Fixture request object in PyTest - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of accessing fixture name via request object

What is the output of this pytest fixture and test code?

PyTest

import pytest

@pytest.fixture
def sample_fixture(request):
    return f"Fixture name is: {request.fixturename}"

def test_sample(sample_fixture):
    print(sample_fixture)

A AttributeError: 'SubRequest' object has no attribute 'fixturename'

B Fixture name is: sample_fixture

C Fixture name is: test_sample

D Fixture name is: None

💡 Hint

The request object has an attribute that holds the current fixture's name.

The 'request' fixture does not have an attribute named 'fixturename'. The correct attribute is 'fixture_name'. Accessing 'fixturename' raises an AttributeError.

❓ assertion

intermediate

Correct assertion using request.node.name in a test

Which assertion correctly verifies the current test function's name using the request fixture?

PyTest

import pytest

def test_example(request):
    test_name = request.node.name
    # Assertion here

A assert test_name == 'example_test'

B assert test_name == 'request'

C assert test_name == 'node'

D assert test_name == 'test_example'

💡 Hint

request.node.name holds the current test function's name.

The 'request.node.name' attribute contains the name of the currently running test function, which is 'test_example'.

🔧 Debug

advanced

Identify the error when accessing request.param in a fixture

What error will this pytest code raise when running the test?

PyTest

import pytest

@pytest.fixture
def my_fixture(request):
    return request.param

def test_func(my_fixture):
    assert my_fixture == 10

A AttributeError: 'SubRequest' object has no attribute 'param'

B ValueError: Fixture 'my_fixture' missing parameterization

C pytest usage error: missing @pytest.mark.parametrize decorator

D No error, test passes

💡 Hint

request.param is only available for parameterized fixtures.

The fixture uses request.param but is not parameterized with @pytest.mark.parametrize, so pytest raises a usage error indicating missing parameterization.

🧠 Conceptual

advanced

Purpose of the pytest request fixture

Which statement best describes the purpose of the pytest 'request' fixture?

A It manages database connections for tests.

B It provides information about the executing test context and allows access to fixture metadata.

C It automatically retries failed tests.

D It is used to send HTTP requests during tests.

💡 Hint

Think about what information the 'request' fixture gives inside a test or fixture.

The 'request' fixture gives access to the current test context, including test name, fixture names, and allows dynamic fixture requests.

❓ framework

expert

Using request.getfixturevalue to access another fixture dynamically

Given these fixtures, what will be the output of test_dynamic_fixture?

PyTest

import pytest

@pytest.fixture
def data_fixture():
    return 42

@pytest.fixture
def dynamic_fixture(request):
    value = request.getfixturevalue('data_fixture')
    return value + 8

def test_dynamic_fixture(dynamic_fixture):
    print(dynamic_fixture)

A 50

B NameError: name 'data_fixture' is not defined

C TypeError: getfixturevalue() missing 1 required positional argument

D 42

💡 Hint

request.getfixturevalue allows accessing other fixtures by name inside a fixture.

The 'dynamic_fixture' calls request.getfixturevalue('data_fixture') which returns 42, then adds 8, so the output is 50.