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;

test/pluralize/pluralize.test.js

@@ -0,0 +1,19 @@
+const expect = require('expect');
+const pluralize = require('./pluralize.js');
+
+
+  test('pluralize is a Function', () => {
+  expect(pluralize).toBeInstanceOf(Function);
+});
+  t.equal(pluralize(0, 'apple'), 'apples', 'Produces the plural of the word');
+  t.equal(pluralize(1, 'apple'), 'apple', 'Produces the singular of the word');
+  t.equal(pluralize(2, 'apple'), 'apples', 'Produces the plural of the word');
+  t.equal(pluralize(2, 'person', 'people'), 'people', 'Prodices the defined plural of the word');
+  const PLURALS = {
+    person: 'people',
+    radius: 'radii'
+  };
+  const autoPluralize = pluralize(PLURALS);
+  t.equal(autoPluralize(2, 'person'), 'people', 'Works with a dictionary');
+  
+