Assertion
All the assertions are in the 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 assertTrue(boolean expected, boolean actual) Checks that a condition is true. |
3 | void assertFalse(boolean condition) Checks that a condition is false. |
4 | void assertNotNull(Object object) Checks that an object isn't null. |
5 | void assertNull(Object object) Checks that an object is null. |
6 | void assertSame(boolean condition) The assertSame() method tests if two object references point to the same object. |
7 | void assertNotSame(boolean condition) The assertNotSame() method tests if two object references do not point to the same object. |
8 | void assertArrayEquals(expectedArray, resultArray); The assertArrayEquals() method will test whether two arrays are equal to each other. |
import org.junit.Test; import static org.junit.Assert.*; public class TestAssertions { @Test public void testAssertions() { //test data String str1 = new String ("abc"); String str2 = new String ("abc"); String str3 = null; String str4 = "abc"; String str5 = "abc"; int val1 = 5; int val2 = 6; String[] expectedArray = {"one", "two", "three"}; String[] resultArray = {"one", "two", "three"}; //Check that two objects are equal assertEquals(str1, str2); //Check that a condition is true assertTrue (val1 < val2); //Check that a condition is false assertFalse(val1 > val2); //Check that an object isn't null assertNotNull(str1); //Check that an object is null assertNull(str3); //Check if two object references point to the same object assertSame(str4,str5); //Check if two object references not point to the same object assertNotSame(str1,str3); //Check whether two arrays are equal to each other. assertArrayEquals(expectedArray, resultArray); } }Next, create a java class file named TestRunner.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(TestAssertions.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 TestAssertions.java TestRunner.javaNow run the Test Runner, which will run the test case defined in the provided Test Case class.
C:\JUNIT_WORKSPACE>java TestRunnerVerify the output.
true
Annotation
Annotations are like meta-tags that you can add to your code, and apply them to methods or in class. These annotations in JUnit provide the following information about test methods −- which methods are going to run before and after test methods.
- which methods run before and after all the methods, and.
- which methods or classes will be ignored during the execution.
Sr.No. | Annotation & Description |
---|---|
1 | @Test The Test annotation tells JUnit that the public void method to which it is attached can be run as a test case. |
2 | @Before Several tests need similar objects created before they can run. Annotating a public void method with @Before causes that method to be run before each Test method. |
3 | @After If you allocate external resources in a Before method, you need to release them after the test runs. Annotating a public void method with @After causes that method to be run after the Test method. |
4 | @BeforeClass Annotating a public static void method with @BeforeClass causes it to be run once before any of the test methods in the class. |
5 | @AfterClass This will perform the method after all tests have finished. This can be used to perform clean-up activities. |
6 | @Ignore The Ignore annotation is used to ignore the test and that test will not be executed. |
import org.junit.After; import org.junit.AfterClass; import org.junit.Before; import org.junit.BeforeClass; import org.junit.Ignore; import org.junit.Test; public class JunitAnnotation { //execute before class @BeforeClass public static void beforeClass() { System.out.println("in before class"); } //execute after class @AfterClass public static void afterClass() { System.out.println("in after class"); } //execute before test @Before public void before() { System.out.println("in before"); } //execute after test @After public void after() { System.out.println("in after"); } //test case @Test public void test() { System.out.println("in test"); } //test case ignore and will not execute @Ignore public void ignoreTest() { System.out.println("in ignore test"); } }Next, create a java class file named TestRunner.java in C:\>JUNIT_WORKSPACE to execute annotations.
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(JunitAnnotation.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 JunitAnnotation.java TestRunner.javaNow run the Test Runner, which will run the test case defined in the provided Test Case class.
C:\JUNIT_WORKSPACE>java TestRunnerVerify the output.
in before class in before in test in after in after class true
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