null values passed when passing ITestContext attribute value to onTestStart method

I want to pass the variables that I set using ITestContext to onTestStart

   public void login(ITestContext Test){
        Test.setAttribute("nodeName","05 test");
        Test.setAttribute("nodeDetails","05 This belongs to regresion test");
   }

I used below code but only null values get printed.

 @Override
    public void onTestStart(ITestResult result) {
        //get the node name
        String node= (String) result.getTestContext().getAttribute("nodeName");
        String nodeDetails= (String) result.getTestContext().getAttribute("nodeDetails");
        System.out.println("onTestStart node is "+node);
        System.out.println("onTestStart nodeDetails is* "+nodeDetails);
}

However, I did notice that when I put it to onTestSuccess method.

My original requirement is to pass the node name and node details for extent's report node creation in onTestStart method. Kindly help.

test = report.createTest(result.getMethod().getMethodName()).createNode(node).pass(nodeDetails);

onStart: This method is invoked before any test method gets executed. You can use this to set your extra attributes if you need to.

onTestStart: This method is invoked before any tests method is invoked. This can be used to indicate that the particular test method has been started.

   @Override
   public void onStart(ITestContext context) {

        context.setAttribute("nodeName","05 test");
        context.setAttribute("nodeDetails","05 This belongs to regresion test");
   }

=== Edited

If you want to add some attributes to the ITestContext before (ALL Tests are run), then use @BeforeTest

Use @BeforeTest, this will be run once before all other tests are run.

   @BeforeTest
   public void setData(ITestContext context)
   {
      context.setAttribute("nodeName","05 test");
   }

If you want to do some logic that is supposed to run before (EACH) test method, then use

@BeforeMethod
public void beforeMethod(ItestContext testContext) {
    // Do testContext related processing
}

If neither of the above, and you want to pass custom data to each @Test case, then DataProvider is what you are looking for.

An example:

    @DataProvider(name = "node-05-provider")
    public Object[][] dataProvider(){
            return new Object[][]{
                {"node-05"}};
    }

    @Test(dataProvider="node-05-provider")
    public void search(String data){
     
         System.out.println(data); // "node-05"


    }