prvi kod za live uporabu

backend/modules/invoicing/tests/test_models.py

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+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)