[ekamran]

test_remove_pdf_alpha_channel_should_remove_the_alpha_channel_in_preview() fails when Imagick is installed but Ghostscript is not, with "The intermediate size could not be retrieved."

The test skips only when wp_image_editor_supports() reports no PDF support. That check uses Imagick::queryFormats(), which still lists PDF when Ghostscript is missing, as noted in https://core.trac.wordpress.org/ticket/45813. So the test runs, no preview is generated, and the assertion fails.

The four PDF tests in tests/phpunit/tests/image/functions.php already skip in this case. r48341 gave them a second check that loads the file with wp_get_image_editor(). This test was added later, in r56271, without it. This PR adds the same check.

Where it shows up:

• The phpunit-test-runner output records this one PHPUnit failure on current master, for example https://github.com/WordPress/phpunit-test-runner/actions/runs/38256520334. That CI runs on GitHub's ubuntu-24.04 image, which does not list Ghostscript in its installed software.
• It was also seen locally in Media: Use imageflip() in WP_Image_Editor_GD::flip(). #13920.
• It does not show on the host test results page. None of the 210 reports from 11 hosts for r64301 to r64315 list this test.

Testing

I ran the alpha channel test and the four functions.php PDF tests on Ubuntu 24.04 (PHP 8.3.6, ImageMagick 6.9.12-98) and on the wordpressdevelop/php image (PHP 8.3.35, ImageMagick 7.1.1-43). In the image, I renamed /usr/bin/gs for the runs without Ghostscript.

• trunk, no Ghostscript: the alpha channel test fails, the other four are skipped.
• This PR, no Ghostscript: all five are skipped with "File is not an image."
• trunk and this PR, with Ghostscript: all five pass, 21 assertions.

Both environments gave the same results. vendor/bin/phpcs on the changed file is clean.

Trac ticket: https://core.trac.wordpress.org/ticket/65819

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code, Codex (testing and review)
The investigation, verification and final decisions are mine, and I take responsibility for the change.

[github-actions]

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Props ekamran.

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[lancewillett]

PR #14214 landed in https://core.trac.wordpress.org/changeset/64318

[Copilot]

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Copilot review overview

1 open finding

• After this guard, $editor is not used again in the shown diff. To keep the intent clear and avoid… · New

What changed in this PR

Updates the Imagick PDF alpha-channel test to skip when WordPress cannot actually load the PDF (e.g., Imagick present but Ghostscript missing), aligning behavior with existing PDF tests.

Changes:

• Adds a wp_get_image_editor() loadability check before running the PDF preview/assertions.
• Skips the test with the underlying WP_Error message when the editor cannot load the PDF.

File	Description
tests/​phpunit/​tests/​image/​editorImagick.php	Adds an editor instantiation check to skip the PDF alpha channel test when PDF loading fails (commonly due to missing Ghostscript).

🧠 Review effort: Lite

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