Test directory up-to-date

test/kmphToMph.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {kmphToMph} = require('./_30s.js');
+
+test('kmphToMph is a Function', () => {
+  expect(kmphToMph).toBeInstanceOf(Function);
+});
+test('Returns mph from kph.', () => {
+  expect(kmphToMph(10)).toBe(6.21371192);
+});