Test migration to jest by hand

Apparently using regular expressions is way easier.

test/pluralize/pluralize.js

@@ -0,0 +1,7 @@
+const pluralize = (val, word, plural = word + 's') => {
+const _pluralize = (num, word, plural = word + 's') =>
+[1, -1].includes(Number(num)) ? word : plural;
+if (typeof val === 'object') return (num, word) => _pluralize(num, word, val[word]);
+return _pluralize(val, word, plural);
+};
+module.exports = pluralize;