added unit testing, and started implementing unit tests...phew

node_modules/p-is-promise/index.js

@@ -0,0 +1,14 @@
+'use strict';
+
+const isPromise = input => (
+	input instanceof Promise ||
+	(
+		input !== null &&
+		typeof input === 'object' &&
+		typeof input.then === 'function' &&
+		typeof input.catch === 'function'
+	)
+);
+
+module.exports = isPromise;
+module.exports.default = isPromise;