Test migration to jest by hand

Apparently using regular expressions is way easier.

test/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;

test/isSorted/isSorted.test.js

@@ -0,0 +1,20 @@
+const expect = require('expect');
+const isSorted = require('./isSorted.js');
+
+
+  test('isSorted is a Function', () => {
+  expect(isSorted).toBeInstanceOf(Function);
+});
+  t.equal(isSorted([0, 1, 2]), 1, 'Array is sorted in ascending order');
+  t.equal(isSorted([0, 1, 2, 2]), 1, 'Array is sorted in ascending order');
+  t.equal(isSorted([-4, -3, -2]), 1, 'Array is sorted in ascending order');
+  t.equal(isSorted([0, 0, 1, 2]), 1, 'Array is sorted in ascending order');
+  t.equal(isSorted([2, 1, 0]), -1, 'Array is sorted in descending order');
+  t.equal(isSorted([2, 2, 1, 0]), -1, 'Array is sorted in descending order');
+  t.equal(isSorted([-2, -3, -4]), -1, 'Array is sorted in descending order');
+  t.equal(isSorted([2, 1, 0, 0]), -1, 'Array is sorted in descending order');
+  t.equal(isSorted([]), undefined, 'Array is empty');
+  t.equal(isSorted([1]), 0, 'Array is not sorted, direction changed in array');
+  t.equal(isSorted([1, 2, 1]), 0, 'Array is not sorted, direction changed in array');
+  
+