Add comprehensive tests for role middleware and fix package dependencies

node_modules/@sinonjs/samsam/lib/is-iterable.js

@@ -0,0 +1,18 @@
+"use strict";
+
+/**
+ * Returns `true` when the argument is an iterable, `false` otherwise
+ *
+ * @alias module:samsam.isIterable
+ * @param  {*}  val - A value to examine
+ * @returns {boolean} Returns `true` when the argument is an iterable, `false` otherwise
+ */
+function isIterable(val) {
+    // checks for null and undefined
+    if (typeof val !== "object") {
+        return false;
+    }
+    return typeof val[Symbol.iterator] === "function";
+}
+
+module.exports = isIterable;