File download handling in Selenium Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the download directory in ChromeOptions.

Selenium Java

ChromeOptions options = new ChromeOptions();
Map<String, Object> prefs = new HashMap<>();
prefs.put("download.default_directory", [1]);
options.setExperimentalOption("prefs", prefs);

Drag options to blanks, or click blank then click option'

A"C:/Downloads"

B"/tmp"

C"C:/Program Files"

D"/usr/local/bin"

Attempts:

3 left

💡 Hint

Common Mistakes

Using an invalid path string or missing quotes.

Setting the preference key incorrectly.

The download.default_directory preference must be set to the desired download folder path as a string.

2fill in blank

medium

Complete the code to wait until the file is downloaded by checking the file existence.

Selenium Java

File file = new File("C:/Downloads/report.pdf");
WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(30));
wait.until(driver -> [1]);

Drag options to blanks, or click blank then click option'

Afile.canRead()

Bfile.isDirectory()

Cfile.isHidden()

Dfile.exists()

Attempts:

3 left

💡 Hint

Common Mistakes

Using isDirectory() which checks if the path is a folder.

Using canRead() or isHidden() which do not confirm file presence.

To confirm the file is downloaded, we wait until the file exists in the download folder.

3fill in blank

hard

Fix the error in the code that tries to delete the downloaded file after test completion.

Selenium Java

File downloadedFile = new File("C:/Downloads/report.pdf");
if ([1]) {
    downloadedFile.delete();
}

Drag options to blanks, or click blank then click option'

AdownloadedFile.isFile()

BdownloadedFile.exists()

CdownloadedFile.canWrite()

DdownloadedFile.isDirectory()

Attempts:

3 left

💡 Hint

Common Mistakes

Using isDirectory() which is false for files.

Using canWrite() which checks permissions but not existence.

Before deleting, check if the file exists using exists() method to avoid errors.

4fill in blank

hard

Fill both blanks to configure Firefox profile to auto-download PDF files without prompt.

Selenium Java

FirefoxProfile profile = new FirefoxProfile();
profile.setPreference("browser.download.folderList", [1]);
profile.setPreference("browser.helperApps.neverAsk.saveToDisk", [2]);

Drag options to blanks, or click blank then click option'

A2

B"application/pdf"

C1

D"text/plain"

Attempts:

3 left

💡 Hint

Common Mistakes

Using folderList 1 which is default downloads folder.

Setting wrong MIME type that does not match PDF files.

Setting folderList to 2 uses a custom folder, and neverAsk.saveToDisk to "application/pdf" disables the save prompt for PDFs.

5fill in blank

hard

Fill all three blanks to create a test that clicks a download link, waits for the file, and asserts its existence.

Selenium Java

driver.findElement(By.id([1])).click();
File file = new File([2]);
new WebDriverWait(driver, Duration.ofSeconds(20)).until(d -> file.[3]);

Drag options to blanks, or click blank then click option'

A"downloadLink"

B"C:/Downloads/testfile.zip"

Cexists()

DisFile()

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong element id or file path string.

Waiting on isFile() which may be false if file is not fully ready.

Click the element with id "downloadLink", check the file path, and wait until the file exists.

Practice

1. What is the main purpose of handling file downloads in Selenium tests?

easy

A. To verify that files are downloaded correctly without manual intervention

B. To upload files to the web application

C. To change the browser's homepage

D. To clear browser cookies automatically

Solution

1. Step 1: Understand file download handling

   File download handling in Selenium is used to check if files are saved correctly during automated tests.

2. Step 2: Identify the correct purpose

   Among the options, only verifying file downloads matches this purpose.

