The Tool Desk
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What OOP solves in test automation
A UI test written entirely as a direct script often mixes scenario intent with implementation details: selectors, clicks, waits, field entry, and assertions sit together. If the same locator or interaction appears in several tests, a UI change can leave several places to update. The tests can also become harder to scan because the mechanics obscure the workflow.
OOP offers a way to give related data and behavior a clear owner. In UI automation, that often means grouping knowledge about a page or reusable page region into an object. The test calls meaningful operations on that object rather than repeating the mechanics of finding and operating controls.
Encapsulation
Encapsulation hides implementation details behind an interface. A login page object, for example, can expose a loginAs operation while keeping the username selector, password selector, submit button, and interaction sequence inside the class. When the page markup changes, the relevant page-specific code is easier to locate.
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Inheritance and polymorphism
Inheritance and polymorphism are also OOP concepts that can appear in test code, but “using OOP” does not mean building a deep inheritance tree. Use inheritance only when a genuinely shared behavior or contract benefits from it. When a page is made up of reusable regions, composition—building the page object from component objects—is often a more direct fit.
What a Page Object is—and what it is not
A Page Object is an object-oriented class that acts as an interface to a page in the application under test. Tests use its page-level operations when they need to interact with that page. The object should generally describe services the page offers and hide its HTML structure from test authors.
It is not a wrapper class for every DOM element, nor a place to put the whole test scenario. Keep an object only where it provides a useful boundary: a page with meaningful operations, or a reusable region such as navigation or a product list.
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Build a Page Object and keep assertions in the test
This Java example uses Selenium WebDriver. The page object owns selectors and interactions; the test owns the assertion about the behavior being tested.
Page object
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
public class LoginPage {
private final WebDriver driver;
private final By username = By.id("username");
private final By password = By.id("password");
private final By submit = By.cssSelector("button[type='submit']");
private final By errorMessage = By.cssSelector("[role='alert']");
public LoginPage(WebDriver driver) {
this.driver = driver;
}
public void open(String baseUrl) {
driver.get(baseUrl + "/login");
}
public void loginAs(String user, String secret) {
driver.findElement(username).sendKeys(user);
driver.findElement(password).sendKeys(secret);
driver.findElement(submit).click();
}
public String errorMessage() {
return driver.findElement(errorMessage).getText();
}
}The class accepts its WebDriver from the outside rather than creating a browser itself. That keeps browser setup and lifecycle decisions with the test or its test framework. The method names express page operations; the selectors remain private implementation details.
Test
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
class LoginTest {
@Test
void invalidCredentialsShowAnError() {
WebDriver driver = new ChromeDriver();
try {
LoginPage login = new LoginPage(driver);
login.open("https://example.test");
login.loginAs("wrong-user", "wrong-password");
assertEquals("Invalid username or password", login.errorMessage());
} finally {
driver.quit();
}
}
}The example assumes the project already has Selenium and JUnit configured, a compatible Chrome browser and WebDriver available, and an application at the example URL with the shown controls. Replace the URL, selectors, and expected message with the application’s actual values. In a real suite, use the project’s existing driver-management mechanism where one is provided.
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Why the assertion belongs in the test
The test knows the expected result for this scenario; the page object knows how to interact with the page and expose observable information. Selenium’s guidance says page objects should not make verifications or assertions, while identifying checking that the expected page loaded as a limited exception. A getter-style method such as errorMessage() lets the test make the assertion explicitly.
When to add component objects
For a complex page, model a reusable region as a component object when it has coherent behavior or is shared across pages. A page can then hold component objects and delegate region-specific work to them. This is composition: the page is assembled from parts that reflect the interface, rather than inheriting an expanding chain of page classes.
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For example, a product-list component might expose operations such as productNamed(name) or addProductToCart(name). Avoid turning every link, label, or container into a class; the abstraction should make the test clearer or keep meaningful shared behavior in one place.
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Direct scripts versus Page Objects
| Concern | Direct UI script | Page Object approach |
|---|---|---|
| UI change | Repeated selectors or interactions may need edits in multiple tests. | Page-specific knowledge is centralized, so a relevant fix can often be made in the corresponding object. |
| Test readability | Locator and browser mechanics can crowd the scenario. | Page-level operations can make the workflow easier to read. |
| Responsibility | Scenario, UI operation, and expected outcome may be mixed together. | Page object operates the UI; test states and verifies the expected outcome. |
| Reuse | Shared interaction code may be repeated. | Components can reduce duplication when they represent real reusable regions, but unnecessary abstractions add coupling. |
| Isolation | State and setup can be hard to reason about if tests depend on each other. | Objects can clarify boundaries, but test independence still requires deliberate setup and state management. |
Centralization is a maintenance rationale, not a quantified promise: it does not guarantee that changes take less time or that every test suite will improve. Selenium presents its material as recommendations rather than a universal best-practice prescription; choose a design that fits the application and test environment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep tests independent
OOP structure does not by itself make tests reliable. Selenium’s test-practice guidance emphasizes test independence and avoiding shared state. A test should establish the conditions it needs and should not rely on another test having run first. A fresh browser per test is one way to limit browser-state leakage; the right lifecycle can depend on the framework and execution cost.
- Do not store scenario-specific mutable state in a shared page object used by unrelated tests.
- Make setup and cleanup explicit so a failed test does not leave later tests dependent on its result.
- Keep page objects focused on page operations instead of turning them into global test utilities.
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Further reading
Angie Jones’s chapter “Using Object-Oriented Principles in Test Code” in 97 Things Every Java Programmer Should Know covers encapsulation, inheritance, polymorphism, and the Page Object Model. O’Reilly’s chapter page is Using Object-Oriented Principles in Test Code.
Frequently Asked Questions
Is the Page Object Model a Selenium requirement?
No. Selenium presents Page Objects as a recommended design approach, not a requirement for every test suite.
Does using a Page Object make a test independent?
No. Independence depends on test setup, state management, and avoiding dependencies between test cases; the object pattern alone does not provide it.
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