CF

The Complete Next.js Testing Course

8h 12m 48s
English
Paid

Master production-level testing in Next.js with this comprehensive course, bridging the gap to a senior developer level with ease.

Why Testing is Essential

Many developers deploy projects with fingers crossed. However, only a select few implement robust testing practices that catch critical bugs pre-production. This course is your gateway into this elite group of developers.

Discover why merely writing a few unit tests isn't enough, how to build a solid testing strategy, and the limitations of relying solely on coverage percentages like 80-90%. Testing is not just a task; it's a cohesive system.

Course Structure

The course follows a structured approach, divided into three core stages to enhance your learning experience:

Stage 1: Deep Understanding of Testing

Gain insights into establishing a test architecture, designing robust and scalable test systems, and fostering a fearless approach to refactoring.

Stage 2: Testing a Real Production Application

Work with a comprehensive application similar to StackOverflow, covering authentication, server-side logic, database interactions, API communications, AI integrations, and handling asynchronous processes, instead of simplistic examples.

Stage 3: Active Practical Assignments

Engage actively by writing tests for crucial scenarios, thereby reinforcing patterns used in a real production environment.

Tools and Technologies

Equip yourself with a cutting-edge testing stack suited for 2025 and beyond. The course covers:

  • Jest
  • React Testing Library
  • Playwright
  • Artillery
  • CI/CD using GitHub Actions and CircleCI

Prerequisites

This course is tailored for developers with a solid grasp of JavaScript and foundational experience with React and Next.js. Testing experience is not a prerequisite—you'll learn it comprehensively through practical, real-world scenarios.

Course Outcome

Upon completion, you'll have the confidence to test complex Next.js applications effectively, preemptively catching bugs and meeting the expectations of mid-to-senior-level developers.

Additional

https://github.com/adrianhajdin/jsmasterypro_devflow

About the Authors

Adrian Hajdin

Adrian Hajdin thumbnail

Adrian Hajdin is a Croatian developer and the founder of JavaScript Mastery, behind one of the larger React-and-Next.js tutorial YouTube channels. His personal-brand course material on CourseFlix sits alongside the JS Mastery catalog — both publishing long-form project-based React / Next.js builds.

The course catalog covers Next.js (including App Router, server components, server actions), React, TypeScript, Tailwind CSS, NextAuth / Clerk authentication, Prisma + PostgreSQL, Stripe billing, real-time features, the AI-feature integration patterns, and the deployment workflow with Vercel. Each course typically builds a complete working application end-to-end.

The CourseFlix listing under this source carries 8 Adrian Hajdin courses spanning that range. Material is paid and aimed at intermediate React developers building portfolio-quality projects.

JavaScript Mastery

JavaScript Mastery thumbnail

JavaScript Mastery (jsmastery.pro) is the paid course platform of Adrian Hajdin, a Croatian developer behind one of the larger React-and-Next.js tutorial channels on YouTube. The channel and platform's distinctive contribution is long-form project-based clones — Netflix-style streaming app, Airbnb clone, Zoom clone — built end-to-end using the modern Next.js / React stack.

The course catalog covers Next.js (including App Router and server components), React, TypeScript, Tailwind CSS, Stripe billing, NextAuth / Clerk authentication, MongoDB / Prisma, React Native, and the AI-feature integration that has become a standard part of modern web applications. Material is paid extended versions of the YouTube content with additional features and depth.

The CourseFlix listing under this source carries 9 JavaScript Mastery courses spanning that range. Material is paid; the platform runs on per-course or membership pricing on the original platform. Courses are aimed at intermediate React developers building portfolio-quality projects.

