@pytest.mark.xfail for expected failures - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mark the test as expected to fail using pytest.

PyTest

import pytest

@pytest.mark.[1]
def test_example():
    assert 1 == 2

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

Askip

Bparametrize

Cxfail

Dfixture

Attempts:

3 left

💡 Hint

Common Mistakes

Using @pytest.mark.skip instead of @pytest.mark.xfail

Forgetting to add the decorator

Using @pytest.mark.fixture which is for setup, not expected failures

The @pytest.mark.xfail decorator marks a test as expected to fail.

2fill in blank

medium

Complete the code to mark the test as expected to fail only if the condition is True.

PyTest

import pytest

@pytest.mark.xfail(condition=[1])
def test_conditional():
    assert 0 == 1

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

ATrue

BFalse

CNone

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or None which are falsy and will not mark the test as expected fail

Using False which disables the xfail

Setting condition=True means the test is expected to fail.

3fill in blank

hard

Fix the error in the code to correctly mark the test as expected to fail with a reason.

PyTest

import pytest

@pytest.mark.xfail(reason=[1])
def test_reason():
    assert False

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

AKnown bug

B"Known bug"

C'Known bug

DKnown bug"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the reason string

Using mismatched quotes causing syntax errors

The reason must be a string literal enclosed in quotes.

4fill in blank

hard

Fill both blanks to mark the test as expected to fail only on Python 3.12 and provide a reason.

PyTest

import pytest
import sys

@pytest.mark.xfail(sys.version_info[:2] == [1], reason=[2])
def test_version():
    assert False

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A(3, 12)

B"Fails on 3.12"

C'Fails on 3.12'

D(3, 11)

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong version tuple

Not quoting the reason string

Using mismatched quotes

The condition checks if Python version is 3.12, and the reason is a string explaining the failure.

5fill in blank

hard

Fill all three blanks to mark the test as expected to fail with a reason and strict mode enabled.

PyTest

import pytest

@pytest.mark.xfail(condition=[1], reason=[2], strict=[3])
def test_strict():
    assert False

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

ATrue

B"Strict mode enabled"

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using False for condition which disables xfail

Not quoting the reason string

Using False for strict which allows unexpected passes

condition=True enables xfail to expect failure, reason provides explanation, strict=True treats unexpected passes as errors.