percy-selenium-ruby

Percy visual testing for Ruby Selenium.

Installation

npm install @percy/cli:

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

gem install Percy selenium package:

$ gem install percy-selenium

Usage

This is an example test using the Percy.snapshot method.

require 'percy'

driver = Selenium::WebDriver.for :firefox
driver.navigate.to "https://example.com"

# Take a snapshot
Percy.snapshot(driver, 'homepage')

driver.quit

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 -- [ruby test command]
[percy] Percy has started!
[percy] Created build #1: https://percy.io/[your-project]
[percy] Snapshot taken "Ruby example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Configuration

Percy.snapshot(driver, name[, options])

• driver (required) - A selenium-webdriver driver instance
• name (required) - The snapshot name; must be unique to each snapshot
• options - See per-snapshot configuration options

Running Percy on Automate

Percy.percy_screenshot(driver, name, options) [ needs @percy/cli 1.27.0-beta.0+ ]

This is an example test using the percy_screenshot method.

require 'percy'

capabilities = {
  'browserName' => 'chrome',
  'bstack:options' => {
    'userName' => '<your-username>',
    'accessKey' => '<your-access-key>'
  }
}

driver = Selenium::WebDriver.for(
  :remote,
  url: 'https://hub-cloud.browserstack.com/wd/hub',
  capabilities: capabilities
)

driver.navigate.to "https://example.com"

# Take a Percy screenshot
Percy.percy_screenshot(driver, 'Screenshot 1')

driver.navigate.to "https://google.com"
Percy.percy_screenshot(driver, 'Screenshot 2')

driver.quit

• driver (required) - A Selenium driver instance
• name (required) - The screenshot name; must be unique to each screenshot
• options (optional) - There are various options supported by percy_screenshot to serve further functionality.
  • sync - Boolean value by default it falls back to false, Gives the processed result around screenshot [From CLI v1.28.0-beta.0+]
  • fullPage - Boolean value by default it falls back to false, Takes full page screenshot [From CLI v1.27.6+]
  • freezeAnimatedImage - Boolean value by default it falls back to false, you can pass true and Percy will freeze image based animations.
  • freezeImageBySelectors - List of selectors. Images will be frozen which are passed using selectors. For this to work freezeAnimatedImage must be set to true.
  • freezeImageByXpaths - List of xpaths. Images will be frozen which are passed using xpaths. For this to work freezeAnimatedImage must be set to true.
  • percyCSS - Custom CSS to be added to DOM before the screenshot being taken. Note: This gets removed once the screenshot is taken.
  • ignoreRegionXpaths - List of xpaths. Elements in the DOM can be ignored using xpath.
  • ignoreRegionSelectors - List of selectors. Elements in the DOM can be ignored using selectors.
  • ignoreRegionSeleniumElements - List of Selenium WebElement. Elements can be ignored using selenium elements.
  • customIgnoreRegions - List of custom objects. Elements can be ignored using custom boundaries. Just passing a simple hash for it like below.
    • example: {top: 10, right: 10, bottom: 120, left: 10}
    • In the above example it will draw a 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.
  • considerRegionXpaths - List of xpaths. Elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using xpaths.
  • considerRegionSelectors - List of selectors. Elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using selectors.
  • considerRegionSeleniumElements - List of Selenium WebElement. Elements can be considered for diffing and will be ignored by Intelli Ignore using selenium elements.
  • customConsiderRegions - 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 the above example a 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 (hash): 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

region1 = {
  elementSelector: {
    elementCSS: '.ad-banner'
  },
  algorithm: 'intelliignore',
  configuration: {
    diffSensitivity: 2,
    imageIgnoreThreshold: 0.2,
    carouselsEnabled: true,
    bannersEnabled: true,
    adsEnabled: true
  },
  assertion: {
    diffIgnoreThreshold: 0.4
  }
}

# Using Percy.create_region helper
region2 = Percy.create_region(
  algorithm: 'intelliignore',
  diff_sensitivity: 3,
  ads_enabled: true,
  diff_ignore_threshold: 0.4
)

Percy.percy_screenshot(driver, 'Screenshot 1', regions: [region1, region2])

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 -- [ruby test command]
[percy] Percy has started!
[percy] [Ruby example] : Starting automate screenshot ...
[percy] Screenshot taken "Ruby example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Refer to docs here: Percy on Automate