Migrated tests to jest

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

test4/isSorted/isSorted.js

@@ -0,0 +1,9 @@
+const isSorted = arr => {
+let direction = -(arr[0] - arr[1]);
+for (let [i, val] of arr.entries()) {
+direction = !direction ? -(arr[i - 1] - arr[i]) : direction;
+if (i === arr.length - 1) return !direction ? 0 : direction;
+else if ((val - arr[i + 1]) * direction > 0) return 0;
+}
+};
+module.exports = isSorted;

test4/isSorted/isSorted.test.js

@@ -0,0 +1,20 @@
+const expect = require('expect');
+const isSorted = require('./isSorted.js');
+
+test('Testing isSorted', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof isSorted === 'function').toBeTruthy();
+  //t.deepEqual(isSorted(args..), 'Expected');
+  expect(isSorted([0, 1, 2])).toBe(1);
+  expect(isSorted([0, 1, 2, 2])).toBe(1);
+  expect(isSorted([-4, -3, -2])).toBe(1);
+  expect(isSorted([0, 0, 1, 2])).toBe(1);
+  expect(isSorted([2, 1, 0])).toBe(-1);
+  expect(isSorted([2, 2, 1, 0])).toBe(-1);
+  expect(isSorted([-2, -3, -4])).toBe(-1);
+  expect(isSorted([2, 1, 0, 0])).toBe(-1);
+  expect(isSorted([])).toBe(undefined);
+  expect(isSorted([1])).toBe(0);
+  expect(isSorted([1, 2, 1])).toBe(0);
+});