Updated the test system

test/uncurry.test.js

@@ -0,0 +1,19 @@
+const expect = require('expect');
+const {uncurry} = require('./_30s.js');
+
+test('uncurry is a Function', () => {
+  expect(uncurry).toBeInstanceOf(Function);
+});
+const add = x => y => z => x + y + z;
+const add1 = uncurry(add);
+const add2 = uncurry(add, 2);
+const add3 = uncurry(add, 3);
+test('Works without a provided value for n', () => {
+  expect(add1(1)(2)(3)).toBe(6);
+});
+test('Works with n = 2', () => {
+  expect(add2(1, 2)(3)).toBe(6);
+});
+test('Works with n = 3', () => {
+  expect(add3(1, 2, 3)).toBe(6);
+});