generate new test that did already exist & update all module snippets with declaration

test/runPromisesInSeries/runPromisesInSeries.js

@@ -1 +1 @@
-module.exports = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());
+module.exports = runPromisesInSeries = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());