Migrate rendered_code_has_playground_stuff to BookTest

tests/rendered_output.rs

@@ -93,21 +93,6 @@ fn check_correct_relative_links_in_print_page() {
     );
 }
 
-#[test]
-fn rendered_code_has_playground_stuff() {
-    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 playground_class = vec![r#"class="playground""#];
-
-    assert_contains_strings(nested, &playground_class);
-
-    let book_js = temp.path().join("book/book.js");
-    assert_contains_strings(book_js, &[".playground"]);
-}
-
 #[test]
 fn rendered_code_does_not_have_playground_stuff_in_html_when_disabled_in_config() {
     let temp = DummyBook::new().build().unwrap();

tests/testsuite/main.rs

@@ -9,6 +9,7 @@ mod includes;
 mod index;
 mod init;
 mod markdown;
+mod playground;
 
 mod prelude {
     pub use crate::book_test::BookTest;

tests/testsuite/playground.rs

@@ -0,0 +1,18 @@
+//! Tests for Rust playground support.
+
+use crate::prelude::*;
+
+// Verifies that a rust codeblock gets the playground class.
+#[test]
+fn playground_on_rust_code() {
+    BookTest::from_dir("playground/playground_on_rust_code").check_main_file(
+        "book/index.html",
+        str![[r##"
+<h1 id="rust-sample"><a class="header" href="#rust-sample">Rust Sample</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>
+"##]],
+    );
+}

tests/testsuite/playground/playground_on_rust_code/book.toml

@@ -0,0 +1,2 @@
+[book]
+title = "playground_on_rust_code"

tests/testsuite/playground/playground_on_rust_code/src/SUMMARY.md

@@ -0,0 +1,3 @@
+# Summary
+
+- [Rust Playground](./index.md)

tests/testsuite/playground/playground_on_rust_code/src/index.md

@@ -0,0 +1,5 @@
+# Rust Sample
+
+```rust
+let x = 1;
+```