<p></p>
<blockquote>
<p dir="auto">Aren't system test using precompiled assets, and when you precompile you get all these warnings?</p>
</blockquote>
<p dir="auto">I've just tested this locally, and no, I don't get all these warnings when running system tests. I also checked that optipng is not installed, and the warning is shown when I edit <code class="notranslate">config/image_optim/test.yml</code></p>
<p dir="auto">I've also checked CI, <a href="https://github.com/openstreetmap/openstreetmap-website/blob/926229e286520ed23fb5e8add94c6048aa592412/.github/workflows/tests.yml#L58-L59">which precompiles the assets during testing</a> and again there's no warnings from image_optim - which is to be expected, since we disable them for the test environment, and any precompilation will also happen in the same environment.</p>
<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/AntonKhorev/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/AntonKhorev">@AntonKhorev</a> If you are seeing the warnings in either the development or test environments, please open an issue so that we can investigate further.</p>

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