Using DataProvider in TestNG

DataProvider in TestNG

TestNG supports two different ways of passing parameter values.

1. Parametrization through .xml file

2. DataProvider

• Parametrization through .xml file is one of the methods of passing parameter values. This method is useful if the data set is limited to just a few rows.
• To provide data from DataProvider we need to declare a method that returns the data set in the form of two dimensional object array Object[][].
• The first array represents a data set whereas the second array contains the parameter values.
• The DataProvider method can be in the same test class or one of its super classes.
• It is also possible to provide DataProvider in another class but then the method has to be static.

                                     Calling DataProvider from Same Class

package qa_simple_data_provider;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

public class Simple_Data_Provider {

    @Test(dataProvider = "ProvideData")
    public  void getData(int age, String name){
        System.out.println("Running DataProvider from Same class");
        System.out.println("Mr "+ name + " your age is "+ age);
    }

    @DataProvider
    public Object[][] ProvideData(){
        return new Object[][]{{24,"Adam"},{23,"Erwin"}};
    }
}

                                        Calling DataProvider from Other Class

//DataProvider Class    
package qa1;

import org.testng.annotations.DataProvider;


import org.testng.annotations.Test;

public class Simple_Data_Provider {

    @DataProvider
    public static Object[][] ProvideData(){
        return new Object[][]{{24,"Adam"},{23,"Erwin"}};
    }
}

// Method which will use DataProvider

package qa;

import org.testng.annotations.Test;

public class Get_Data_From_Other_Class {

    @Test(dataProvider = "ProvideData", dataProviderClass=qa1.Simple_Data_Provider.class)
    public void getData(int age, String name){
        System.out.println("Running Data Provider from other class");
        System.out.println("Mr "+ name + " your age is "+ age+ " on 02-Aug-2015");
    }
}

                                                   Sample Testng.xml file

<?xml version="1.0" encoding="UTF-8"?>
<suite name="StaticDataProviderExampleSuite" parallel="false">
  <test name="StaticDataProviderTest">
    <classes>
      <class name="qa.Get_Data_From_Other_Class"/>
    </classes>
  </test>
</suite>

While accessing the DataProvider method from other class we will make only 2 changes.

1. The DataProvider method should be declared as static.

2. The method in other class which will use the DataProvider class should specify both DataProvider name and its class in the @Test attributes.