Test migration to jest by hand

Apparently using regular expressions is way easier.

test/intersectionWith/intersectionWith.js

@@ -0,0 +1,2 @@
+const intersectionWith = (a, b, comp) => a.filter(x => b.findIndex(y => comp(x, y)) !== -1);
+module.exports = intersectionWith;

test/intersectionWith/intersectionWith.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const intersectionWith = require('./intersectionWith.js');
+
+
+  test('intersectionWith is a Function', () => {
+  expect(intersectionWith).toBeInstanceOf(Function);
+});
+  t.deepEqual(intersectionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)), [1.5, 3, 0], 'Returns a list of elements that exist in both arrays, using a provided comparator function');
+  
+