Functional Testing of Hybrid Apps Tutorial

1. Introduction

This tutorial aims to provide you with a comprehensive guide to functional testing of hybrid apps. The focus will be on how to effectively test your app against functional requirements and specifications to ensure it works as expected.

By the end of this tutorial, you should be able to:

• Understand the basics of functional testing
• Perform functional testing on hybrid apps
• Analyze and interpret test results

Prerequisites: Basic knowledge of programming and app development is recommended.

2. Step-by-Step Guide

Functional testing is a quality assurance process aimed at verifying the application's ability to function as expected. For hybrid apps, which work on multiple platforms, functional testing is even more critical.

Concept: Functional Testing

Functional testing involves the following steps:

1. Identifying functions that the app should perform
2. Creating input data based on function's specifications
3. Determining the output based on function's specifications
4. Executing the test case
5. Comparing actual and expected outputs

Best Practices

1. Write detailed test cases: Describe what you are testing, the approach, and the expected results.
2. Prioritize testing based on user interaction: Start testing with the most used features.

3. Code Examples

Below are some practical examples of functional tests using the popular testing framework Mocha and Chai for assertion.

Example 1: Testing Login Functionality

// import necessary libraries
const chai = require('chai');
const expect = chai.expect;

// describe the test suite
describe('Login Functionality', function() {

  // describe the test case
  it('should log in with valid credentials', function() {

    // define input and expected output
    let input = {username: 'test', password: 'test123'};
    let expectedOutput = 'Login Successful';

    // call the function with input
    let actualOutput = app.login(input);

    // compare actual and expected outputs
    expect(actualOutput).to.equal(expectedOutput);
  });
});

In this example, we've defined a test case under the 'Login Functionality' suite. We're testing if the login functionality works with valid credentials.

4. Summary

This tutorial covered the basics of functional testing, how to create, execute, and interpret functional test results. It also provided best practices to keep in mind when writing and performing such tests.

Next, you can learn about other types of testing like integration testing, system testing, etc.

5. Practice Exercises

1. Exercise 1: Write a functional test for a 'Sign Up' feature of an app.
2. Exercise 2: Write a functional test for 'Forgot Password' functionality.

Solution

// Exercise 1
describe('Sign Up Functionality', function() {
  it('should sign up with valid details', function() {
    let input = {username: 'newUser', password: 'newPassword'};
    let expectedOutput = 'Sign Up Successful';
    let actualOutput = app.signUp(input);
    expect(actualOutput).to.equal(expectedOutput);
  });
});

// Exercise 2
describe('Forgot Password Functionality', function() {
  it('should send a reset link for valid email', function() {
    let input = 'test@example.com';
    let expectedOutput = 'Reset Link Sent';
    let actualOutput = app.forgotPassword(input);
    expect(actualOutput).to.equal(expectedOutput);
  });
});

Keep practicing and creating new test cases for different functionalities. With time, you'll improve your ability to write and understand functional tests.