add tests

src/config.rs

@@ -815,6 +815,22 @@ mod tests {
         assert_eq!(got.html_config().unwrap(), html_should_be);
     }
 
+    #[test]
+    fn disable_runnable() {
+        let src = r#"
+        [book]
+        title = "Some Book"
+        description = "book book book"
+        authors = ["Shogo Takata"]
+
+        [output.html.playground]
+        runnable = false
+        "#;
+
+        let got = Config::from_str(src).unwrap();
+        assert_eq!(got.html_config().unwrap().playground.runnable, false);
+    }
+
     #[test]
     fn edition_2015() {
         let src = r#"

tests/rendered_output.rs

@@ -17,6 +17,7 @@ use std::ffi::OsStr;
 use std::fs;
 use std::io::Write;
 use std::path::{Component, Path, PathBuf};
+use std::str::FromStr;
 use tempfile::Builder as TempFileBuilder;
 use walkdir::{DirEntry, WalkDir};
 
@@ -150,6 +151,25 @@ fn rendered_code_has_playground_stuff() {
     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();
+    let config = Config::from_str(
+        "
+    [output.html.playground]
+    runnable = false
+    ",
+    )
+    .unwrap();
+    let md = MDBook::load_with_config(temp.path(), config).unwrap();
+    md.build().unwrap();
+
+    let nested = temp.path().join("book/first/nested.html");
+    let playground_class = vec![r#"class="playground""#];
+
+    assert_doesnt_contain_strings(nested, &playground_class);
+}
+
 #[test]
 fn anchors_include_text_between_but_not_anchor_comments() {
     let temp = DummyBook::new().build().unwrap();