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How the pipeline fits together
BackstopJS captures pages defined by scenarios, then compares them with an approved reference set. A GitLab job needs to provide four things: the pinned tool and its browser environment, the app URL the runner can reach, the approved references, and an exit status that reflects the test result. JUnit XML is an additional reporting channel, not a replacement for the test command.
- Install: commit BackstopJS as a project dependency and commit the lockfile so local and CI installations select the same version.
- Configure: define at least one viewport and one or more scenarios, each with a label and URL.
- Prepare: provide the app and approved reference images before the test runs.
- Test and report: run
backstop testand upload the generated JUnit XML.
Check the Node.js and BackstopJS versions
The package metadata snapshot for BackstopJS 6.3.25 specifies Node.js 16 or later and npm 8 or later. This is a version-specific requirement, not a promise about every BackstopJS release. Check the version selected by your lockfile and its installed package documentation before choosing the CI image; the project README is on a moving branch, so defaults can change. See the BackstopJS 6.3.25 package metadata and BackstopJS project README.
Configure scenarios and establish references
Initialize the project
Install BackstopJS locally in the project, then initialize its configuration:
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npm install --save-dev backstopjs
npx backstop initCommit the resulting configuration and lockfile. A basic setup defines viewports and scenarios. Each scenario needs a label and a URL; the URL can be absolute or project-local, but in CI it must resolve from the runner’s network context. The app is not necessarily reachable at the same hostname inside a container as it is on a developer’s machine.
Create and review the baseline
BackstopJS’s workflow uses init, test, and approve. Run the tests against the intended app state and review the captured results before approving them. backstop approve promotes the latest test captures into the reference set, changing the baseline used by future tests. Do not automatically approve every failing run: doing so can turn a real regression into the new expected appearance.
Make the approved references available to the GitLab job, commonly by committing them to the repository. If your pipeline generates or retrieves them another way, ensure that happens before testing and that the resulting files match the intended baseline.
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Enable BackstopJS CI reporting
In the BackstopJS configuration, enable the CI reporter, for example with "report": ["CI"]. The README says this reporter produces JUnit XML by default and allows the report directory and filename to be customized. Its documented default filename is xunit.xml; configure paths.ci_report if you want the report in a particular directory. GitLab’s report path must match the file BackstopJS actually writes.
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This is a starting pattern, not a tested, universal pipeline. Select a Node image compatible with the pinned BackstopJS version and your app. Replace the build and app-start steps with commands that suit the project, and make the app reachable from the test process.
visual_regression:
stage: test
script:
- npm ci
- npm run build
# Start or connect to the application here; it must be reachable by the runner.
- npx backstop test
artifacts:
when: always
paths:
- backstop_data/ci_report/
reports:
junit: backstop_data/ci_report/xunit.xmlThe sample assumes the CI report is configured to write to backstop_data/ci_report/. If you change the BackstopJS report directory or filename, update both GitLab artifact entries accordingly. GitLab accepts a JUnit filename, glob pattern, or array of XML report paths; it does not accept a directory alone as the JUnit report path.
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Make the app available to the test job
If the app is built or served in another job, arrange the pipeline dependency and network route so the visual-test job can access it. The correct hostname and routing depend on the runner executor, container setup, and deployment design. A scenario URL that works on a developer’s laptop may not work from a GitLab runner.
Make failed comparisons fail the pipeline
GitLab’s unit test report documentation states: “Unit test reports require the JUnit XML format and do not affect job status. To make a job fail when tests fail, your job’s script must exit with a non-zero status.” In other words, publishing the XML is not a merge gate by itself. The shell command’s exit status controls whether the job fails.
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Choose a rendering approach
| Approach | When it helps | Trade-offs to check |
|---|---|---|
| Run BackstopJS directly in the CI job | A simpler runner setup when the job environment already has the browser dependencies BackstopJS needs. | Rendering can vary with the browser and system libraries available in that environment. Verify that generated artifacts are writable and that the app URL is reachable. |
Use BackstopJS’s --docker rendering option |
When you want a versioned BackstopJS rendering image to reduce differences between environments. | The runner must be able to invoke Docker and have the required permissions. Check container networking and filesystem ownership for reports and screenshots. |
BackstopJS documents --docker as an option that invokes Docker and uses a versioned BackstopJS image by default. For CI-like output where the command is piped, its README advises removing -t from the default Docker command template. Container access, permissions, and whether Docker is available depend on the GitLab runner configuration.
The README’s host.docker.internal suggestion applies to the cited Mac/Windows setup for reaching a host from its Docker rendering environment. Do not assume that hostname works on a GitLab runner: test the route and use a hostname that resolves in the actual runner’s network context.
Keep test results and screenshots available
Setting artifacts:when: always asks GitLab to upload configured artifacts even when the job fails. Include the report and any diagnostic screenshots you need under artifacts:paths. GitLab’s documentation describes JUnit system-out attachment tags for screenshots, along with uploading the image files as artifacts; the report’s attachment references and artifact paths must correspond to the files your job produces.
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GitLab documents JUnit XML requirements including an .xml extension, a limit of less than 30 MB per file and less than 100 MB total per job, and that duplicate test names are ignored after the first occurrence. If a report does not appear, check the XML format, exact path, extension, artifact upload behavior, and size.
Troubleshoot common failures
| Symptom | Likely cause | What to check or change |
|---|---|---|
| Scenario cannot load its URL | The hostname or route is only valid on the developer’s machine, or the app has not started yet. | Confirm the service is running before backstop test and test the URL from the same runner/container network context as the browser. |
| GitLab shows no test report | CI reporting is not enabled, or GitLab points at a different path or filename than BackstopJS produced. | Enable "report": ["CI"], inspect the generated output, configure paths.ci_report if needed, and use the exact XML path under reports:junit. |
| The job passes despite a failed visual comparison | JUnit ingestion does not set job status, or the command/wrapper is not returning a failing exit code. | Verify the pinned version’s exit behavior with a known mismatch and ensure the script does not suppress or overwrite the command’s status. |
| Docker rendering cannot reach the app | The browser container uses a different network context from the host or service. | Verify the runner’s container networking and use a hostname routable from that container; do not copy the Mac/Windows-only hostname advice without testing. |
| Artifacts are missing after a failure | Artifacts are configured to upload only on success, paths do not match output, or container ownership prevents writing. | Set when: always, verify output locations, and inspect file permissions and runner configuration. |
| GitLab rejects or omits JUnit results | The XML extension, format, path, or size is not accepted, or duplicate names are being collapsed. | Use valid JUnit XML with an .xml extension, a file or glob rather than a directory for the report path, stay within GitLab’s documented report limits, and ensure test names are unique where distinct results matter. |
Or skip the browser setup
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Frequently Asked Questions
Does GitLab CI need to run BackstopJS inside Docker?
No. BackstopJS documents Docker rendering as an option, not a requirement; choose based on the runner environment and verify browser consistency and network access.
Can I use a JUnit report as the only merge-blocking check?
No. GitLab displays report results, but the job must exit non-zero to fail.
Is ScreenshotNeo a replacement for BackstopJS baselines?
No. ScreenshotNeo captures pages, while BackstopJS provides the reference-image comparison and approval workflow described here.
Quick Recap
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