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Python Test Runners – Pytest-xdist

Below is a sample code demonstrating how Pytest-xdist can be used to run tests concurrently on multiple CPU cores, which can significantly reduce test execution time for large test suites.

To run the tests in parallel using Pytest-xdist, you can specify the number of CPUs to use with the -n option. For example, to run tests on 2 CPUs in parallel, you can run:

Pytest-xdist will execute the test cases concurrently, utilizing the available CPU cores efficiently.

# pip install pytest pytest-xdist
# tests/test_parallel_execution.py
# In this code, we have three test functions representing tasks that can run concurrently.
import pytest
import time
def test_task_1():
"""Simulate task 1 that takes some time to complete."""
time.sleep(1) # Simulate a task that takes 1 second
assert True, "Task 1 completed successfully."
def test_task_2():
"""Simulate task 2 that takes some time to complete."""
time.sleep(1) # Simulate a task that takes 1 second
assert True, "Task 2 completed successfully."
def test_task_3():
"""Simulate task 3 that takes some time to complete."""
time.sleep(1) # Simulate a task that takes 1 second
assert True, "Task 3 completed successfully."
# pytest -n 2
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