Test migration to jest by hand

Apparently using regular expressions is way easier.

test/findLastIndex/findLastIndex.js

@@ -0,0 +1,6 @@
+const findLastIndex = (arr, fn) =>
+arr
+.map((val, i) => [i, val])
+.filter(([i, val]) => fn(val, i, arr))
+.pop()[0];
+module.exports = findLastIndex;

test/findLastIndex/findLastIndex.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const findLastIndex = require('./findLastIndex.js');
+
+
+  test('findLastIndex is a Function', () => {
+  expect(findLastIndex).toBeInstanceOf(Function);
+});
+  t.equal(findLastIndex([1, 2, 3, 4], n => n % 2 === 1), 2, 'Finds last index for which the given function returns true');
+  
+