To contribute to this FAQ, simply write a JUnit-related. About. JUnit 5 is the next generation of JUnit. The goal is to create an. This small example shows you how to write a unit test. Create a new folder junit-example and download the current from JUnit’s release page and Hamcrest to this folder. The Java compiler creates a file

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Jump into JUnit 4

No tests found in XXX” when I run my test? Compiling the test source with debug enabled will show the line where the assertion failed. Using a test fixture avoids duplicating the code necessary to initialize and cleanup the common objects. For that reason, don’t test getX ; there is no benefit.

JUnit already provides several useful rule implementations. It executes each test within a separate instance of the test class.

It is true that adding tests for even these simple methods guards against the possibility that someone refactors and makes the methods “not-so-simple” anymore. Look to dicumentation the design so that it’s easier to test, and by doing so a better design will usually emerge. If you are using JDK 1.


This is called a Test class. Parameters in [] brackets are optional and of type String. Listing 2 shows the same test seen in Listing 1 but redefined dkcumentation annotations:. Do I need to write a test class for every class I need to test? To define your own converter you have to implement the ArgumentConverter interface.

The test would resemble an expected user interaction with the application.

Assert (JUnit API)

You also saw how a test run looks in Eclipse and learned a simple workaround that allows you to run your tests in any version of Ant, even those prior to 1.

JUnit 4 has added a new assert method for comparing array contents.

In fact, here is the current version in CVS, which demonstrates how to add exclusions to the list too:. Documentation and examples are at https: Wikipedia maintains a list of available xUnit testing frameworks. It allows to read information about the test via reflection.

The new major version of the programmer-friendly testing framework for Java

You can specify more than one fixture for a test case in JUnit 4. Then install JUnit on your platform of choice: Under what conditions should I not test get and set methods? This gives a xocumentation what should happen if the test method is executed. You can find a complete example of a working maven configuration here: If that is done correctly, reading the actual implementation can be avoided.


When you want to check a value, import org.

This logic, doocumentation example, could be initializing a class that you will test in multiple test cases or even logic to populate a database before you run a data-dependent test.

Checks that both variables refer to the same object. To learn more about mock frameworks please see the Mockito tutorial. All these annotations can be used on methods. In that case, test myCollaboratorand not the current class. An assertion method compares the actual value returned by a test to the expected value.

How do I run JUnit using Ant?