Test migration to jest by hand

Apparently using regular expressions is way easier.

test/reduceSuccessive/reduceSuccessive.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const reduceSuccessive = require('./reduceSuccessive.js');
+
+
+  test('reduceSuccessive is a Function', () => {
+  expect(reduceSuccessive).toBeInstanceOf(Function);
+});
+  t.deepEqual(reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0), [0, 1, 3, 6, 10, 15, 21], 'Returns the array of successively reduced values');
+  
+