The most important package in JUnit is junit.framework, which contains all the core classes. Some of the important classes are as follows −
Let's use some of the above-mentioned methods in an example. Create a java class file named TestJunit1.java in C:\>JUNIT_WORKSPACE.
Let's use some of the above-mentioned methods in an example. Create a java class file named TestJunit2.java in C:\>JUNIT_WORKSPACE.
Create a java class file named TestJunit3.java in C:\>JUNIT_WORKSPACE.
Create a java class file named JunitTestSuite.java in C:\>JUNIT_WORKSPACE to create Test suite.
Sr.No. | Class Name | Functionality |
---|---|---|
1 | Assert | A set of assert methods. |
2 | TestCase | A test case defines the fixture to run multiple tests. |
3 | TestResult | A TestResult collects the results of executing a test case. |
4 | TestSuite | A TestSuite is a composite of tests. |
Assert Class
Following is the declaration for org.junit.Assert class −public class Assert extends java.lang.ObjectThis class provides a set of assertion methods useful for writing tests. Only failed assertions are recorded. Some of the important methods of Assert class are as follows −
Sr.No. | Methods & Description |
---|---|
1 | void assertEquals(boolean expected, boolean actual) Checks that two primitives/objects are equal. |
2 | void assertFalse(boolean condition) Checks that a condition is false. |
3 | void assertNotNull(Object object) Checks that an object isn't null. |
4 | void assertNull(Object object) Checks that an object is null. |
5 | void assertTrue(boolean condition) Checks that a condition is true. |
6 | void fail() Fails a test with no message. |
import org.junit.Test; import static org.junit.Assert.*; public class TestJunit1 { @Test public void testAdd() { //test data int num = 5; String temp = null; String str = "Junit is working fine"; //check for equality assertEquals("Junit is working fine", str); //check for false condition assertFalse(num > 6); //check for not null value assertNotNull(str); } }Next, create a java class file named TestRunner1.java in C:\>JUNIT_WORKSPACE to execute test case(s).
import org.junit.runner.JUnitCore; import org.junit.runner.Result; import org.junit.runner.notification.Failure; public class TestRunner1 { public static void main(String[] args) { Result result = JUnitCore.runClasses(TestJunit1.class); for (Failure failure : result.getFailures()) { System.out.println(failure.toString()); } System.out.println(result.wasSuccessful()); } }Compile the test case and Test Runner classes using javac.
C:\JUNIT_WORKSPACE>javac TestJunit1.java TestRunner1.javaNow run the Test Runner, which will run the test case defined in the provided Test Case class.
C:\JUNIT_WORKSPACE>java TestRunner1Verify the output.
true
TestCase Class
Following is the declaration for org.junit.TestCase class −public abstract class TestCase extends Assert implements TestA test case defines the fixture to run multiple tests. Some of the important methods of TestCase class are as follows −
Sr.No. | Methods & Description |
---|---|
1 | int countTestCases() Counts the number of test cases executed by run(TestResult result). |
2 | TestResult createResult() Creates a default TestResult object. |
3 | String getName() Gets the name of a TestCase. |
4 | TestResult run() A convenience method to run this test, collecting the results with a default TestResult object. |
5 | void run(TestResult result) Runs the test case and collects the results in TestResult. |
6 | void setName(String name) Sets the name of a TestCase. |
7 | void setUp() Sets up the fixture, for example, open a network connection. |
8 | void tearDown() Tears down the fixture, for example, close a network connection. |
9 | String toString() Returns a string representation of the test case. |
import junit.framework.TestCase; import org.junit.Before; import org.junit.Test; public class TestJunit2 extends TestCase { protected double fValue1; protected double fValue2; @Before public void setUp() { fValue1 = 2.0; fValue2 = 3.0; } @Test public void testAdd() { //count the number of test cases System.out.println("No of Test Case = "+ this.countTestCases()); //test getName String name = this.getName(); System.out.println("Test Case Name = "+ name); //test setName this.setName("testNewAdd"); String newName = this.getName(); System.out.println("Updated Test Case Name = "+ newName); } //tearDown used to close the connection or clean up activities public void tearDown( ) { } }Next, create a java class file named TestRunner2.java in C:\>JUNIT_WORKSPACE to execute test case(s).
import org.junit.runner.JUnitCore; import org.junit.runner.Result; import org.junit.runner.notification.Failure; public class TestRunner2 { public static void main(String[] args) { Result result = JUnitCore.runClasses(TestJunit2.class); for (Failure failure : result.getFailures()) { System.out.println(failure.toString()); } System.out.println(result.wasSuccessful()); } }Compile the test case and Test Runner classes using javac.
