Migrate anchors_include_text_between_but_not_anchor_comments to BookTest

tests/rendered_output.rs

@@ -127,20 +127,6 @@ fn rendered_code_does_not_have_playground_stuff_in_html_when_disabled_in_config(
     assert_doesnt_contain_strings(nested, &playground_class);
 }
 
-#[test]
-fn anchors_include_text_between_but_not_anchor_comments() {
-    let temp = DummyBook::new().build().unwrap();
-    let md = MDBook::load(temp.path()).unwrap();
-    md.build().unwrap();
-
-    let nested = temp.path().join("book/first/nested.html");
-    let text_between_anchors = vec!["unique-string-for-anchor-test"];
-    let anchor_text = vec!["ANCHOR"];
-
-    assert_contains_strings(nested.clone(), &text_between_anchors);
-    assert_doesnt_contain_strings(nested, &anchor_text);
-}
-
 #[test]
 fn rustdoc_include_hides_the_unspecified_part_of_the_file() {
     let temp = DummyBook::new().build().unwrap();

tests/testsuite/includes.rs

@@ -23,3 +23,18 @@ fn include() {
 "##]],
         );
 }
+
+// Checks for anchored includes.
+#[test]
+fn anchored_include() {
+    BookTest::from_dir("includes/all_includes").check_main_file(
+        "book/anchors.html",
+        str![[r##"
+<h1 id="include-anchors"><a class="header" href="#include-anchors">Include Anchors</a></h1>
+<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
+</span><span class="boring">fn main() {
+</span>let x = 1;
+<span class="boring">}</span></code></pre></pre>
+"##]],
+    );
+}