Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test3/initialize2DArray/initialize2DArray.js

@@ -0,0 +1,3 @@
+const initialize2DArray = (w, h, val = null) =>
+Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));
+module.exports = initialize2DArray;

test3/initialize2DArray/initialize2DArray.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const initialize2DArray = require('./initialize2DArray.js');
+
+test('Testing initialize2DArray', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof initialize2DArray === 'function').toBeTruthy();
+  expect(initialize2DArray(2, 2, 0)).toEqual([[0,0], [0,0]]);
+});