C:\JUNIT_WORKSPACE>javac TestJunit2.java TestRunner2.javaNow run the Test Runner, which will run the test case defined in the provided Test Case class.
C:\JUNIT_WORKSPACE>java TestRunner2Verify the output.
No of Test Case = 1 Test Case Name = testAdd Updated Test Case Name = testNewAdd true
TestResult Class
Following is the declaration for org.junit.TestResult class −public class TestResult extends ObjectA TestResult collects the results of executing a test case. It is an instance of the Collecting Parameter pattern. The test framework distinguishes between failures and errors. A failure is anticipated and checked for with assertions. Errors are unanticipated problems like an ArrayIndexOutOfBoundsException. Some of the important methods of TestResult class are as follows −
Sr.No. | Methods & Description |
---|---|
1 | void addError(Test test, Throwable t) Adds an error to the list of errors. |
2 | void addFailure(Test test, AssertionFailedError t) Adds a failure to the list of failures. |
3 | void endTest(Test test) Informs the result that a test was completed. |
4 | int errorCount() Gets the number of detected errors. |
5 | Enumeration<TestFailure> errors() Returns an Enumeration for the errors. |
6 | int failureCount() Gets the number of detected failures. |
7 | void run(TestCase test) Runs a TestCase. |
8 | int int runCount() Gets the number of run tests. |
9 | void startTest(Test test) Informs the result that a test will be started. |
10 | void stop() Marks that the test run should stop. |
import org.junit.Test; import junit.framework.AssertionFailedError; import junit.framework.TestResult; public class TestJunit3 extends TestResult { // add the error public synchronized void addError(Test test, Throwable t) { super.addError((junit.framework.Test) test, t); } // add the failure public synchronized void addFailure(Test test, AssertionFailedError t) { super.addFailure((junit.framework.Test) test, t); } @Test public void testAdd() { // add any test } // Marks that the test run should stop. public synchronized void stop() { //stop the test here } }Next, create a java class file named TestRunner3.java in C:\>JUNIT_WORKSPACE to execute test case(s).
import org.junit.runner.JUnitCore; import org.junit.runner.Result; import org.junit.runner.notification.Failure; public class TestRunner3 { public static void main(String[] args) { Result result = JUnitCore.runClasses(TestJunit3.class); for (Failure failure : result.getFailures()) { System.out.println(failure.toString()); } System.out.println(result.wasSuccessful()); } }Compile the test case and Test Runner classes using javac.
C:\JUNIT_WORKSPACE>javac TestJunit3.java TestRunner3.javaNow run the Test Runner, which will run the test case defined in the provided Test Case class.
C:\JUNIT_WORKSPACE>java TestRunner3Verify the output.
true
TestSuite Class
Following is the declaration for org.junit.TestSuite class:public class TestSuite extends Object implements TestA TestSuite is a Composite of tests. It runs a collection of test cases. Some of the important methods of TestSuite class are as follows −
Sr.No. | Methods & Description |
---|---|
1 | void addTest(Test test) Adds a test to the suite. |
2 | void addTestSuite(Class<? extends TestCase> testClass) Adds the tests from the given class to the suite. |
3 | int countTestCases() Counts the number of test cases that will be run by this test. |
4 | String getName() Returns the name of the suite. |
5 | void run(TestResult result) Runs the tests and collects their result in a TestResult. |
6 | void setName(String name) Sets the name of the suite. |
7 | Test testAt(int index) Returns the test at the given index. |
8 | int testCount() Returns the number of tests in this suite. |
9 | static Test warning(String message) Returns a test which will fail and log a warning message. |
import junit.framework.*; public class JunitTestSuite { public static void main(String[] a) { // add the test's in the suite TestSuite suite = new TestSuite(TestJunit1.class, TestJunit2.class, TestJunit3.class ); TestResult result = new TestResult(); suite.run(result); System.out.println("Number of test cases = " + result.runCount()); } }Compile the Test suite classes using javac.
C:\JUNIT_WORKSPACE>javac JunitTestSuite.javaNow run the Test Suite.
C:\JUNIT_WORKSPACE>java JunitTestSuiteVerify the output.
No of Test Case = 1 Test Case Name = testAdd Updated Test Case Name = testNewAdd Number of test cases = 3
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