How to pass parameters to JUNIT or TestNG test case.

You can parametrize your test cases using excel sheet. With the help you TestNG we can pass different set of data to our test cases by following steps

1. create a data file excel rename column as username and fill below data like

username  
test1         
test2
test3
test4

2. create a dsn through control pannel--> administrative tool--> Data source (ODBC) --> select system dsn --> click add
then select "dirver do microsoft excel" select workbook your data file which you created above.

now your data source and provider is ready now connect this in your test cases using java class for

Class.forName("sun.jdbc.odbc.
JdbcOdbcDriver");


3. Write the test cases

import org.openqa.selenium.server.RemoteControlConfiguration;
import com.thoughtworks.selenium.*;
import org.openqa.selenium.server.*;
import org.testng.annotations.*;
public class TestExcel extends SeleneseTestBase {
@BeforeClass
public void setUp()throws Exception{

RemoteControlConfiguration rc = new RemoteControlConfiguration();
rc.trustAllSSLCertificates();
seleniumServer = new SeleniumServer(rc);
selenium = new DefaultSelenium("localhost",4444,"*iexplore","http://www.yahoo.com");
seleniumServer.start();
selenium.start();
}
@Test
public  void testread()throws Exception{
// Connection connection = null;


try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection( "jdbc:odbc:nk" );
// Connection con = DriverManager.getConnection( "jdbc:odbc:nk" ); here you write your driver which you created using ODBC connecting excel workbook.

Statement st = con.createStatement();
ResultSet rs = st.executeQuery( "Select * from [Sheet1$]" );

ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();

while (rs.next()) {

for (int i = 1; i <= numberOfColumns; i++) {
if (i > 1) System.out.print(", ");
String columnValue = rs.getString(i);
System.out.print(columnValue);
selenium.open("/");

pause(5000);
selenium.click("link=Sign in");
selenium.waitForPageToLoad("30000");


try {
if (selenium.isElementPresent("//a[@id='overridelink']"))
selenium.click("//a[@id='overridelink']");
}
catch (Exception e) {}
pause(30000);
selenium.type("userid", columnValue);
selenium.type("pass","password");
selenium.click("//button[@class='bfbt' and @type='submit']");
pause(8000);
String wc = selenium.getTable("//div[@id='dynamicmenu-hdrCtr']/table[1].0.1");
System.out.print(wc);

selenium.click("link=Sign out");
selenium.waitForPageToLoad("20000");
selenium.isTextPresent("Welcome!");

}
System.out.println("");   

}

st.close();
con.close();

} catch(Exception ex) {
System.err.print("Exception: ");
System.err.println(ex.getMessage());
}
}
}