Test migration to jest by hand

Apparently using regular expressions is way easier.

test/toSnakeCase/toSnakeCase.js

@@ -0,0 +1,7 @@
+const toSnakeCase = str =>
+str &&
+str
+.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
+.map(x => x.toLowerCase())
+.join('_');
+module.exports = toSnakeCase;