Selenium testNG Parametrization - Parameters and dataProvider

TestNG provides a way to get the data from external sources like from excel/textfile/arrays which helps to prepare data driven framework in automation.

@Parameters - pass parameters from the testNG.xml

@dataProvider - Pass the parameters as a 2D array.

Let's see the code implementation

@Parameters
-------------------------------------------------------

package annotationpkg;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;
public class parameters {
    @Test
    //@Parameters("url")
    @Parameters({"url", "userName", "password"})
    public void parameterTest(String url, String userName, String password) {
       System.out.println("url under test : " + url);
       System.out.println("userName used : " + userName);
       System.out.println("password used : " + password);
    }
}

and the testng.xml looks like:

xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="MySuite" parallel="none">
<test name="MyTest1">
<parameter name="url" value="www.mylogin.com"/> 
<parameter name="userName" value="user1234"/> 
<parameter name="password" value="12345"/> 
    <classes>
      <class name="annotationpkg.parameters"/>
    </classes>
</test>
</suite>

---------------------------------------------------------------

so we have 3 parameters to pass to our method, so we have given 3 parameter tags in testNG.xml, 

even we can send any type of data type as parameter value like integer, character, string, boolean etc.

@dataProvider

This is another way of passing 2 dimensional array as parameter from a method of same or from different class, let's see one by one.

the @Test method will run number of times depends on the number of data sets provided in the object array.

-----------------From same class------------------

package annotationpkg;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
public class dataprovider {
     @DataProvider(name = "data-provider")
     public Object[][] dataProviderArr() {
     //Create 2 diemensional array
     //can even take the data from an excel sheet or from a Map 
     //and put it into this array variable
         String object[][] = { { "user1", "1234" }, { "user2", "5678" } };
         return object;
     }
     @Test(dataProvider = "data-provider")
     public void fn_Credentials(String userName, String password) {
         System.out.print("UserName is: " + userName);
         System.out.print(" | ");
         System.out.println("Password is: "+ password);
     }
}

Let's say we have the public Object[][] dataProviderArr() method is defined in another class 

(dataProviderArray.class), then we can write:

  -------------------From another class-----------------------------------

public class dataProviderArray{
   @DataProvider(name = "data-provider")
   public Object[][] dataProviderArr() {
     //Create 2 diemensional array
     //can even take the data from an excel sheet or from a Map 
     //and put it into this array variable
     Object[][] obj= { { "user1", "1234" }, { "user2", "5678" } };
     return obj;
   }

------------------------------------------------------------------------------------------

package annotationpkg;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
public class dataprovider {
      
   @Test(dataProvider = "data-provider", dataProviderClass = dataProviderArray.class)
   public void fn_Credentials(String userName, String password)    {
        System.out.print("UserName is: " + userName);
        System.out.print(" | ");
        System.out.println("Password is: "+ password);
   }
}

------------------------------------------------------------

The TestNG.xml looks like (for from same and another class)

<xml version="1.0" encoding="utf-8"?>
<Suite name="MySuite" parallel="none">
<test name="Test1">
    <CLasses>
        <class name="annotationpkg.dataprovider"/>
    </classes>
</test>
</suite> 

Let's see some more details about the testNG, @Test annotation attributes