Add sinon package for mocking

node_modules/@sinonjs/samsam/lib/is-neg-zero.js

@@ -0,0 +1,14 @@
+"use strict";
+
+/**
+ * Returns `true` when `value` is `-0`
+ *
+ * @alias module:samsam.isNegZero
+ * @param {*} value A value to examine
+ * @returns {boolean} Returns `true` when `value` is `-0`
+ */
+function isNegZero(value) {
+    return value === 0 && 1 / value === -Infinity;
+}
+
+module.exports = isNegZero;