Window management (maximize, size) in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium Java code snippet?

Consider the following Selenium WebDriver code that opens a browser window and maximizes it. What will be the output of the printed window size?

Selenium Java

WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
Dimension size = driver.manage().window().getSize();
System.out.println(size.getWidth() + "," + size.getHeight());
driver.quit();

A The default browser window size before maximizing, e.g., "800,600"

B The width and height of the screen resolution, e.g., "1920,1080"

C Throws a NullPointerException because size is null

D Prints "0,0" because the window size is not set

💡 Hint

Maximizing the window sets it to the full screen size.

When you call maximize(), the browser window expands to the full screen size. Therefore, getSize() returns the screen's width and height.

❓ assertion

intermediate

Which assertion correctly verifies the browser window is maximized?

You want to write a test assertion in Java using Selenium to check if the browser window is maximized. Which option correctly asserts this?

A assertNotNull(driver.manage().window().getSize());

B assertEquals(driver.manage().window().getSize(), new Dimension(1920, 1080));

C assertFalse(driver.manage().window().getSize().getWidth() < 800);

D assertTrue(driver.manage().window().getSize().getWidth() >= 1920);

💡 Hint

Maximized window width should be at least the screen width.

Option D checks that the window width is at least 1920 pixels, which is a reasonable screen width for maximized windows. Exact equality (B) may fail on different screens.

🔧 Debug

advanced

Why does this Selenium Java code fail to maximize the window?

Given the code below, the browser window does not maximize as expected. What is the most likely cause?

Selenium Java

WebDriver driver = new ChromeDriver();
driver.manage().window().setSize(new Dimension(1024, 768));
driver.manage().window().maximize();
// Window remains 1024x768 instead of maximizing

A The browser is running in headless mode which disables maximize()

B The ChromeDriver version does not support maximize() properly

C The maximize() method must be called before setSize() to work

D The maximize() call is ignored because setSize() was called before it

💡 Hint

Headless mode often disables window resizing features.

When running ChromeDriver in headless mode, maximize() does not work because there is no visible window to resize.

🧠 Conceptual

advanced

What is the difference between maximize() and setSize() in Selenium WebDriver?

Choose the option that best explains the difference between maximize() and setSize() methods for browser windows in Selenium.

A maximize() sets the window to full screen size; setSize() sets to specific dimensions

B maximize() sets a fixed size; setSize() maximizes the window

C Both methods do the same but maximize() is deprecated

D maximize() only works on Firefox; setSize() only works on Chrome

💡 Hint

Think about full screen vs custom size.

maximize() expands the window to full screen size, while setSize() sets the window to the exact width and height you specify.

❓ framework

expert

How to reliably test window maximize behavior across different screen resolutions?

You want to write a Selenium Java test that verifies the browser window maximizes correctly on any screen resolution. Which approach is best?

A Assert window size equals fixed values like 1920x1080 after maximize()

B Skip maximize() and only test setSize() with fixed dimensions

C Compare window size after maximize() to Toolkit.getDefaultToolkit().getScreenSize()

D Use maximize() and assert window size is greater than 800x600

💡 Hint

Screen size varies by device; get it dynamically.

Using Java's Toolkit to get the actual screen size allows you to compare the window size after maximize() dynamically, making the test reliable on any device.

Practice

1. What does the maximize() method do in Selenium WebDriver window management?

easy

A. It retrieves the current size of the browser window.

B. It makes the browser window fill the entire screen.

C. It sets the browser window to a custom size.

D. It closes the browser window.

Solution

1. Step 1: Understand the purpose of maximize()

   The maximize() method is used to enlarge the browser window to fill the entire screen.

2. Step 2: Differentiate from other window methods

   Unlike setSize() which sets a custom size, maximize() fills the screen automatically.

