JUnit is a Regression Testing Framework used by developers to
implement unit testing in Java, and accelerate programming speed and
increase the quality of code. JUnit Framework can be easily integrated
with either of the following −
- Eclipse
- Ant
- Maven
Features of JUnit Test Framework
JUnit test framework provides the following important features −- Fixtures
- Test suites
- Test runners
- JUnit classes
Fixtures
Fixtures is a fixed state of a set of objects used as a baseline for running tests. The purpose of a test fixture is to ensure that there is a well-known and fixed environment in which tests are run so that results are repeatable. It includes −- setUp() method, which runs before every test invocation.
- tearDown() method, which runs after every test method.
import junit.framework.*; public class JavaTest extends TestCase { protected int value1, value2; // assigning the values protected void setUp(){ value1 = 3; value2 = 3; } // test method to add two values public void testAdd(){ double result = value1 + value2; assertTrue(result == 6); } }
Test Suites
A test suite bundles a few unit test cases and runs them together. In JUnit, both @RunWith and @Suite annotation are used to run the suite test. Given below is an example that uses TestJunit1 & TestJunit2 test classes.import org.junit.runner.RunWith; import org.junit.runners.Suite; //JUnit Suite Test @RunWith(Suite.class) @Suite.SuiteClasses({ TestJunit1.class ,TestJunit2.class }) public class JunitTestSuite { }
import org.junit.Test; import org.junit.Ignore; import static org.junit.Assert.assertEquals; public class TestJunit1 { String message = "Robert"; MessageUtil messageUtil = new MessageUtil(message); @Test public void testPrintMessage() { System.out.println("Inside testPrintMessage()"); assertEquals(message, messageUtil.printMessage()); } }
import org.junit.Test; import org.junit.Ignore; import static org.junit.Assert.assertEquals; public class TestJunit2 { String message = "Robert"; MessageUtil messageUtil = new MessageUtil(message); @Test public void testSalutationMessage() { System.out.println("Inside testSalutationMessage()"); message = "Hi!" + "Robert"; assertEquals(message,messageUtil.salutationMessage()); } }
Test Runners
Test runner is used for executing the test cases. Here is an example that assumes the test class TestJunit already exists.import org.junit.runner.JUnitCore; import org.junit.runner.Result; import org.junit.runner.notification.Failure; public class TestRunner { public static void main(String[] args) { Result result = JUnitCore.runClasses(TestJunit.class); for (Failure failure : result.getFailures()) { System.out.println(failure.toString()); } System.out.println(result.wasSuccessful()); } }
JUnit Classes
JUnit classes are important classes, used in writing and testing JUnits. Some of the important classes are −- Assert − Contains a set of assert methods.
- TestCase − Contains a test case that defines the fixture to run multiple tests.
- TestResult − Contains methods to collect the results of executing a test case.
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