Testing models in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this Django model test?

Consider this Django model test code. What will be the output when running this test?

Django

from django.test import TestCase
from myapp.models import Product

class ProductTest(TestCase):
    def test_str_method(self):
        product = Product(name='Book', price=10)
        self.assertEqual(str(product), 'Book')

A Test passes successfully

B Test fails with AssertionError

C Raises AttributeError because price is missing

D Raises TypeError due to wrong argument

💡 Hint

Check what the __str__ method of the Product model returns.

The test creates a Product instance with name 'Book' and price 10. The test checks if str(product) returns 'Book'. If the Product model's __str__ method returns the name, the test passes.

❓ state_output

intermediate

What is the value of product_count after test?

Given this Django test case, what is the value of product_count after running test_product_creation?

Django

from django.test import TestCase
from myapp.models import Product

class ProductTest(TestCase):
    def test_product_creation(self):
        Product.objects.create(name='Pen', price=5)
        Product.objects.create(name='Pencil', price=3)
        product_count = Product.objects.count()

A 2

B 0

C 1

D Raises DatabaseError

💡 Hint

Count how many Product objects are created in the test.

Two Product objects are created in the test, so the count is 2.

🔧 Debug

advanced

What error does this Django model test raise?

This test tries to create a Product without a required field. What error will it raise?

Django

from django.test import TestCase
from myapp.models import Product

class ProductTest(TestCase):
    def test_missing_name(self):
        Product.objects.create(price=10)

A No error, object created

B ValueError

C TypeError

D django.db.utils.IntegrityError

💡 Hint

Check if the name field is required and what happens if it is missing.

If the name field is required (not nullable), the database will raise IntegrityError when trying to insert a null value.

📝 Syntax

advanced

Which option fixes the syntax error in this Django test?

Identify the correct syntax to define a Django test method inside a TestCase class.

Django

from django.test import TestCase

class ProductTest(TestCase):
    def test_product(self)
        self.assertTrue(True)

A

def test_product(self):
self.assertTrue(True)

B

def test_product(self):
    self.assertTrue(True)

C

def test_product():
    self.assertTrue(True)

D

def test_product(self):
    assertTrue(True)

💡 Hint

Check for missing colon and indentation.

Option B correctly adds the missing colon and proper indentation for the method body.

🧠 Conceptual

expert

Which option best describes Django's test database behavior?

When running Django model tests, what happens to the test database after tests complete?

A The test database is created once and reused for all test runs without deletion

B The test database is the same as the development database and is not deleted

C The test database is created before tests and destroyed after tests finish

D The test database is created after tests finish

💡 Hint

Think about how Django isolates tests from your real data.

Django creates a separate test database before tests run and deletes it after tests finish to keep tests isolated.