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Covered in this doc

Installing Percy for Java with Selenium
Importing the Percy selenium library
Creating a new Percy object with a WebDriver instance as a parameter
Calling and configuring Percy snapshots

percy-java-selenium on GitHub

Installation

npm install @percy/cli:

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

Add percy-java-selenium to your project dependencies. If you're using Maven:

<dependency>
  <groupId>io.percy</groupId>
  <artifactId>percy-java-selenium</artifactId>
  <version>1.0.0</version>
</dependency>

If you're using a different build system, see https://search.maven.org/artifact/io.percy/percy-java-selenium for details for your specific system.

Usage

This is an example test using the percy.snapshot function.

// import ...
import io.percy.selenium.Percy;

public class Example {
  private static WebDriver driver;
  private static Percy percy;

  public static void main(String[] args) {
    FirefoxOptions options = new FirefoxOptions();
    options.setHeadless(true);
    driver = new FirefoxDriver(options);
    percy = new Percy(driver);

    driver.get("https://example.com");
    percy.snapshot("Java 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 -- [java test command]
[percy] Percy has started!
[percy] Created build #1: https://percy.io/[your-project]
[percy] Snapshot taken "Java example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Configuration

The snapshot method arguments:

percy.snapshot(name, widths[], minHeight, enableJavaScript, percyCSS)

• name (required) - The snapshot name; must be unique to each snapshot
• Additional snapshot options (overrides any project options):
  • widths - An array of widths to take screenshots at
  • minHeight - The minimum viewport height to take screenshots at
  • enableJavaScript - Enable JavaScript in Percy's rendering environment
  • percyCSS - Percy specific CSS only applied in Percy's rendering environment

Upgrading

Automatically with @percy/migrate

We built a tool to help automate migrating to the new CLI toolchain! Migrating can be done by running the following commands and following the prompts:

$ npx @percy/migrate
? Are you currently using percy-java-selenium? Yes
? Install @percy/cli (required to run percy)? Yes
? Migrate Percy config file? Yes

This will automatically run the changes described below for you.

Manually

Installing @percy/cli & removing @percy/agent

If you're coming from a pre-3.0 version of this package, make sure to install @percy/cli after upgrading to retain any existing scripts that reference the Percy CLI command. You will also want to uninstall @percy/agent, as it's been replaced by @percy/cli.

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

Migrating Config

If you have a previous Percy configuration file, migrate it to the newest version with the config:migrate command:

$ percy config:migrate

Global Configuration

You can also configure Percy to use the same options over all snapshots. To see supported configuration including widths read our SDK configuration docs