To allow us to split the Firefox ui tests across the tree on bug 1272145, we need a solution for wptserve and locally served test files. I don't see that we want to keep a single folder with test files under testing/firefox_ui/resources. Instead we could declare support_files via the manifest, and spin up a new server if needed. With that we might be able to remove the --server-root command line option. But I think we want to keep it to retain compatibility if only a single test needs to be executed for customers outside the tree. Andreas has some upcoming changes for wptserve on bug 1103196, which I might have to wait for.
Summary: Allow tests to specify their own document root for wptserve → Allow tests to specify their own document root of supporting files for wptserve
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