Introduction to Testing in Go (Golang)

12h 17m 47s
English
Paid
June 7, 2024

Writing unit tests and integration tests is one of the most-neglected aspects of software development. All too often, a developer will find him or herself say "but it works on my computer!" when a project is presumed finished, only to discover that once taken out of the development environment, things don't work as expected. Well written unit tests and integration tests help to solve this problem, and in fact almost without exception will reduce overall development time, rather than adding to it.

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In addition, well-tested code almost always requires less maintenance, and the end product will have less down time.

This course is focused on writing unit and integration tests in Go, a modern, type safe, compiled, and extremely fast programming language. It it is ideally suited for building safe, scalable, incredibly fast web applications, and it has powerful testing tools built right in.

In this course, we will build four simple applications, and thoroughly test them:

  • A command line application (CLI) that tries to determine if a user-entered number is prime or not;

  • A simple web application that allows a user to log in and upload a profile picture;

  • A simple REST API built on the same code base as the web application which allows users to authenticate using JWT tokens and perform operations against a Postgres database. We'll go through the entire authentication process, including using refresh tokens, and thoroughly test all aspects of the code.

  • A simple Single Page Web Application (SPA), written in Vanilla JavaScript, that demonstrates how to use JWT and Refresh Tokens with a SPA, and how to test that functionality.

For each of these projects, we will learn how to write unit tests for all functionality. We will learn how to test (among other things):

  • Application routes

  • Application handlers

  • How to test multiple scenarios by writing and using table tests

  • Database operations (using the Repository pattern)

  • Application middleware

  • User authentication (with sessions)

  • User authentication (with JWT tokens)

  • JWT token generation and validation

  • Refresh token generation and validation

  • Testing user input

  • Writing to the terminal

  • Adding cookies to a request

  • Reading cookies from a response

By the end of this course, you will have a solid understanding of how to write effective tests, and how to write testable code.

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# Title Duration
1 Introduction 05:34
2 About me 01:02
3 Asking for help 01:15
4 Mistakes: we all make them. 01:07
5 What we'll cover in this section 00:30
6 Installing Go 01:28
7 Installing an IDE 01:30
8 Installing Docker 00:52
9 What we'll cover in this section 01:04
10 Creating a simple command line application 06:21
11 Writing a test for the isPrime() function 07:58
12 Improving our test with table tests 07:21
13 Checking test coverage 02:30
14 Completing our table tests 02:49
15 Improving our program to allow for user entered information 11:26
16 Writing a test for the prompt() function 07:10
17 Writing a test for the intro() function 02:30
18 Testing user input - writing a test for the checkNumbers() function 13:36
19 Updating readUserInput to make it testable, and then testing it 05:58
20 What we'll cover in this section 00:45
21 Running a single test 01:38
22 Running groups of tests (test suites) 02:00
23 What we'll cover in this section 00:43
24 Creating a simple web app 10:16
25 Setting up a route and handler for the home page 12:00
26 Testing our application routes 11:29
27 Testing Handlers: the Home handler 10:01
28 Setting up some simple middleware 12:23
29 Trying out our new addIPToContext middleware 02:46
30 Testing our middleware 12:12
31 Testing ipFromContext 04:30
32 Creating a login form 02:57
33 Setting up a route and stub handler for the login form 04:44
34 What we'll cover in this section 00:35
35 Setting up validation logic 09:33
36 Testing validation logic 08:25
37 Completing the tests for our validation logic 05:19
38 Trying out validation with our login form 03:27
39 What we'll cover in this section 00:56
40 Setting up a test enviroment with testing.M 04:29
41 Simplifying our templates using a layout 04:26
42 Installing a sessions package 02:02
43 Adding session to App config, and creating a SessionManager 04:11
44 Trying out our sessions 07:39
45 Updating our tests 11:48
46 Improving our test for the Home handler 06:19
47 Testing the render function with a bad template 07:37
48 What we'll cover in this section 01:14
49 Installing postgres with Docker 06:06
50 Setting up a database connection 10:27
51 Adding the data package for models and db package for database access 04:03
52 Making sure our web app can connect to our database 03:35
53 Closing our database pool gracefully, and resetting template path in tests 01:58
54 Creating a stub profile page 08:29
55 Adding messages to our template data and template files 06:54
56 Adding true authenication to the Login handler 05:33
57 Testing the Login handler 19:18
58 Adding Auth middleware 04:25
59 Testing Auth middleware 06:54
60 Updating routes & end-to-end tests 09:29
61 Problems with our Login handler test 01:57
62 What we'll cover in this section 02:13
63 Defining an interface type for our repository 03:28
64 Moving our database functions into a repository 05:02
65 Updating application config to use the database repository 02:21
66 Creating a testdb repository 05:50
67 Updating setup_test.go to use the test repository 01:59
68 Updating our tests to use the testdb repository 04:33
69 What we'll cover in this section 01:23
70 Getting started with testing our database 08:06
71 Getting our tests to spin up a docker image with Postgres 11:04
72 Populating our test database with empty tables 08:55
73 Testing InsertUser 06:22
74 Testing AllUsers 04:10
75 Testing GetUser and GetUserByEmail 05:12
76 Testing UpdateUser 04:22
77 Testing DeleteUser 02:34
78 Testing ResetUserPassword 04:14
79 Testing InsertUserImage 06:36
80 Using build tags to separate our integration tests 02:56
81 What we'll cover in this section 00:57
82 Adding a form to the Profile page 05:44
83 Adding the UserImage type to the User type 05:42
84 Updating the profile.page.gohtml file to look for a profile image 06:53
85 Writing a stub handler and a function to process profile image uploads 14:29
86 Implementing the UploadProfilePic handler 04:51
87 Trying things out 04:29
88 Testing image uploads 15:22
89 Testing our upload handler, with an alternative approach 09:52
90 What we'll cover in this section 01:30
91 Setting up an api with our existing code base 09:55
92 Adding stub handlers (endpoints) for our API 05:49
93 Trying out our REST API to make sure things work 05:23
94 Getting started with JWT Authentication 19:04
95 Generating token pairs 10:39
96 Implementing the authenticate handler 04:50
97 Trying out the authentication handler 04:53
98 Testing our authentication handler 10:51
99 Setting up a simple program to generate tokens for testing 02:39
100 Testing generating and validating tokens 15:38
101 Setting up our application middleware 06:40
102 Testing our CORS middleware 07:04
103 Testing our authRequired middleware 08:18
104 Add middleware to routes 02:16
105 Testing API routes 03:56
106 Implementing the handler to refresh tokens 09:41
107 Testing refreshing tokens 13:13
108 Completing the handlers that interact with the User type 07:22
109 Testing the handlers that interact with the User type 11:56
110 Finishing up testing handlers that interact with the data.User type 08:55
111 What we'll cover in this section 01:21
112 Serving HTML for our SPA 05:18
113 Authenticating users with our SPA 16:16
114 Setting a refresh token cookie when authenticating 08:40
115 Allowing users to refresh tokens using a cookie 06:24
116 Automatically refreshing tokens while the user is logged in 05:54
117 Getting a user from our simple SPA with the "Get User" button 04:37
118 Logging web users out 06:01
119 Testing refreshing tokens for Single Page Apps 08:59
120 Testing logging users out of our SPA 06:33

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