TestNG - Basic Annotations - BeforeMethod

---

---

@BeforeMethod annotated method will be run before each test method i.e say there are three test methods (i.e test cases), then @BeforeMethod annotated method will be called thrice before each test method.

The following is a list of attributes supported by the @BeforeMethod annotation:

Create a Class

Create a java class to be tested, say, MessageUtil.java in /work/testng/src.

/*
* This class prints the given message on console.
*/

public class MessageUtil {

   private String message;

   //Constructor
   //@param message to be printed
   public MessageUtil(String message) {
      this.message = message;
   }

   // prints the message
   public String printMessage() {
      System.out.println(message);
      return message;
   }
}

Create Test Case Class

• Create a java test class, say, TestAnnotationBeforeMethod.java in /work/testng/src.

• Add a test method testMethod() to your test class.

• Add an Annotation @Test to method testMethod().

• Add a method beforeMethod to the test class with annotation @BeforeMethod.

• Implement the test condition and check the behaviour of @BeforeMethod annotation.

Following are the TestAnnotationBeforeMethod.java contents:

  import org.testng.Assert;
  import org.testng.annotations.Test;
  import org.testng.annotations.BeforeMethod;

  public class TestAnnotationBeforeMethod {
    @BeforeMethod
    public void beforeMethod(){
      System.out.println("executing beforeMethod before each method");
    }
    @Test
    public void testMethodOne(){
      Assert.assertEquals("Test method one", (new MessageUtil("executing testMethodOne method")).printMessage());
    }
    @Test
    public void testMethodTwo(){
      Assert.assertEquals("Test method two", (new MessageUtil("executing testMethodTwo method")).printMessage());
    }

  }

Create testng.xml

Next, let's create testng.xml file in /work/testng/src, to execute test case(s). This file captures your entire testing in XML. This file makes it easy to describe all your test suites and their parameters in one file, which you can check in your code repository or e-mail to coworkers. It also makes it easy to extract subsets of your tests or split several runtime configurations (e.g., testngdatabase.xml would run only tests that exercise your database).

  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
  <suite name="Suite">
    <test thread-count="5" name="Test">
      <classes>
        <class name="TestAnnotationBeforeMethod"/>
      </classes>
    </test> <!-- Test -->
  </suite> <!-- Suite -->

Compile the test case using javac.

/work/testng/src$ javac TestAnnotationBeforeMethod.java MessageUtil.java

Now, run the testng.xml, which will run the test case defined in <test> tag. As you can see the @BeforeMethod is called before all other test cases.

/work/testng/src$ java org.testng.TestNG testng.xml

Verify the output.

  executing beforeMethod before each method
  executing testMethodOne method
  executing beforeMethod before each method
  executing testMethodTwo method

  ===============================================
  Suite
  Total tests run: 2, Passes: 0, Failures: 2, Skips: 0
  ===============================================