Test directory up-to-date

test/mphToKmph.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {mphToKmph} = require('./_30s.js');
+
+test('mphToKmph is a Function', () => {
+  expect(mphToKmph).toBeInstanceOf(Function);
+});
+test('Returns kph from mph.', () => {
+  expect(mphToKmph(10)).toBe(16.09344000614692);
+});