Percy playwright python

Percy visual testing for Python Playwright.

Installation

npm install @percy/cli:

$ npm install --save-dev @percy/cli

pip install Percy playwright package:

$ pip install percy-playwright

Usage

This is an example test using the percy_snapshot function.

from percy import percy_snapshot

with sync_playwright() as playwright:
  browser = playwright.chromium.connect()
  page = browser.new_page()
  page.goto('http://example.com')
  ​
  # take a snapshot
  percy_snapshot(browser, 'Python example')

Running the test above normally will result in the following log:

[percy] Percy is not running, disabling snapshots

When running with percy exec, and your project's PERCY_TOKEN, a new Percy build will be created and snapshots will be uploaded to your project.

$ export PERCY_TOKEN=[your-project-token]
$ percy exec -- [python test command]
[percy] Percy has started!
[percy] Created build #1: https://percy.io/[your-project]
[percy] Snapshot taken "Python example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Configuration

percy_snapshot(page, name[, **kwargs])

• page (required) - A playwright page instance
• name (required) - The snapshot name; must be unique to each snapshot
• **kwargs - See per-snapshot configuration options

Percy on Automate

Usage

from playwright.sync_api import sync_playwright
from percy import percy_screenshot, percy_snapshot

desired_cap = {
  'browser': 'chrome',
  'browser_version': 'latest',
  'os': 'osx',
  'os_version': 'ventura',
  'name': 'Percy Playwright PoA Demo',
  'build': 'percy-playwright-python-tutorial',
  'browserstack.username': 'username',
  'browserstack.accessKey': 'accesskey'
}

with sync_playwright() as playwright:
  cdpUrl = 'wss://cdp.browserstack.com/playwright?caps=' + urllib.parse.quote(json.dumps(desired_cap))
  browser = playwright.chromium.connect(cdpUrl)
  page = browser.new_page()
  page.goto("https://percy.io/")
  percy_screenshot(page, name = "Screenshot 1")

take a snapshot

percy_screenshot(page, name = 'Screenshot 1')

• page (required) - A Playwright page instance
• name (required) - The screenshot name; must be unique to each screenshot
• options (optional) - There are various options supported by percy_screenshot to server further functionality.
  • sync - Boolean value by default it falls back to false, Gives the processed result around screenshot [From CLI v1.28.8]
  • full_page - Boolean value by default it falls back to false, Takes full page screenshot [From CLI v1.28.8]
  • freeze_animated_image - Boolean value by default it falls back to false, you can pass true and percy will freeze image based animations.
  • freeze_image_by_selectors -List of selectors. Images will be freezed which are passed using selectors. For this to work freeze_animated_image must be set to true.
  • freeze_image_by_xpaths - List of xpaths. Images will be freezed which are passed using xpaths. For this to work freeze_animated_image must be set to true.
  • percy_css - Custom CSS to be added to DOM before the screenshot being taken. Note: This gets removed once the screenshot is taken.
  • ignore_region_xpaths - List of xpaths. elements in the DOM can be ignored using xpath
  • ignore_region_selectors - List of selectors. elements in the DOM can be ignored using selectors.
  • custom_ignore_regions - List of custom objects. elements can be ignored using custom boundaries. Just passing a simple object for it like below.
    • example: {"top": 10, "right": 10, "bottom": 120, "left": 10}
    • In above example it will draw rectangle of ignore region as per given coordinates.
      • top (int): Top coordinate of the ignore region.
      • bottom (int): Bottom coordinate of the ignore region.
      • left (int): Left coordinate of the ignore region.
      • right (int): Right coordinate of the ignore region.
  • consider_region_xpaths - List of xpaths. elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using xpaths.
  • consider_region_selectors - List of selectors. elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using selectors.
  • custom_consider_regions - List of custom objects. elements can be considered for diffing and will be ignored by Intelli Ignore using custom boundaries
    • example:{"top": 10, "right": 10, "bottom": 120, "left": 10}
    • In above example it will draw rectangle of consider region will be drawn.
    • Parameters:
      • top (int): Top coordinate of the consider region.
      • bottom (int): Bottom coordinate of the consider region.
      • left (int): Left coordinate of the consider region.
      • right (int): Right coordinate of the consider region.
  • regions parameter that allows users to apply snapshot options to specific areas of the page. This parameter is an array where each object defines a custom region with configurations.
    • Parameters:

      • elementSelector (optional, only one of the following must be provided, if this is not provided then full page will be considered as region)

        • boundingBox (object): Defines the coordinates and size of the region.
          • x (number): X-coordinate of the region.
          • y (number): Y-coordinate of the region.
          • width (number): Width of the region.
          • height (number): Height of the region.
        • elementXpath (string): The XPath selector for the element.
        • elementCSS (string): The CSS selector for the element.

      • algorithm (mandatory)

        • Specifies the snapshot comparison algorithm.
        • Allowed values: standard, layout, ignore, intelliignore.

      • configuration (required for standard and intelliignore algorithms, ignored otherwise)

        • diffSensitivity (number): Sensitivity level for detecting differences.
        • imageIgnoreThreshold (number): Threshold for ignoring minor image differences.
        • carouselsEnabled (boolean): Whether to enable carousel detection.
        • bannersEnabled (boolean): Whether to enable banner detection.
        • adsEnabled (boolean): Whether to enable ad detection.

      • assertion (optional)

        • Defines assertions to apply to the region.
        • diffIgnoreThreshold (number): The threshold for ignoring minor differences.

Example Usage for regions

obj1 = {
  "elementSelector": {
    "elementCSS": ".ad-banner" 
  },
  "algorithm": "intelliignore",
  "configuration": {
    "diffSensitivity": 2,
    "imageIgnoreThreshold": 0.2,
    "carouselsEnabled": true,
    "bannersEnabled": true,
    "adsEnabled": true
  },
  "assertion": {
    "diffIgnoreThreshold": 0.4,
  }
};

# we can use the createRegion function

from percy import percy_snapshot
from percy.screenshot import (create_region)

obj2 = create_region(
    algorithm="intellignore",
    diffSensitivity=2,
    imageIgnoreThreshold=0.2,
    carouselsEnabled=True,
    adsEnabled=True,
    diffIgnoreThreshold=0.4
)

percy_snapshot(page, name="Homepage", regions=[obj1]);

Creating Percy on automate build

Note: Automate Percy Token starts with auto keyword. The command can be triggered using exec keyword.

$ export PERCY_TOKEN=[your-project-token]
$ percy exec -- [python test command]
[percy] Percy has started!
[percy] [Python example] : Starting automate screenshot ...
[percy] Screenshot taken "Python example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Refer to docs here: Percy on Automate