3. Final Answer:

   It makes the browser window fill the entire screen. -> Option B

4. Quick Check:

   maximize() = fills screen [OK]

Hint: maximize() fills the screen fully, setSize() sets custom size [OK]

Common Mistakes:

• Confusing maximize() with setSize()
• Thinking maximize() returns window size
• Assuming maximize() closes the window

2. Which of the following is the correct syntax to set the browser window size to 1024x768 in Selenium Java?

easy

A. driver.manage().window().maximize(1024, 768);

B. driver.window().setSize(1024, 768);

C. driver.setSize(1024, 768);

D. driver.manage().window().setSize(new Dimension(1024, 768));

Solution

1. Step 1: Recall correct method to set window size

   In Selenium Java, setSize() requires a Dimension object with width and height.

2. Step 2: Check syntax correctness

   driver.manage().window().setSize(new Dimension(1024, 768)); correctly uses driver.manage().window().setSize(new Dimension(1024, 768));. Other options misuse method names or parameters.

3. Final Answer:

   driver.manage().window().setSize(new Dimension(1024, 768)); -> Option D

4. Quick Check:

   setSize() needs Dimension object [OK]

Hint: Use new Dimension(width, height) inside setSize() [OK]

Common Mistakes:

• Calling maximize() with parameters
• Using setSize() without Dimension object
• Wrong method chaining like driver.window()

3. What will be the output of the following code snippet?

driver.manage().window().setSize(new Dimension(800, 600));
Dimension size = driver.manage().window().getSize();
System.out.println(size.getWidth() + "," + size.getHeight());

medium

A. 800,600

B. 600,800

C. 0,0

D. Throws a runtime exception

Solution

1. Step 1: Set window size to 800x600

   The code sets the browser window size to width=800 and height=600 using setSize().

2. Step 2: Retrieve and print the window size

   The getSize() method returns the current size, which is then printed as "width,height".

3. Final Answer:

   800,600 -> Option A

4. Quick Check:

   setSize(800,600) then getSize() = 800,600 [OK]

Hint: getSize() returns current size after setSize() [OK]

Common Mistakes:

• Mixing width and height order
• Expecting maximize() effect instead
• Assuming getSize() returns null or error

4. Identify the error in the following Selenium Java code snippet for setting window size:

driver.manage().window().setSize(1024, 768);

medium

A. The method name should be setWindowSize(), not setSize().

B. setSize() cannot be called on driver.manage().window().

C. setSize() requires a Dimension object, not two integers.

D. The code is correct and will run without errors.

Solution

1. Step 1: Check setSize() method parameters

   The setSize() method requires a single Dimension object, not two separate integers.

2. Step 2: Identify the error cause

   Passing two integers directly causes a compile-time error because no matching method exists.

3. Final Answer:

   setSize() requires a Dimension object, not two integers. -> Option C

4. Quick Check:

   setSize() needs Dimension object [OK]

Hint: Always wrap width and height in new Dimension() for setSize() [OK]

Common Mistakes:

• Passing width and height as separate arguments
• Using wrong method name
• Ignoring compile-time errors

5. You want to maximize the browser window and then verify if the window width is greater than 1200 pixels. Which code snippet correctly performs this check in Selenium Java?

hard

A. driver.manage().window().maximize();
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

B. driver.manage().window().setSize(new Dimension(1200, 800));
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

C. driver.manage().window().maximize(1200, 800);
Dimension size = driver.manage().window().getSize();
if (size.getWidth() > 1200) {
System.out.println("Width is greater than 1200");
}

D. driver.manage().window().maximize();
Dimension size = driver.manage().window().getSize();
if (size.getHeight() > 1200) {
System.out.println("Width is greater than 1200");
}

Solution

1. Step 1: Maximize the browser window

   Use maximize() without parameters to fill the screen.

2. Step 2: Get window size and check width

   Retrieve size with getSize() and compare width with 1200 pixels.

3. Step 3: Verify correctness of condition and output

   driver.manage().window().maximize(); Dimension size = driver.manage().window().getSize(); if (size.getWidth() > 1200) { System.out.println("Width is greater than 1200"); } correctly checks width > 1200 and prints the message.

4. Final Answer:

   Option A code snippet correctly maximizes and checks width. -> Option A

5. Quick Check:

   maximize() then getSize().getWidth() > 1200 [OK]

Hint: maximize() no params; getSize() then check width [OK]

Common Mistakes:

• Passing parameters to maximize()
• Checking height instead of width
• Using setSize() instead of maximize() for full screen