Integrate your Nightmare tests with Percy
A guide to integrating your Nightmare automated tests with BrowserStack Percy. Catch visual differences in your web application on time.
This documentation applies to Percy Nightmare SDK version 2.0.0 and above.
Integrate Percy with your test suite to run visual tests. To do that, follow these steps:
Create a Percy project
Sign in to Percy. In Percy, create a project of the type, Web, and then name the project. After the project is created, Percy generates a token. Make a note of it. You have to use it set your environment variable in the next step.
For details on creating a project, see Create a Percy project.
Set the project token as an environment variable
Run the given command to set PERCY_TOKEN as an environment variable:
To learn about environment variables in Percy, see Percy environment variables.
Install Percy dependencies
Install the components required to establish the integration environment for your test suite.
To install the dependencies, run the following command:
Update your test script
Import the Percy library to use the method and attributes required to take screenshots.
The following example uses the percySnapshot function:
The snapshot method arguments are:
-
name(required) - The snapshot name; must be unique to each snapshot -
options- See per-snapshot configuration options
To learn more, see Percy snapshot.
Run Percy
Run your tests using the percy exec command as shown below:
If you are unable to use the percy:exec command or prefer to run your tests using IDE run options, you can use the percy exec:start and percy exec:stop commands. To learn more, visit Run Percy.
This command starts Percy, create a new Percy build, takes snapshots and uploads them to your project, and stops Percy:
Congratulations!
You have successfully created your first build on Percy. To see the build with snapshots of your application, visit your project in Percy.
When you run another build with visual changes to your application, Percy takes new snapshots. You can then see the comparisons between the two runs on the new build.
Advanced topics
Percy Snapshot command
In the preceding steps, we used the Percy Snapshot command for capturing snapshots. Percy provides various configurations to use with Percy snapshot command. To learn more visit, Percy snapshot command.
Base build selection
By default, Percy uses the previous build for comparison however, you always have the option to configure the base build for comparison as needed. To learn more, visit base build selection logic.
Related topics
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