Model Test Example

# models.py

from django.db import models

class Product(models.Model):
    name = models.CharField(max_length=100)
    price = models.DecimalField(max_digits=8, decimal_places=2, default=0)

    def discount(self, pct):
        return self.price * (1 - pct)
      

# admin.py

from django.contrib import admin
from .models import Product

@admin.register(Product)
class ProductAdmin(admin.ModelAdmin):
    list_display = ("name", "price")
      

# Result (tests/test_models.py)
from django.test import TestCase
from decimal import Decimal
from .models import Product

class ProductModelTest(TestCase):
    def test_discount(self):
        p = Product.objects.create(name="P", price=Decimal("100.00"))
        self.assertEqual(p.discount(Decimal("0.10")), Decimal("90.00"))