(For objects, it uses the equals method to compare them.) The first of the two values is considered to be the result that you expect the second is the actual result produced by the class under test.ĪssertNotEquals(' message', value1, value2)Ĭauses this test method to fail if the given two values are equal to each other.

JUnit provides the following assertion methods:Ĭauses this test method to fail if the given boolean test is not true.Ĭauses this test method to fail if the given boolean test is not false.ĪssertEquals(' message', expectedValue, value)Ĭauses this test method to fail if the given two values are not equal to each other. You use assertions to state things that you expect to always be true, such as assertEquals(3, list.size()) if you expect the array list to contain exactly 3 elements at that point in the code. If all assertions' conditions in the test method are true, the test method passes. If the condition is false, the test method fails. JUnit testing methods utilize assertions, which are statements that check whether a given condition is true or false. Each testing method should be short and should test only one specific aspect of the class under test. Another test might check to make sure that the list's size is correct after various manipulations. In the Package Explorer area on the left side of the Eclipse window, right-click the class you want to test and click New → JUnit Test Case.Įach unit test method in your JUnit test case file should test a particular small aspect of the behavior of the 'class under test.' For example, an ArrayIntListTest might have one testing method to see whether elements can be added to the list and then retrieved. java file in your project that will test one of your existing classes.

Here is a direct link to download the latest JUnit v4.8.2 JAR file. JUnit is distributed as a 'JAR' which is a compressed archive containing Java. Or if you aren't using Eclipse, JUnit can be downloaded for free from the JUnit web site at. JUnit isn't part of the standard Java class libraries, but it does come included with Eclipse. A unit test generally consists of various testing methods that each interact with the class under test in some specific way to make sure it works as expected. Unit testing is the process of examining a small 'unit' of software (usually a single class) to verify that it meets its expectations or specification.Ī unit test targets some other 'class under test ' for example, the class ArrayIntListTest might be targeting the ArrayIntList as its class under test. JUnit is a Java library to help you perform unit testing.

Junit jar download for eclipse