TestNG

1. What is dataprovider and why we use them?

Ans : a. A DataProvider is an annotation in TestNG (@DataProvider) that supplies test data to a test method.
b. It returns data in the form of a two-dimensional object array (Object[][]).
c.Each row in the array represents one set of test data, and TestNG executes the test method once per row.

@DataProvider(name = "loginData")
public Object[][] getData() {
    return new Object[][] {
        {"user1", "password1"},
        {"user2", "password2"},
        {"user3", "password3"}
    };
}

@Test(dataProvider = "loginData")
public void loginTest(String username, String password) {
    System.out.println("Testing login with: " + username + " / " + password);
}

2. What is parameter and Data Provider.

Ans :
Parameter :

  a. Declared in testng.xml using <parameter> tags.
  b. Values are injected into test methods using @Parameters.
  c. Static: Each parameter runs the test only once per execution.
  d. Best for environment values (e.g., base.url, browser, credentials).
  

<suite name="AutomationSuite">
  <test name="LoginTest">
    <parameter name="username" value="admin"/>
    <parameter name="password" value="admin123"/>
    <classes>
      <class name="com.abhi.tests.LoginTest"/>
    </classes>
  </test>
</suite>

@Parameters({"username", "password"})
@Test
public void loginTest(String user, String pass) {
    System.out.println("Login with: " + user + " / " + pass);
}


DataProviders
a. Declared in code using @DataProvider.
b. Returns a 2D Object array (Object[][]).
c. Dynamic: Runs the test multiple times with different data sets.
d. Best for testing multiple inputs (e.g., multiple login credentials, product variations).

@DataProvider(name = "loginData")
public Object[][] getData() {
return new Object[][] {
{"user1", "pass1"},
{"user2", "pass2"},
{"user3", "pass3"}
};
}

@Test(dataProvider = "loginData")
public void loginTest(String user, String pass) {
System.out.println("Login with: " + user + " / " + pass);
}