Data Driven Testing

Advantages of using data driven framework:

• Re-usable code
• Better test coverage
• Less Maintenance

E.g:  using invalid login scenario as an example. 

1.  define a negative login method on LgoinPage.java

//Find the locator of the error message

By loginErrorLocator = By.id("flash-messages");

//Define a negativeLogin method

public void negativeLogin(String username, String password) {
System.out.println("Entering username and password:");
find(usernameLocator).sendKeys(username);
find(passwordLocator).sendKeys(password);
System.out.println("Click Logon button");
find(submitLocator).click();

//invoke the waitLoginError method to wait for error appear
waitLoginError();

}

//define a method to wait erro msg appear, invoke the waitForVisibilityOf method defefined in baseObject.java
public void waitLoginError() {
waitForVisibilityOf(loginErrorLocator, 5);
}

//define get error msg method. invoke find method defined in baseObject.java

public String getLoginError() {
return find(loginErrorLocator).getText();
}

2. Define the data provider method on baseTest.java (this base test includes setup. teardown..)

@DataProvider(name = "negativeLoginData")
public static Object[][] negativeLoginData(){
return new Object[][] {
{"IncorrectUserName", "Password!", "Your username is invalid!"},
{"username","incorrectPassword", "Your password is invalid!"}
};
}

3. Define test method to use the dataProvider

@Test(dataProvider="negativeLoginData")
public void netgativeLoginTest(String username, String password, String expectedErrorMessage ) {
LoginPage lp = new LoginPage(driver);
lp.open();
lp.negativeLogin(username, password);

String errorMessage = lp.getLoginError();
//verification
Assert.assertTrue(errorMessage.contains(expectedErrorMessage), "Actual and expected error messages are different. Expected:"+expectedErrorMessage+"Actual:"+errorMessage);
}

4. Update the testng.xml to include the negative test case

e.g.

<test name="NegativeLogin Test">
<classes>
<class name="com.test.FirstTest">
<methods>
<include name="netgativeLoginTest"></include>
</methods>
</class>
</classes>
</test>