Adding tests with jest

test/utils/keys.test.js

@@ -0,0 +1,14 @@
+import Keys from '../../src/js/utils/keys';
+
+test('Keys are present', () => {
+  expect(Keys.ENTER).toBe(13);
+  expect(Keys.SPACE).toBe(32);
+  expect(Keys.RE_PAGE).toBe(33);
+  expect(Keys.AV_PAGE).toBe(34);
+  expect(Keys.END).toBe(35);
+  expect(Keys.HOME).toBe(36);
+  expect(Keys.LEFT).toBe(37);
+  expect(Keys.UP).toBe(38);
+  expect(Keys.RIGHT).toBe(39);
+  expect(Keys.DOWN).toBe(40);
+});