pytest-xdist installation - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding pytest-xdist Installation Command

Which command correctly installs pytest-xdist using pip for Python?

A pip install pytest-xdist

B pip install pytest xdist

C pip install pytest-xdist --upgrade

D pip install pytest_xdist

💡 Hint

Think about the exact package name and how pip installs packages with hyphens.

The correct package name is pytest-xdist. The command pip install pytest-xdist installs it properly. Option A tries to install two separate packages, which is incorrect. Option A uses an underscore instead of a hyphen, which is invalid. Option A includes --upgrade, so it is not the basic install command.

❓ Predict Output

intermediate

Output of pytest-xdist Version Check

What is the output when running pytest --version after installing pytest-xdist?

PyTest

pytest --version

A pytest 7.0.1 (plugin: xdist-3.2.1)

B pytest 7.0.1 (pytest-xdist 3.2.1) installed

C pytest 7.0.1 (plugins: xdist-3.2.1)

D This is pytest version 7.0.1 with xdist plugin 3.2.1

💡 Hint

Look for the exact format pytest uses to show plugins in version output.

Pytest shows plugins in parentheses with the format (plugins: xdist-3.2.1). Option C matches this format exactly. Other options have incorrect wording or punctuation.

❓ assertion

advanced

Correct Assertion for Parallel Test Execution

Which assertion correctly verifies that tests ran in parallel using pytest-xdist with 4 CPUs?

PyTest

result = run_pytest_with_xdist(cpus=4)
# result.stdout contains test run summary

A assert 'gw0' in result.stdout and 'gw3' in result.stdout

B assert 'gw1' not in result.stdout and 'gw4' in result.stdout

C assert 'gw0' in result.stdout and 'gw4' in result.stdout

D assert 'gw0' in result.stdout and 'gw5' in result.stdout

💡 Hint

Worker IDs start at 0 and go up to number of CPUs minus one.

When running with 4 CPUs, worker IDs are gw0, gw1, gw2, and gw3. Option A correctly checks for gw0 and gw3 presence. Options A, C, and D check for invalid worker IDs (gw4 or gw5) or absence of valid ones.

🔧 Debug

advanced

Debugging pytest-xdist Installation Failure

You run pip install pytest-xdist but get an error: ERROR: Could not find a version that satisfies the requirement pytest-xdist. What is the most likely cause?

A Your Python version is too new and incompatible with pytest-xdist

B You typed the package name incorrectly as pytest_xdist

C You forgot to activate your virtual environment before installing

D You are using an outdated pip version that does not support the package

💡 Hint

Consider compatibility between pip and package indexes.

An outdated pip version often cannot find or install newer packages. Option D is incorrect because the command was correct. Option D is unlikely because pytest-xdist supports recent Python versions. Option D would not cause this specific error.

❓ framework

expert

Configuring pytest-xdist for Parallel Tests in pytest.ini

Which pytest.ini configuration correctly sets pytest-xdist to run tests in 3 parallel processes?

PyTest

[pytest]
addopts = 

A

[pytest]
addopts = --dist=loadscope -n3

B

[pytest]
addopts = -n 3 --dist=loadfile

C

[pytest]
addopts = -n=3 --dist=loadfile

D

[pytest]
addopts = -n 3

💡 Hint

Check the correct syntax for number of workers and distribution mode.

Option B correctly uses -n 3 to specify 3 workers and --dist=loadfile for distribution mode. Option B misses distribution mode. Option B has no space between -n and 3. Option B uses an invalid syntax -n=3.