playwright/docs/src/test-runners-python.md

id	title
test-runners	Pytest plugin

Write end-to-end tests for your web apps with Pytest.

Usage

pip install pytest-playwright

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

# test_my_application.py
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

CLI arguments

• --headed: Run tests in headed mode (default: headless).
• --browser: Run tests in a different browser chromium, firefox, or webkit. It can be specified multiple times (default: all browsers).
• --browser-channel Browser channel to be used.
• --slowmo Run tests with slow mo.
• --device Device to be emulated.
• --output Directory for artifacts produced by tests (default: test-results).
• --tracing Whether to record a trace for each test. on, off, or retain-on-failure (default: off).
• --video Whether to record video for each test. on, off, or retain-on-failure (default: off).
• --screenshot Whether to automatically capture a screenshot after each test. on, off, or only-on-failure (default: off).

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.
• browser_channel: Browser Channel 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 [method: BrowserType.launch]. It should return a Dict.
• browser_context_args: Override the options for [method: Browser.newContext]. It should return a Dict.

Examples

Configure Mypy typings for auto-completion

# test_my_application.py
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

# test_my_application.py
import pytest

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

Run on a specific browser

# conftest.py
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

# test_my_application.py
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

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

Ignore HTTPS errors

# conftest.py
import pytest

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

Device emulation

# conftest.py
import pytest

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

Or via the CLI --device="iPhone 11 Pro"

Persistent context

# conftest.py
import pytest
from playwright.sync_api import BrowserType
from typing import Dict

@pytest.fixture(scope="session")
def context(
    browser_type: BrowserType,
    browser_type_launch_args: Dict,
    browser_context_args: Dict
):
    context = browser_type.launch_persistent_context("./foobar", **{
        **browser_type_launch_args,
        **browser_context_args,
        "locale": "de-DE",
    })
    yield context
    context.close()

When using that all pages inside your test are created from the persistent context.

Using with unittest.TestCase

See the following example for using it with unittest.TestCase. This has a limitation, that only a single browser can be specified and no matrix of multiple browsers gets generated when specifying multiple.

import pytest
import unittest

from playwright.sync_api import Page


class MyTest(unittest.TestCase):
    @pytest.fixture(autouse=True)
    def setup(self, page: Page):
        self.page = page

    def test_foobar(self):
        self.page.goto("https://microsoft.com")
        self.page.click("#foobar")
        assert self.page.evaluate("1 + 1") == 2

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()
    # ...

Deploy to CI

See the guides for CI providers to deploy your tests to CI/CD.