Pytest plugin for Playwright

Write end-to-end tests for your web apps with Playwright and pytest.

• Support for all modern browsers including Chromium, WebKit and Firefox.
• Support for headless and headed execution.
• Built-in fixtures that provide browser primitives to test functions.

Usage

pip install pytest-playwright

Use the page fixture to write a basic test. See more examples.

def test_example_is_working(page):
    page.goto("https://example.com")
    assert page.inner_text('h1') == 'Example Domain'
    page.click("text=More information")

To run your tests, use pytest CLI.

# Run tests (Chromium and headless by default)
pytest

# Run tests in headed mode
pytest --headed

# Run tests in a different browser (chromium, firefox, webkit)
pytest --browser firefox

# Run tests in multiple browsers
pytest --browser chromium --browser webkit

If you want to add the CLI arguments automatically without specifying them, you can use the pytest.ini file:

# content of pytest.ini
[pytest]
# Run firefox with UI
addopts = --headed --browser firefox

Fixtures

This plugin configures Playwright-specific fixtures for pytest. To use these fixtures, use the fixture name as an argument to the test function.

def test_my_app_is_working(fixture_name):
    # Test using fixture_name
    # ...

Function scope: These fixtures are created when requested in a test function and destroyed when the test ends.

• context: New browser context for a test.
• page: New browser page for a test.

Session scope: These fixtures are created when requested in a test function and destroyed when all tests end.

• browser: Browser instance launched by Playwright.
• browser_name: Browser name as string.
• is_chromium, is_webkit, is_firefox: Booleans for the respective browser types.

Customizing fixture options: For browser and context fixtures, use the the following fixtures to define custom launch options.

• browser_type_launch_args: Override launch arguments for browserType.launch(). It should return a Dict.
• browser_context_args: Override the options for browser.new_context(). It should return a Dict.

Examples

Configure Mypy typings for auto-completion

from playwright.sync_api import Page

def test_visit_admin_dashboard(page: Page):
    page.goto("/admin")
    # ...

Configure slow mo

Run tests with slow mo with the --slowmo argument.

pytest --slowmo 100

Skip test by browser

import pytest

@pytest.mark.skip_browser("firefox")
def test_visit_example(page):
    page.goto("https://example.com")
    # ...

Run on a specific browser

import pytest

@pytest.mark.only_browser("chromium")
def test_visit_example(page):
    page.goto("https://example.com")
    # ...

Run with a custom browser channel like Google Chrome or Microsoft Edge

pytest --browser-channel chrome # or chrome-beta, chrome-dev, chrome-canary, msedge, msedge-beta, msedge-dev, msedge-canary

def test_example(page):
    page.goto("https://example.com")

Configure base-url

Start Pytest with the base-url argument.

pytest --base-url http://localhost:8080

def test_visit_example(page):
    page.goto("/admin")
    # -> Will result in http://localhost:8080/admin

Ignore HTTPS errors

conftest.py

import pytest

@pytest.fixture(scope="session")
def browser_context_args(browser_context_args):
    return {
        **browser_context_args,
        "ignore_https_errors": True
    }

Use custom viewport size

conftest.py

import pytest

@pytest.fixture(scope="session")
def browser_context_args(browser_context_args):
    return {
        **browser_context_args,
        "viewport": {
            "width": 1920,
            "height": 1080,
        }
    }

Device emulation

conftest.py

import pytest

@pytest.fixture(scope="session")
def browser_context_args(browser_context_args, playwright):
    iphone_11 = playwright.devices['iPhone 11 Pro']
    return {
        **browser_context_args,
        **iphone_11,
    }

Debugging

Use with pdb

Use the breakpoint() statement in your test code to pause execution and get a pdb REPL.

def test_bing_is_working(page):
    page.goto("https://bing.com")
    breakpoint()
    # ...

Screenshot on test failure

You can capture screenshots for failed tests with a pytest runtest hook. Add this to your conftest.py file.

Note that this snippet uses slugify to convert test names to file paths, which can be installed with pip install python-slugify.

# In conftest.py
from slugify import slugify
from pathlib import Path

def pytest_runtest_makereport(item, call) -> None:
    if call.when == "call":
        if call.excinfo is not None and "page" in item.funcargs:
            page = item.funcargs["page"]
            screenshot_dir = Path(".playwright-screenshots")
            screenshot_dir.mkdir(exist_ok=True)
            page.screenshot(path=str(screenshot_dir / f"{slugify(item.nodeid)}.png"))

Deploy to CI

Use the Playwright GitHub Action or guides for other CI providers to deploy your tests to CI/CD

Special thanks

Thanks to Max Schmitt for creating and maintaining this project.