Solution

src/ifElse.test.js

@@ -1,11 +1,35 @@
 'use strict';
 
 describe('ifElse', () => {
-  // const { ifElse } = require('./ifElse');
+  const { ifElse } = require('./ifElse');
 
-  it('should ', () => {
+  it(`shouldn't return anything`, () => {
+    const condition = () => true;
+    const first = () => true;
+    const second = () => true;
 
+    expect(ifElse(condition, first, second)).toBeUndefined();
   });
 
-  // write tests here
+  it(`should call first if condition is true`, () => {
+    let result = 0;
+    const condition = () => true;
+    const first = () => (result = 1);
+    const second = () => (result = 2);
+
+    ifElse(condition, first, second);
+
+    expect(result).toBe(1);
+  });
+
+  it(`should call second if condition is false`, () => {
+    let result = 0;
+    const condition = () => false;
+    const first = () => (result = 1);
+    const second = () => (result = 2);
+
+    ifElse(condition, first, second);
+
+    expect(result).toBe(2);
+  });
 });