![]() The After annotation indicates that this method gets executed after execution of each test (e.g. That happens when the test methods share computationally expensive setup (e.g. ![]() The BeforeClass annotation indicates that the static method to which is attached must be executed once and before all tests in the class. The Before annotation indicates that this method must be executed before each test in the class, so as to execute some preconditions necessary for the static void method() The Test annotation indicates that the public void method to which it is attached can be run as a test void method() The table below presents a summary of those annotations: void method() In this section we will mention the basic annotations supported in Junit 4. So that the integers to be tested are not equal, the output will be: Adding values: 2 + sum(): 7 = 10Īnd in the JUnit window, an error will appear and this message will be displayed: : expected: but was:Īt .testSum(CalculateTest.java:16) 2.2. Now, if we change this line of code: int testSum = 10 In this case where the test succeeds, the JUnit window does not show any errors or failures, as we can see in the image below:įigure 1: JUnit window after a successful test. To see the actual result of a JUnit test, Eclipse IDE provides a JUnit window which shows the results of the tests. If we run the test class, by right-clicking in the test class and select Run As -> Junit Test, the program output will look like that: Adding values: 2 + sum(): 7 = 7 The method assertEquals (, object expected, object actual) takes as inputs two objects and asserts that the two objects are equal. We can also observe a method called assertEquals(sum, testsum). Hence, the testSum() method is the method that will test the sum() public method. This annotation indicates that the public void method to which it is attached can be run as a test case. Firstly, we can see that there is a annotation above the testSum() method. Int testSum = void testSum() sum(): " + sum + " = " + testSum) Below, there is the code of the class named CalculateTest.java, which has the role of our test class:ĬalculateTest.java package The details of creating test cases will be presented in the next sections. Of course, if a method is very complex and extended, we can have more than one test methods for this complex method. For this purpose, we will create another class including methods that will test each one of the methods of the previous class (in this case, we have only one method to be tested). ![]() In the above source code, we can notice that the class has one public method named sum(), which gets as inputs two integers, adds them and returns the result. ("Adding values: " + var1 + " + " + var2) First we will present the class we would like to test:Ĭalculate.java package In this section we will see a simple JUnit example. part of an object – a method or some interacting methods.Test suites for easily organizing and running tests.Test features for sharing common test data.Assertions for testing expected results.JUnit is widely used in industry and can be used as stand alone Java program (from the command line) or within an IDE such as Eclipse. JUnit is an open source testing framework which is used to write and run repeatable automated tests, so that we can be ensured that our code works as expected. Another popular testing framework in Java is TestNG. As this guide is focused to JUnit, more details for this testing framework will presented in the next sections. The most popular testing framework in Java is JUnit. In any case, you should write tests for complex or critical parts of your code. Some developers believe that the code should have 100% test coverage, while others are comprised with a test coverage of 50% or less. In general, the development community has different opinion regarding the percentage of code that should be tested (test coverage). Also, unit testing can be used so as to ensure that the code will work as expected in case of future changes. This practice helps developers to discover failures in their logic behind their code and improve the quality of their code. For example, we can test whether an output is what we expected to see given some inputs or if a condition is true or false. So, the term unit testing refers to the practice of testing such small units of your code, so as to ensure that they work as expected. What is unit testing?Ī unit can be a function, a class, a package, or a subsystem. JUnit complete example using Eclipse 3.1. Test coverage 1.3.Unit testing in Java 2.
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