Test expense creation end-to-end

This change adds an end-to-end test for expense creation. It validates
that the expense was created properly and the returned data is correct.
It should be used as a model to guide further tests layout.

e2e/expenses_test.go

@@ -0,0 +1,75 @@
+package e2e
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"testing"
+
+	"github.com/Ozoniuss/casheer/currency"
+	"github.com/Ozoniuss/casheer/internal/store"
+	"github.com/Ozoniuss/casheer/pkg/casheerapi"
+)
+
+func setupEntry(t *testing.T) int {
+	id, err := store.CreateDummyEntry(conn)
+	if err != nil {
+		t.Fatalf("failed creating dummy entry: %s", err.Error())
+	}
+	t.Logf("created dummy entry with id %d", id)
+	return id
+}
+
+func Test_CreateBasicExpense_ExpenseIsCreated_and_ReturnedValuesAreCorrect(t *testing.T) {
+
+	t.Cleanup(func() {
+		store.DeleteAllData(conn)
+	})
+	entid := setupEntry(t)
+
+	var name = "expense 1"
+	var description = "description"
+	var paymentMethod = "card"
+	var amount = 1500
+	var ccurrency = "RON"
+	expenseResponse, err := casheerClient.CreateBasicExpense(entid, name, description, paymentMethod, amount, ccurrency)
+	if err != nil {
+		t.Fatalf("Did not expect error when creating expense, but got error: %s\n", err.Error())
+	}
+
+	if expenseResponse.Data.Type != "expense" {
+		t.Errorf("Invalid return type, expected \"expense\" but got \"%s\"\n", expenseResponse.Data.Type)
+	}
+
+	// Check attributes
+	if expenseResponse.Data.Attributes.Name != name {
+		t.Errorf("Expense name doesn't match; expected %s but got %s\n", name, expenseResponse.Data.Attributes.Name)
+	}
+	if expenseResponse.Data.Attributes.Description != description {
+		t.Errorf("Expense description doesn't match; expected %s but got %s\n", description, expenseResponse.Data.Attributes.Description)
+	}
+	if expenseResponse.Data.Attributes.PaymentMethod != paymentMethod {
+		t.Errorf("Expense payment method doesn't match; expected %s but got %s\n", paymentMethod, expenseResponse.Data.Attributes.PaymentMethod)
+	}
+	val := currency.NewRONValue(1500)
+	if expenseResponse.Data.Attributes.Value != (casheerapi.MonetaryValueAttributes{
+		Amount:   val.Amount,
+		Exponent: val.Exponent,
+		Currency: val.Currency,
+	}) {
+		t.Errorf("Expense value doesn't match; expected %v but got %v\n", expenseResponse.Data.Attributes.Value, casheerapi.MonetaryValueAttributes{
+			Amount:   val.Amount,
+			Exponent: val.Exponent,
+			Currency: val.Currency,
+		})
+	}
+
+	if !strings.Contains(expenseResponse.Data.Links.Self, fmt.Sprintf("%d/expenses/%s", entid, expenseResponse.Data.Id)) {
+		t.Errorf("Invalid related link format; got %s\n", expenseResponse.Data.Links.Self)
+	}
+
+	// Check related resources
+	if !strings.Contains(expenseResponse.Data.Relationships.Entries.Links.Related, strconv.Itoa(entid)) {
+		t.Errorf("Expected related link (%s) to include expense id (%d)\n", expenseResponse.Data.Relationships.Entries.Links.Related, entid)
+	}
+}