Shared expensive resource patterns in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a fixture that runs once per module.

PyTest

import pytest

@pytest.fixture(scope=[1])
def expensive_resource():
    print("Setup expensive resource")
    yield
    print("Teardown expensive resource")

Drag options to blanks, or click blank then click option'

Afunction

Bmodule

Cclass

Dsession

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'function' scope causes the fixture to run before every test, which is inefficient for expensive resources.

The module scope makes the fixture run once per module, sharing the expensive resource among tests in that module.

2fill in blank

medium

Complete the code to use the fixture in a test function.

PyTest

def test_example([1]):
    assert True

Drag options to blanks, or click blank then click option'

Aexpensive_resource

Bresource

Cfixture

Dsetup

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the fixture name will not inject the fixture.

The test function must accept the fixture name as a parameter to use it.

3fill in blank

hard

Fix the error in the fixture scope to share the resource across all tests in all modules.

PyTest

import pytest

@pytest.fixture(scope=[1])
def global_resource():
    print("Setup global resource")
    yield
    print("Teardown global resource")

Drag options to blanks, or click blank then click option'

Afunction

Bmodule

Csession

Dclass

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'module' scope only shares the fixture within one module, not across modules.

The session scope shares the fixture across all tests in all modules during the test session.

4fill in blank

hard

Fill both blanks to create a fixture that sets up a database connection once per class and tears it down after all tests in the class.

PyTest

import pytest

@pytest.fixture(scope=[1])
def db_connection():
    print("Connect to DB")
    yield
    print("Disconnect from DB")

class TestDB:
    def test_query1(self, [2]):
        assert True

Drag options to blanks, or click blank then click option'

Aclass

Bdb_connection

Cmodule

Dfunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'function' scope causes the fixture to run before every test method, not once per class.

Using class scope makes the fixture run once per test class. The test method must accept the fixture name db_connection to use it.

5fill in blank

hard

Fill all three blanks to create a session-scoped fixture that returns a resource and is used in a test.

PyTest

import pytest

@pytest.fixture(scope=[1])
def shared_resource():
    resource = "Expensive Resource"
    yield resource
    print("Cleanup resource")

def test_use_resource([2]):
    assert [3] == "Expensive Resource"

Drag options to blanks, or click blank then click option'

Asession

Bshared_resource

Dmodule

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the fixture parameter and assertion variable causes errors.

The fixture uses session scope to share the resource across all tests. The test function accepts the fixture name shared_resource and asserts the returned value.