Learn to unit test C/C++ applications using the CPPUnit unit testing framework. Designing software with unit testing in mind may yield better software – the programmer is forced to isolate components. Easy refactoring of code. The unit test is. CppUnit is a unit testing framework module for the C++ programming language. It allows unit-testing of C sources as well as C++ with minimal source.

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Our testing unit should be coded with another module, that is: All these frameworks apply similar rules, and probably you can use one if you’ve used another one, with few language-dependent exceptions. Our test case should test these two operations, with two Test Cases: Each time we find an error for instance, if we detect that the internal data isn’t the same as the external correct datawe should raise a concrete exception. The way you create this auxiliary file isn’t important, but it is very important that this file is correctly created and the DATA structure must be correctly stored.

These two Test Cases build a Test Suitethat is: A programmer is testing his or her code by using the debugger. Once we know what aspects we should test, we must be able to program it.

Click here for a larger image. Tutorkal This Week All-Time. And finally, we define an attribute called fixture. Here are some cppunkt macros:. Assertions are macros that let us check a condition, and they raise the proper exception if the condition is false, with other options. For instance, if we improve our “addition” module to add decimal numbers, we have to change our tests, adding, for example, a new addDecimalNumbersTest Test Case.

If you want to read more about the unit testing basis, you can check the JUnit Web tutoriak. Each test compares the addition result with expected value, and it returns FALSE if the result is a value that is different than the expected one.


They called them JUnit and it became a great hit in the unit testing world. As we’re coding in plain C, this module is represented by a C function:.

CppUnit: C++ unit test framework

As we can see, we’ve configured a DATA structure with known data and stored it using our fixture object. NET platformand many others. We’re going to follow the next algorithm: If at least one unit doesn’t pass all its tests, we’ve found a bug. There is another way to check a condition and raise an exception if it’s false, all in a single step. Gates Bill What are u tallking about?

CppUnit – The Unit Testing Library

For the first one, lets us derive our new class from the TestCase base class. For instance, we’ve written a small module that stores some data on a disk. This module coded as a class called DiskData has two main responsibilities: Thanks for your registration, follow us on our social networks to xppunit up-to-date.

I’m going to consider that you know what unit testing is, and why it is very important in the software development process. Protected methods implement our test logic, one for each Test Case. Implementation is titorial simple for now: Each Test Case should be coded inside a class derived from TestCase. There have been no articles posted today.

By coding “unit tests” before its development, you’re getting this set of knowledge, and, when you code the main unit, you’ll be able to develop faster and better than the other way.

Unit Testing with CPPUnit

First of all, we must include TestCase. This small module or function is called Test Caseand it shows a set of checks we do over a single unit. With this tool, you can check each variable value in every program at any time.

Every verification must be related to a single unit scenario. Sometimes, we’ll need external helps such as an auxiliary file or database table that stores correct data.


Once all binaries are built, you can write your own Test Suites. In that case, we must code another test, even add a new Test Case if necessary, checking all conditions to reproduce this bug. Both files should be identical because the store method must generate the same file structure.

tutkrial Let’s see this example: By running step by step, you can verify whether a variable has the expected value. Let’s take a look:. You can get latest CPPUnit version herewhere you can find all libraries, documentation, examples, and other interesting stuff.

We can perform all operations we need: We’re going to test our DiskData class, which mainly performs two operations: A few programmers can keep their mind in a deep, hard, and long debugging process and, after one or two hours, the programmer’s brain is near break down.

Each time a team wants to deploy a new release, it should perform a complete unit tests battery. Other developers ported their code to other languages, building cplunit big collection of products, called xUnit frameworks. Cpppunit can write other Test Cases, for checking others scenarios.

Then, the Test Case code will be executed using our fixture object, and finally we destroy this object inside tearDown, after each Test Case execution. For now, it isn’t important how these methods are coded because the most important thing is that we must be sure this class is doing all the things it must do, that is: In the next few lines, I’ll explain how you can code your test logic.

How would setting up tests for the dll differ from the approach presented in this article?