Migrated tests to jest

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

test/isEven/isEven.test.js

@@ -1,13 +0,0 @@
-const test = require('tape');
-const isEven = require('./isEven.js');
-
-test('Testing isEven', (t) => {
-  //For more information on all the methods supported by tape
-  //Please go to https://github.com/substack/tape
-  t.true(typeof isEven === 'function', 'isEven is a Function');
-  t.equal(isEven(4), true, '4 is even number');
-  t.false(isEven(5), false, '5 is not an even number');
-  //t.deepEqual(isEven(args..), 'Expected');
-  //t.throws(isEven(args..), 'Expected');
-  t.end();
-});