So siehts ganz gut aus !

node_modules/es5-ext/test/function/#/to-string-tokens.js

@@ -0,0 +1,33 @@
+/* eslint no-eval: "off" */
+
+"use strict";
+
+module.exports = function (t, a) {
+	a.deep(
+		t.call(function (a, b) {
+			return this[a] + this[b];
+		}),
+		{ args: "a, b", body: "\n\t\t\treturn this[a] + this[b];\n\t\t" }
+	);
+	a.deep(t.call(function () {}), { args: "", body: "" });
+	// eslint-disable-next-line no-unused-vars
+	a.deep(t.call(function (raz) {}), { args: "raz", body: "" });
+	a.deep(
+		t.call(function () {
+			Object();
+		}),
+		{ args: "", body: "\n\t\t\tObject();\n\t\t" }
+	);
+
+	try {
+		eval("(() => {})");
+	} catch (e) {
+		// Non ES2015 env
+		return;
+	}
+
+	a.deep(t.call(eval("(() => {})")), { args: "", body: "" });
+	a.deep(t.call(eval("((elo) => foo)")), { args: "elo", body: "foo" });
+	a.deep(t.call(eval("(elo => foo)")), { args: "elo", body: "foo" });
+	a.deep(t.call(eval("((elo, bar) => foo())")), { args: "elo, bar", body: "foo()" });
+};