Running tests in parallel

When we have a lot of test cases in our framework, it takes a lot of time to execute all the test cases.Instead of running tests sequentially, or one after the other, parallel testing allows us to execute multiple tests at the same and decrease the time taken. Parallel testing helps to faster testing and has a quicker turn around in release process.

To run tests in parallel using pytest, we need pytest-xdist plugin which extends pytest with some unique test execution modes.

Let's first install pytest-xdist plug-in by running below command

pip install pytest-xdist

after installing pytest-xdist module, you can execute your scripts parallely.

Let’s look at the example below. 

First create conftest.py file like below 

import pytest
from selenium import webdriver

@pytest.fixture
def WebDriver():
    base_url = "http://automationpractice.com/"
    chromePath = "C:\\executables\\chromedriver.exe"
    driver = webdriver.Chrome(executable_path=chromePath)
    driver.get(base_url)
    return driver

Now create test file test_parallel.py and add below code here we are using two test methods. 

import pytest
import time

def test_one(WebDriver):
    WebDriver.find_element_by_xpath("//a[@title='Log in to your customer account']").click()
     WebDriver.find_element_by_xpath("//input[@id='email']").send_keys("abc111@gmail.com")
    WebDriver.find_element_by_xpath("//input[@name='passwd']").send_keys("abcd1234")
    WebDriver.find_element_by_xpath("//button[@type='submit' and @id='SubmitLogin']").click()


def test_two(WebDriver):
    WebDriver.find_element_by_xpath("//a[@title='Log in to your customer account']").click()    WebDriver.find_element_by_xpath("//input[@id='email']").send_keys("abc111@gmail.com")
    WebDriver.find_element_by_xpath("//input[@name='passwd']").send_keys("abcd12341")
    WebDriver.find_element_by_xpath("//button[@type='submit' and @id='SubmitLogin']").click()
     errormsg= WebDriver.find_element_by_xpath("//div[@class='alert alert-danger']//li").text
    assert (errormsg=="Authentication failed.")

Now execute the tests. In PyTest, to execute tests just type pytest in the terminal in the project root folder / tests folder. This will execute all tests.

Pytest test_parallel.py -v -n 2

-n <num> runs the tests by using multiple workers, here it is 2.