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diff --git a/tests/t0005-markup.sh b/tests/t0005-markup.sh
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+#!/bin/sh
+
+# Guards the hooks the README promises a site stylesheet or script, so a
+# rename in the markup fails here instead of in someone's theme. Each check
+# names the page it renders and the attribute or element it expects.
+
+test_description='Check the markup hooks a theme relies on'
+. ./setup.sh
+
+test_expect_success 'set up a repository with a file that has an extension' '
+	mkrepo repos/hooks 2 &&
+	(
+		cd repos/hooks &&
+		mkdir dir &&
+		echo "int x;" >dir/hello.c &&
+		git add dir &&
+		git commit -m sources
+	) &&
+	{
+		echo "virtual-root=/" &&
+		echo "cache-size=0" &&
+		echo "enable-blame=1" &&
+		echo "max-stats=year" &&
+		echo "readme=:file-1" &&
+		echo "repo.url=hooks" &&
+		echo "repo.path=$PWD/repos/hooks/.git"
+	} >hooksrc
+'
+
+hooks() { CGIT_CONFIG="$PWD/hooksrc" QUERY_STRING="url=$1" cgit; }
+
+test_expect_success 'the root names the page and the repository' '
+	hooks "" >tmp &&
+	grep "<div id=.cgit. data-page=.repolist.>" tmp &&
+	hooks "hooks/log/" >tmp &&
+	grep "<div id=.cgit. data-page=.log. data-repo=.hooks.>" tmp
+'
+
+test_expect_success 'the landmarks and the search form are in place' '
+	grep "<header id=.header.>" tmp &&
+	grep "<nav class=.tabs. aria-label=.Pages.>" tmp &&
+	grep "<form class=.search. role=.search." tmp &&
+	grep "<main class=.content.>" tmp &&
+	grep "<footer class=.footer.>" tmp
+'
+
+test_expect_success 'the listings name themselves, their sections and their rows' '
+	grep "<table class=.list log. aria-label=.Commits.>" tmp &&
+	grep "<tbody class=.log.>" tmp &&
+	grep "<tr class=.commit.>" tmp &&
+	grep "class=.active. aria-current=.page." tmp &&
+	grep "<th class=.left. scope=.col.>" tmp &&
+	hooks "" >tmp &&
+	grep "<table class=.list repolist. aria-label=.Repositories.>" tmp &&
+	grep "<tbody class=.repos.>" tmp &&
+	grep "<tr class=.repo.>" tmp &&
+	hooks "hooks/" >tmp &&
+	grep "<table class=.list summary. aria-label=.Summary.>" tmp &&
+	grep "<tbody class=.branches.>" tmp &&
+	grep "<tr class=.branch.>" tmp &&
+	hooks "hooks/tree/" >tmp &&
+	grep "<table class=.list tree. aria-label=.Files.>" tmp &&
+	grep "<tr class=.dir.>" tmp &&
+	grep "<tr class=.blob.>" tmp &&
+	hooks "hooks/tree/dir/" >tmp &&
+	grep "class=.ls-blob ext-c." tmp
+'
+
+test_expect_success 'the diff pages wrap each file and label their controls' '
+	hooks "hooks/commit/" >tmp &&
+	grep "<table class=.commit-info.>" tmp &&
+	grep "<th scope=.row.>author</th>" tmp &&
+	grep "<div class=.file. data-path=.dir/hello.c.>" tmp &&
+	grep "<label for=.diff-context.>" tmp &&
+	grep "<select id=.diff-context. name=.context.>" tmp &&
+	grep "<form method=.get. aria-label=.Diff options.>" tmp &&
+	hooks "hooks/diff/&ss=1" >tmp &&
+	grep "<tbody class=.file. data-path=.dir/hello.c.>" tmp &&
+	hooks "hooks/stats/" >tmp &&
+	grep "<label for=.stats-authors.>" tmp
+'
+
+test_expect_success 'the blob, blame and about pages open with their own containers' '
+	hooks "hooks/tree/dir/hello.c" >tmp &&
+	grep "<div class=.blob-header.>" tmp &&
+	grep "<a id=.n1." tmp &&
+	hooks "hooks/blame/dir/hello.c" >tmp &&
+	grep "<div class=.blob-header.>" tmp &&
+	hooks "hooks/about/" >tmp &&
+	grep "<div id=.about.>" tmp
+'
+
+test_expect_success 'the stylesheet and the script name only the current hooks' '
+	! grep "_dark\|#summary\|ul.pager\|td:empty" "$TEST_OUTPUT_DIRECTORY/../assets/cgit.css" &&
+	grep "window.cgit.updateAges" "$TEST_OUTPUT_DIRECTORY/../assets/cgit.js" &&
+	grep "window.cgit.highlightLines" "$TEST_OUTPUT_DIRECTORY/../assets/cgit.js"
+'
+
+test_done