import pytest
from modules.invoicing.models import Invoice, InvoiceItem

@pytest.mark.django_db
def test_invoice_str_representation(invoice_a):
    assert str(invoice_a) == f"{invoice_a.invoice_number} - {invoice_a.client}"

@pytest.mark.django_db
def test_invoice_total_calculation(invoice_a):
    InvoiceItem.objects.create(invoice=invoice_a, description="Test", quantity=2, unit_price=50.00)
    InvoiceItem.objects.create(invoice=invoice_a, description="Test2", quantity=1, unit_price=25.00)
    assert invoice_a.get_total_amount() == 125.00

@pytest.mark.django_db
def test_invoice_number_autogenerate():
    # Testiramo da li se automatski generira ako nije zadan
    from modules.invoicing.models import Invoice
    # (Za ovo ti treba 'creator' i 'client' fixture-i)