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Run the integration tests in headless mode in GitHub Actions #21991

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Run the integration tests in headless mode in GitHub Actions#21991
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@timvandermeij
timvandermeij
opened on Sep 20, 2026

The integration tests are currently the only workflow tests that don't run in headless mode; see:

pdf.js/.github/workflows/integration_tests.yml

Lines 77 to 83 in ccd820e

# Note that the integration tests can't run in headless mode until bug
# 1878643 (tracked in #20918), and possibly others, have been fixed
# upstream, so we can't run with the `--headless` flag and thus have to
# configure a standard resolution for the headful browser windows.
- name: Update resolution (Windows)
if: ${{ matrix.os == 'windows-latest' }}
run: Set-DisplayResolution -Width 1920 -Height 1080 -Force

One of the issues that prevented us from doing that was #20918 which is now fixed, but while more tests pass with that fix in place there are still quite a few other errors remaining in both Firefox and Chrome if headless mode is used for the integration tests.

We should try to find out why that happens so we can eventually enable headless mode for the integration tests too, which would improve consistency and perhaps also some runtime.

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