Quantity: 100},
+			},
+		}
+
+		marshalled, err := json.Marshal(payload)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		req, err := http.NewRequest(http.MethodPost, "/cart/checkout", bytes.NewBuffer(marshalled))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		rr := httptest.NewRecorder()
+		router := mux.NewRouter()
+
+		router.HandleFunc("/cart/checkout", handler.handleCheckout).Methods(http.MethodPost)
+
+		router.ServeHTTP(rr, req)
+
+		if rr.Code != http.StatusBadRequest {
+			t.Errorf("expected status code %d, got %d", http.StatusBadRequest, rr.Code)
+		}
+	})
+
+	t.Run("should fail to checkout if the cart has negative quantities", func(t *testing.T) {
+		payload := types.CartCheckoutPayload{
+			Items: []types.CartCheckoutItem{
+				{ProductID: 1, Quantity: 0}, // invalid quantity
+			},
+		}
+
+		marshalled, err := json.Marshal(payload)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		req, err := http.NewRequest(http.MethodPost, "/cart/checkout", bytes.NewBuffer(marshalled))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		rr := httptest.NewRecorder()
+		router := mux.NewRouter()
+
+		router.HandleFunc("/cart/checkout", handler.handleCheckout).Methods(http.MethodPost)
+
+		router.ServeHTTP(rr, req)
+
+		if rr.Code != http.StatusBadRequest {
+			t.Errorf("expected status code %d, got %d", http.StatusBadRequest, rr.Code)
+		}
+	})
+
+	t.Run("should fail to checkout if there is no stock for an item", func(t *testing.T) {
+		payload := types.CartCheckoutPayload{
+			Items: []types.CartCheckoutItem{
+				{ProductID: 4, Quantity: 2},
+			},
+		}
+
+		marshalled, err := json.Marshal(payload)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		req, err := http.NewRequest(http.MethodPost, "/cart/checkout", bytes.NewBuffer(marshalled))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		rr := httptest.NewRecorder()
+		router := mux.NewRouter()
+
+		router.HandleFunc("/cart/checkout", handler.handleCheckout).Methods(http.MethodPost)
+
+		router.ServeHTTP(rr, req)
+
+		if rr.Code != http.StatusBadRequest {
+			t.Errorf("expected status code %d, got %d", http.StatusBadRequest, rr.Code)
+		}
+	})
+
+	t.Run("should fail to checkout if there is not enough stock", func(t *testing.T) {
+		payload := types.CartCheckoutPayload{
+			Items: []types.CartCheckoutItem{
+				{ProductID: 5, Quantity: 2},
+			},
+		}
+
+		marshalled, err := json.Marshal(payload)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		req, err := http.NewRequest(http.MethodPost, "/cart/checkout", bytes.NewBuffer(marshalled))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		rr := httptest.NewRecorder()
+		router := mux.NewRouter()
+
+		router.HandleFunc("/cart/checkout", handler.handleCheckout).Methods(http.MethodPost)
+
+		router.ServeHTTP(rr, req)
+
+		if rr.Code != http.StatusBadRequest {
+			t.Errorf("expected status code %d, got %d", http.StatusBadRequest, rr.Code)
+		}
+	})
+
+	t.Run("should checkout and calculate the price correctly", func(t *testing.T) {
+		payload := types.CartCheckoutPayload{
+			Items: []types.CartCheckoutItem{
+				{ProductID: 1, Quantity: 10},
+				{ProductID: 2, Quantity: 20},
+				{ProductID: 5, Quantity: 1},
+			},
+		}
+
+		marshalled, err := json.Marshal(payload)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		req, err := http.NewRequest(http.MethodPost, "/cart/checkout", bytes.NewBuffer(marshalled))
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		rr := httptest.NewRecorder()
+		router := mux.NewRouter()
+
+		router.HandleFunc("/cart/checkout", handler.handleCheckout).Methods(http.MethodPost)
+
+		router.ServeHTTP(rr, req)
+
+		if rr.Code != http.StatusOK {
+			t.Errorf("expected status code %d, got %d", http.StatusOK, rr.Code)
+		}
+
+		var response map[string]interface{}
+		if err := json.NewDecoder(rr.Body).Decode(&response); err != nil {
+			t.Fatal(err)
+		}
+
+		if response["total_price"] != 530.0 {
+			t.Errorf("expected total price to be 530, got %f", response["total_price"])
+		}
+	})
+}
+
+type mockProductStore struct{}
+
+func (m *mockProductStore) GetProductByID(productID int) (*types.Product, error) {
+	return &types.Product{}, nil
+}
+
+func (m *mockProductStore) GetProducts() ([]*types.Product, error) {
+	return []*types.Product{}, nil
+}
+
+func (m *mockProductStore) CreateProduct(product types.CreateProductPayload) error {
+	return nil
+}
+
+func (m *mockProductStore) GetProductsByID(ids []int) ([]types.Product, error) {
+	return mockProducts, nil
+}
+
+func (m *mockProductStore) UpdateProduct(product types.Product) error {
+	return nil
+}
+
+type mockOrderStore struct{}
+
+func (m *mockOrderStore) CreateOrder(order types.Order) (int, error) {
+	return 0, nil
+}
+
+func (m *mockOrderStore) CreateOrderItem(orderItem types.OrderItem) error {
+	return nil
+}