Added playpen and mdbook init tests

tests/integration_tests.rs

@@ -128,6 +128,38 @@ fn check_correct_cross_links_in_nested_dir() {
     }
 }
 
+#[test]
+fn run_mdbook_init() {
+    let created_files = vec!["book", "src", "src/SUMMARY.md", "src/chapter_1.md"];
+
+    let temp = TempDir::new("mdbook").unwrap();
+    for file in &created_files {
+        assert!(!temp.path().join(file).exists());
+    }
+
+    let mut md = MDBook::new(temp.path());
+    md.init().unwrap();
+
+    for file in &created_files {
+        assert!(temp.path().join(file).exists(), "{} doesn't exist", file);
+    }
+}
+
+#[test]
+fn rendered_code_has_playpen_stuff() {
+    let temp = create_book(true);
+    let mut md = MDBook::new(temp.path());
+    md.build().unwrap();
+
+    let nested = temp.path().join("book/first/nested.html");
+    let playpen_class = vec![r#"class="playpen""#];
+
+    assert_contains_strings(nested, &playpen_class);
+
+    let book_js = temp.path().join("book/book.js");
+    assert_contains_strings(book_js, &[".playpen"]);
+}
+
 /// Create a dummy book in a temporary directory, using the contents of
 /// `SUMMARY_MD` as a guide.
 ///