diff --git a/sample_files/new.jsx b/sample_files/new.jsx
new file mode 100644
index 000000000..6530a6929
--- /dev/null
+++ b/sample_files/new.jsx
@@ -0,0 +1,6 @@
+ReactDOM.render(
+  <h1 className="title">
+      <span>Hello</span>, world!
+  </h1>,
+  document.getElementById("root")
+);
diff --git a/sample_files/old.jsx b/sample_files/old.jsx
new file mode 100644
index 000000000..dddd8d03d
--- /dev/null
+++ b/sample_files/old.jsx
@@ -0,0 +1,3 @@
+ReactDOM.render(
+  <h1>Hello, world!</h1>,
+  document.getElementById("root"));