Contents
Welcome.......................................................................................................................................................................... 3
What is Test-Driven Development (TDD)?..........................................................................................................4
The Tools.......................................................................................................................................................................... 5
Installing Ceedling.......................................................................................................................................................6
Creating a New Ceedling Project...........................................................................................................................7
Example #1: Starting TDD with Ceedling............................................................................................................9
Create a Module...................................................................................................................................................... 9
Implement a Feature...........................................................................................................................................11
Repeat....................................................................................................................................................................... 13
Refactoring.............................................................................................................................................................. 15
Mocking Hardware Interfaces...............................................................................................................................17
Example #2: Mocking a Hardware Interface with CMock..........................................................................19
Create the Temperature Sensor Module.....................................................................................................19
Write Our First Test..............................................................................................................................................19
Create the Function Under Test......................................................................................................................21
Mock the I2C Interface.......................................................................................................................................21
Implement the Function Under Test.............................................................................................................22
Adding Another Test...........................................................................................................................................22
Example #3: Add Unit Tests to Your Current Project with Ceedling......................................................24
Start with an Existing Project...........................................................................................................................25
Install and Configure Ceedling.......................................................................................................................26
Create a New Test File........................................................................................................................................29
Getting it to Build.................................................................................................................................................29
Adding More Source Folders...........................................................................................................................30
Mocking Hardware Drivers from the Header Files..................................................................................31
CMock Won't Do Paths to Header Files......................................................................................................32
Including Other Header Files in Our Mocks..............................................................................................33
Enabling Mocks for Extern-ed Function Prototypes...............................................................................34
Add an Actual Unit Test.....................................................................................................................................36
The Next Steps......................................................................................................................................................37
References.................................................................................................................................................................... 39
Source Code...........................................................................................................................................................39
Documentation..................................................................................................................................................... 39
Ceedling Quick Reference......................................................................................................................................40
Test Assertions.......................................................................................................................................................40
Mock Function Formats.....................................................................................................................................41
How to Use Ceedling for Embedded Test-Driven Development 2