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#1: 001 Welcome to the Course
All Course Lessons (82)
#Lesson TitleDurationAccess
1
001 Welcome to the Course Demo
02:20
2
002 Prerequisites
01:43
3
003 Introduction to Testing
01:46
4
004 Meet Adrian, Your Instructor
01:51
5
005 Access to a Private 24-7 Community
01:19
6
006 Environment Setup
02:54
7
007 Introduction to Types of Testing
03:01
8
008 Testing by Scope
00:39
9
009 Testing by Scope
02:03
10
010 Testing by Scope
01:20
11
011 Testing by Scope
02:00
12
012 Testing by Scope
02:10
13
013 Testing by Knowledge
00:25
14
014 Testing by Knowledge
02:11
15
015 Testing by Knowledge
02:06
16
016 Testing by Knowledge
01:18
17
017 Testing by Purpose
00:48
18
018 Testing by Purpose
02:39
19
019 Testing by Purpose
02:39
20
020 Testing by Execution
00:33
21
021 Testing by Execution
02:02
22
022 Testing by Execution
02:26
23
023 Introduction to Testing Strategies
01:58
24
024 The Testing Pyramid
04:37
25
025 The Ice Cream Cone Anti-Pattern
02:44
26
026 The Testing Trophy
03:30
27
027 The Honeycomb Strategy
04:37
28
028 The Testing Diamond
04:01
29
029 Choose The Right Testing Strategy
04:31
30
030 Building and Evolving Your Testing Strategy
03:59
31
031 Git & GitHub
07:57
32
032 IDE — Integrated Development Environment
02:56
33
033 Node.js
04:27
34
034 Docker
03:24
35
035 Introduction to Testing Tools
02:45
36
036 Unit Testing Tools
03:51
37
037 Frontend Testing Tools
04:15
38
038 API and Backend Testing Tools
12:02
39
039 End-to-End Testing Tools
04:55
40
040 Common Misunderstandings
03:47
41
041 Introduction to Unit Testing
01:42
42
042 Setting Up the Testing Environment
10:50
43
043 Testing the Input Field Component
14:48
44
044 Testing the Image Upload Component
18:02
45
045 Testing the Text Area Component
15:21
46
046 Testing Social Fields Component
10:17
47
047 Testing the Profile Preview Component
06:14
48
048 Introduction to Integration Testing
03:26
49
049 Next.js Testing Setup with Vitest
03:28
50
050 MSW Setup: Mocking APIs for Integration Tests
13:09
51
051 Fetching Pokémon Test-Driven Server Action
09:46
52
052 Pokémon Type Fetching Test-Driven Server Action
11:51
53
053 Introduction to DevOverflow
06:34
54
054 Running DevOverflow Locally
18:05
55
055 Setup Testing Environment
09:40
56
056 Code Architecture
05:53
57
057 Your First Test in DevOverflow
08:44
58
058 Form Rendering
14:47
59
059 Form Validation
07:59
60
060 Form Submission
07:33
61
061 Scalable Mock Implementation
07:18
62
062 bmjldneh
03:52
63
063 Form Success
03:43
64
064 Question Form
01:55
65
065 Mock Editor
06:07
66
066 Question Form Rendering
09:29
67
067 Question Submission
21:07
68
068 Mock Next Auth
07:58
69
069 Answer Form for Authenticated Users
15:07
70
070 Answer Form Submission
12:06
71
071 Mock Question Card Components
10:57
72
072 Question Card
12:19
73
073 Question Card Responsiveness
04:51
74
074 Introduction
00:56
75
075 Preparing to Run Server Side Tests
02:39
76
076 Database Setup
08:17
77
077 Jest Integration Setup
11:30
78
078 Server Action Validation
09:45
79
079 Server Action Logic
09:13
80
080 Server Action Query
02:54
81
081 Introduction
01:14
82
082 AI Generation
10:53
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Frequently asked questions

What is The Complete Next.js Testing Course about?
Master production-level testing in Next.js with this comprehensive course, bridging the gap to a senior developer level with ease. Why Testing is Essential Many developers deploy projects with fingers crossed. However, only a select few…
Who teaches this course?
It is taught by Adrian Hajdin, JavaScript Mastery. You can find more courses by these instructors on the corresponding source pages.
How long is the course?
It contains 82 lessons with a total runtime of 8 hours 12 minutes. Every lesson is available to watch online at your own pace.
Is it free to watch?
It is part of CourseFlix's premium catalog. A subscription unlocks the full video player; the course description, table of contents, and preview information are available to everyone.
Where can I watch it online?
The course is available to watch online on CourseFlix at https://courseflix.net/course/the-complete-next-js-testing-course. The page hosts every lesson with the integrated video player; no download is required.