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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System testing includes functionality, robustness and performance. CPPUnit uses object-oriented programming, so we’re going to work with concepts such as inheritance, encapsulation, and polymorphism. Once tests are registered and added to the runner, we can show the dialogs with the run method. These methods are called automatically, and are executed when each Test Case starts and ends, respectively. Now, we’re going to explain how you can use CPPUnit to write you own unit tests and improve your units’ quality.

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

In this way, we get a new, fresh object each cpphnit we execute a test case. Just define a “runner” instance, and add all registered tests. 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.

With this tool, you can check each variable value in every program at any time.

By coding “unit tests” before its development, you’re getting this set of knowledge, and, when you code the main unit, you’ll pcpunit able to develop faster and better than the other way. This is powerful, but pretty slow and it might have plenty of errors. Our test case should test these two operations, with two Test Cases: If unit passes the test, we consider the bug is resolved and we can release our new, bug-free version.


We should create this object inside the setUp method, which is called before each Test Case. These two Test Cases build a Test Suitethat is: We can write the code like this:.

This is simpler isn’t it?

Implementation is very simple for now: First of all, we must include TestCase. All cppunti repetitive and hard verifications can be done automatically, with a few programming instructions and proper tools.

Next, you can see test case methods, which we’re going to explain. Let’s see this example: Within a Quality Assurance process, we have mainly two kinds of tests:.

Unit Testing with CPPUnit

We made all kinds of verifications, such as buffers’ and files’ sizes or buffers’ contents. As we’re coding in plain C, tutoriap module is represented by a C function:.

Today This Week All-Time. If at least one unit doesn’t pass all its tests, we’ve found a bug. 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.

CppUnit: C++ unit test framework

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. You can get latest CPPUnit version herewhere you can find all libraries, documentation, examples, and other cppunlt stuff. NET platformand many others. We’re going to follow the next algorithm: This module coded as a class called DiskData has two main responsibilities: They called them JUnit and it became a great hit in the unit testing world.


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. The way to do this is through assertions.

By running step by step, you can verify whether a variable has the expected value. In the next few lines, I’ll explain how you can code your test logic. Then, we read the resulting file data. Extreme programming recommends you that you code all these unit tests before you code the target unit. The main reason is very simple: If you want to read more about the unit testing basis, you can check the JUnit Web site.

A programmer is testing his or her code by using the debugger. Just compile your new project and run it from Visual Studio. 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.

All units must pass their unit or acceptance tests, and in this case, we can release a successful new version. But when I tried to port an application on VC7 then all of a sudden the code crashes. These tools I’m going to speak about are called “unit testing frameworks.

This class brings us all basic functionality to run a test, register it inside a Test Suite, and so on. And finally, we define an attribute called fixture. Each time a team wants to deploy a new release, it should perform a complete unit tests battery.