CODEWITHSUNDEEP
javaseleniumjunittestng
Ceyhun Ganioğlu
Ceyhun Ganioğlu

Reputation: 63

TestNG @BeforeClass initialization code not running before Test

I am writing test codes with Selenium, TestNG. I am trying to set some elements on the @BeforeClass section as I am repeating those actions on the same page. But I am getting null pointer exception. Is there a way to fix this issue?

public class RunTest {
private static WebElement user;
private static WebElement pass;
private static WebElement login;

@BeforeClass
public static void driveraBaglan() {
    //Driver is declared here. I removed it to give the simple code. 
    user = driver.findElement(By.id("user"));
    pass = driver.findElement(By.id("pass"));
    login = driver.findElement(By.xpath("//button[contains(.,'Log In')]"));
    statusMessage = driver.findElement(By.id("login-status-message")).getText();

}
@Test(priority=1)
public void loginNoInfo() {
        user.clear();
        pass.clear();
}

I get the null pointer error on user.clear() , pass.clear() and login.click() functions. All tests on the page runs on the same page. I don't want to use repeated "find element by id" tags on each test on the page.

Upvotes: 2

Views: 6512

Answers (4)

Parker H Gordon
Parker H Gordon

Reputation: 89

For me I had to include alwaysRun = true, which implies that it was probably a misconfiguration of the groups somehow.

@BeforeClass(alwaysRun = true)
setup() { ... }

Upvotes: 0

Gimhani
Gimhani

Reputation: 1375

I got this same issue by an accidental change I've done.

You may also get the null pointer exception on objects you are initializing in @BeforeClass or @BeforeTest, when you have a dilemma situation as below (where the class is set to as a disabled test class while having enabled test methods).

@Test(enabled=false)
public class TestClass{
    A a;    

    @BeforeClass
    public void doBeforeClass(){
      a=new A();
      //
    }

    @Test
    public void test1(){
       a.callMethod1();
    }

    @Test
    public void test2(){
       a.callMethod2();
    }

}

Here, when you are running full-suite by putting @Test(enabled=false) only for the class, still the suite will run individual tests in the class since @Test annotations are present there. However, since @BeforeClass is not running for whole class, object 'a' is not initialized and will cause null pointer exceptions.

In such cases, the individual @Test annotations too need to be changed to @Test(enabled=false)

Upvotes: 1

Davide Patti
Davide Patti

Reputation: 3461

I never used TestNG but I do use Junit. Trying to replicate your example, I obtained the following exception:

[TestNG] Running:
  /Users/davide.patti/Library/Caches/IntelliJIdea2017.3/temp-testng-customsuite.xml

java.lang.NullPointerException
    at TestSO.loginNoInfo(TestSO.java:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
    at org.testng.SuiteRunner.run(SuiteRunner.java:240)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1198)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
    at org.testng.TestNG.run(TestNG.java:1031)
    at org.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:72)
    at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:123)

The reason was because, in my imported classes I was using the BeforeClass of Junit:

import org.junit.BeforeClass;
import org.testng.annotations.Test;

and not of TestNG.

If your null pointer exception is the same, be sure that your imported classes are the correct ones:

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

Upvotes: 1

Roushan
Roushan

Reputation: 4420

@BeforeTest: The annotated method will be run before any test method belonging to the classes inside the <test> tag is run.
@BeforeClass: The annotated method will be run before the first test method in the current class is invoked

try to change the annotation 

@BeforeTest
public static void driveraBaglan() {
    //Driver is declared here. I removed it to give the simple code. 
    user = driver.findElement(By.id("user"));
    pass = driver.findElement(By.id("pass"));
    login = driver.findElement(By.xpath("//button[contains(.,'Log In')]"));
    statusMessage = driver.findElement(By.id("login-status-message")).getText();

}

Upvotes: 2

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