Migrated tests to jest

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

test4/isPrimitive/isPrimitive.js

@@ -0,0 +1,2 @@
+const isPrimitive = val => !['object', 'function'].includes(typeof val) || val === null;
+module.exports = isPrimitive;

test4/isPrimitive/isPrimitive.test.js

@@ -0,0 +1,23 @@
+const expect = require('expect');
+const isPrimitive = require('./isPrimitive.js');
+
+test('Testing isPrimitive', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof isPrimitive === 'function').toBeTruthy();
+  expect(isPrimitive(null)).toBeTruthy();
+  expect(isPrimitive(undefined)).toBeTruthy();
+  expect(isPrimitive('string')).toBeTruthy();
+  expect(isPrimitive(true)).toBeTruthy();
+  expect(isPrimitive(50)).toBeTruthy();
+  expect(isPrimitive('Hello')).toBeTruthy();
+  expect(isPrimitive(false)).toBeTruthy();
+  expect(isPrimitive(Symbol())).toBeTruthy();
+  expect(isPrimitive([1, 2, 3])).toBeFalsy();
+  expect(isPrimitive({ a: 123 })).toBeFalsy();
+
+  let start = new Date().getTime();
+  isPrimitive({ a: 123 });
+  let end = new Date().getTime();
+  expect((end - start) < 2000).toBeTruthy();
+});