Migrated tests to jest

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

test3/is/is.js

@@ -0,0 +1,2 @@
+const is = (type, val) => ![, null].includes(val) && val.constructor === type;
+module.exports = is;

test3/is/is.test.js

@@ -0,0 +1,24 @@
+const expect = require('expect');
+const is = require('./is.js');
+
+test('Testing is', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof is === 'function').toBeTruthy();
+  expect(is(Array, [1])).toBeTruthy();
+  expect(is(Array, [])).toBeTruthy();
+  expect(is(Array, {})).toBeFalsy();
+  expect(is(Object, {})).toBeTruthy();
+  expect(is(Map, new Map())).toBeTruthy();
+  expect(is(RegExp, /./g)).toBeTruthy();
+  expect(is(Set, new Set())).toBeTruthy();
+  expect(is(WeakMap, new WeakMap())).toBeTruthy();
+  expect(is(WeakSet, new WeakSet())).toBeTruthy();
+  expect(is(String, '')).toBeTruthy();
+  expect(is(String, new String(''))).toBeTruthy();
+  expect(is(Number, 1)).toBeTruthy();
+  expect(is(Number, new Number('10'))).toBeTruthy();
+  expect(is(Boolean, false)).toBeTruthy();
+  expect(is(Boolean, new Boolean(false))).toBeTruthy();
+  expect(is(Function, () => null)).toBeTruthy();
+});