Migrated tests to jest

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

test4/isValidJSON/isValidJSON.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const isValidJSON = require('./isValidJSON.js');
+
+test('Testing isValidJSON', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof isValidJSON === 'function').toBeTruthy();
+  expect(isValidJSON('{"name":"Adam","age":20}')).toBe(true);
+  expect(isValidJSON('{"name":"Adam",age:"20"}')).toBe(false);
+  expect(isValidJSON(null)).toBe(true);
+});