JUnit is a unit testing framework for the Java programming language. JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks which is collectively known as xUnit that originated with SUnit.<\/p>\n
JUnit 4 has been updated, and on the latest version supports annotations for the testing methods. Annotations are a big change from JUnit 3 to JUnit 4, and compared to the previous version, JUnit 4 has also introduced This example will help us understand the JUnit Annotations and will explain their basic use and basic meaning.\n<\/p>\n Before we code our example, let’s take a look at the following table. This table describes the JUnit Annotations and gives an overview of the most important available annotations, showing their meaning and use.<\/p>\n Here we have our basic Java Class that we need to test. We are going to use a simple example regarding Account balances. Account.java<\/span><\/em><\/p>\n Here we have our test case for the AccountTest.java<\/span><\/em><\/p>\n Here is the output of our test case. As we can see, the sequence of the executed test methods, complies with what we descibed in the annotations table.This JUnit test is fully passed.[ulp id=’ODQaBEw1BIbHApZq’]<\/p>\n This was an example of JUnit Annotations.<\/p>\n@BeforeClass<\/code> and @AfterClass<\/code>methods which have to be declared as static methods.<\/p>\n1. Junit Annotations<\/h2>\n
\n\n
\n @Test<\/strong>
\npublic void method() <\/code><\/td>\nThe Test annotation indicates that the public void method to which it is attached can be run as a test case.<\/td>\n<\/tr>\n \n @Before<\/strong>
\npublic void method() <\/code><\/td>\nThe Before annotation indicates that this method must be executed before each test in the class, so as to execute some preconditions necessary for the test.<\/td>\n<\/tr>\n \n @BeforeClass<\/strong>
\npublic static void method() <\/code><\/td>\nThe BeforeClass annotation indicates that the static method to which is attached must be executed once and before all tests in the class. That happens when the test methods share computationally expensive setup (e.g. connect to database).<\/td>\n<\/tr>\n \n @After<\/strong>
\npublic void method() <\/code><\/td>\nThe After annotation indicates that this method gets executed after execution of each test (e.g. reset some variables after execution of every test, delete temporary variables etc)<\/td>\n<\/tr>\n \n @AfterClass<\/strong>
\npublic static void method() <\/code><\/td>\nThe AfterClass annotation can be used when a method needs to be executed after executing all the tests in a JUnit Test Case class so as to clean-up the expensive set-up (e.g disconnect from a database). Attention: The method attached with this annotation (similar to BeforeClass) must be defined as static.<\/td>\n<\/tr>\n \n @Ignores<\/strong>
\npublic static void method() <\/code><\/td>\nThe Ignore annotation can be used when you want temporarily disable the execution of a specific test. Every method that is annotated with @Ignore<\/code> won\u2019t be executed.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n2. Basic Java Class to be tested<\/h2>\n
package com.javacodegeeks.core.junit;\n\npublic class Account {\n\tprivate double balance;\n\n\tpublic Account(double balance) {\n\t\tthis.balance = balance;\n\t}\n\n\tpublic double getBalance() {\n\t\treturn balance;\n\t}\n\n\tpublic void setBalance(double balance) {\n\t\tthis.balance = balance;\n\t}\n\n\tpublic void withdraw(double withdrawAmount) {\n\t\tthis.balance = balance - withdrawAmount;\n\t}\n\n\tpublic void deposit(double depositAmount) {\n\t\tthis.balance = balance + depositAmount;\n\t}\n}<\/pre>\n3. Test Case<\/h2>\n
Account.class<\/code> Java Class.This test class includes all the basic annotations mentioned above.<\/p>\npackage com.javacodegeeks.core.junit;\nimport org.junit.*;\n\npublic class AccountTest extends Assert {\n\tprivate Account account;\n\tprivate static double balance;\n\n\t@BeforeClass\n\tpublic static void BeforeClass() {\n\t\tbalance = 100;\n\t\tSystem.out.println(\"BeforeClass\");\n\t}\n\n\t@Before\n\tpublic void setUp() throws Exception {\n\t\taccount = new Account(balance);\n\t}\n\n\t@Test\n\tpublic void balanceForAccount() {\n\t\tAssert.assertEquals(\"Test balance\", account.getBalance(), balance, 0);\n\t\tSystem.out.println(\"Test balance. Balance: \" + account.getBalance());\n\t}\n\n\t@Test\n\tpublic void testOneDeposit() {\n\t\taccount.deposit(20);\n\t\tAssert.assertEquals(\"Test deposit\", account.getBalance(), balance, 20);\n\t\tSystem.out.println(\"Test deposit. Balance: \" + account.getBalance());\n\t}\n\n\t@Test\n\tpublic void testManyDeposits() {\n\t\taccount.deposit(20);\n\t\taccount.deposit(10);\n\t\tAssert.assertEquals(\"Test many deposits\", account.getBalance(), balance, 30);\n\t\tSystem.out.println(\"Test many deposits. Balance: \" + account.getBalance());\n\t}\n\n\t@Test\n\tpublic void testOneWithdraw() {\n\t\taccount.withdraw(20);\n\t\tAssert.assertEquals(\"Test withdraw\", account.getBalance(), balance, 20);\n\t\tSystem.out.println(\"Test withdraw. Balance: \" + account.getBalance());\n\t}\n\n\t@Test\n\tpublic void testManyWithdraws() {\n\t\taccount.withdraw(20);\n\t\taccount.withdraw(10);\n\t\tAssert.assertEquals(\"Test many withdraws\", account.getBalance(), balance, 30);\n\t\tSystem.out.println(\"Test many withdraws. Balance: \" + account.getBalance());\n\t}\n\n\t@After\n\tpublic void tearDown() throws Exception {\n\t\taccount = null;\n\t\tSystem.out.println(\"tearDown\");\n\t}\n\n\t@AfterClass\n\tpublic static void AfterClass() {\n\t\tbalance = 0;\n\t\tSystem.out.println(\"AfterClass\");\n\t}\n\n\t@Ignore\n\tpublic void executionIgnored() {\n\t\tSystem.out.println(\"@Ignore: This execution is ignored\");\n\t}\n}<\/pre>\n4. Run the Test Case<\/h2>\n
BeforeClass\nTest balance. Balance: 100.0\ntearDown\nTest deposit. Balance: 120.0\ntearDown\nTest many deposits. Balance: 130.0\ntearDown\nTest withdraw. Balance: 80.0\ntearDown\nTest many withdraws. Balance: 70.0\ntearDown\nAfterClass<\/pre>\n
Download the example<\/h2>\n