3. Final Answer:

   To verify that files are downloaded correctly without manual intervention -> Option A

4. Quick Check:

   File download handling = verify downloads [OK]

Hint: File download handling checks saved files, not uploads [OK]

Common Mistakes:

• Confusing download handling with file upload
• Thinking it changes browser settings unrelated to downloads
• Assuming it clears cookies automatically

2. Which Java code snippet correctly sets Chrome options to automatically download files to a folder without popup?

easy

A. ChromeOptions options = new ChromeOptions(); options.addArguments("--disable-popup-blocking");

B. ChromeOptions options = new ChromeOptions(); options.setHeadless(true);

C. ChromeOptions options = new ChromeOptions(); Map prefs = new HashMap<>(); prefs.put("download.default_directory", "/path/to/download"); options.setExperimentalOption("prefs", prefs);

D. ChromeOptions options = new ChromeOptions(); options.addArguments("--start-maximized");

Solution

1. Step 1: Identify how to set download folder in ChromeOptions

   Setting the "download.default_directory" preference in ChromeOptions disables popup and sets download path.

2. Step 2: Match code snippet with correct setting

   ChromeOptions options = new ChromeOptions(); Map prefs = new HashMap<>(); prefs.put("download.default_directory", "/path/to/download"); options.setExperimentalOption("prefs", prefs); correctly creates prefs map and sets it as experimental option for ChromeOptions.

3. Final Answer:

   ChromeOptions options = new ChromeOptions(); Map prefs = new HashMap<>(); prefs.put("download.default_directory", "/path/to/download"); options.setExperimentalOption("prefs", prefs); -> Option C

4. Quick Check:

   Set prefs for download folder = ChromeOptions options = new ChromeOptions(); Map prefs = new HashMap<>(); prefs.put("download.default_directory", "/path/to/download"); options.setExperimentalOption("prefs", prefs); [OK]

Hint: Use prefs map with "download.default_directory" for downloads [OK]

Common Mistakes:

• Using addArguments instead of prefs for download folder
• Setting headless mode does not affect downloads
• Forgetting to set experimental options

3. Given the following code snippet, what will be the output if the file is downloaded successfully?

File file = new File("/downloads/report.pdf");
boolean isDownloaded = file.exists();
System.out.println(isDownloaded);

medium

A. false

B. Compilation error

C. FileNotFoundException

D. true

Solution

1. Step 1: Understand file.exists() method

   The exists() method returns true if the file exists at the given path, false otherwise.

2. Step 2: Analyze the scenario

   If the file "report.pdf" is downloaded successfully to "/downloads", file.exists() returns true and prints it.

3. Final Answer:

   true -> Option D

4. Quick Check:

   file.exists() = true if file present [OK]

Hint: file.exists() returns true if file is present [OK]

Common Mistakes:

• Assuming file.exists() throws exception if file missing
• Confusing boolean output with exceptions
• Thinking it returns file content

4. You wrote this code to check file download but the test always fails. What is the likely issue?

File file = new File("/downloads/report.pdf");
assertTrue(file.exists());

Options:

medium

A. The test does not wait for the download to complete before checking

B. The file path is incorrect syntax in Java

C. assertTrue is not a valid assertion method

D. File class cannot check file existence

Solution

1. Step 1: Identify timing issue in file existence check

   The test may check file existence before download finishes, causing false failure.

2. Step 2: Understand need for wait or polling

   Adding wait or retry logic ensures file is fully downloaded before assertion.

3. Final Answer:

   The test does not wait for the download to complete before checking -> Option A

4. Quick Check:

   Wait for download before assertTrue(file.exists()) [OK]

Hint: Always wait for download to finish before checking file [OK]

Common Mistakes:

• Assuming file path syntax is wrong
• Thinking assertTrue is invalid
• Believing File class can't check existence

5. You want to verify a file download in Selenium Java tests for multiple file types (.pdf, .csv, .xlsx) saved in the same folder. Which approach best ensures correct file download handling?

hard

A. Check only the file size of the last downloaded file without verifying extension

B. Set browser to download automatically, then check folder for new file with expected extension after triggering download

C. Use Thread.sleep(5000) after download trigger and assume file is saved

D. Manually open the download popup and click save for each file type

Solution

1. Step 1: Configure browser for automatic downloads

   Setting browser preferences to auto-download files avoids popup interruptions for all file types.

2. Step 2: Verify download by checking folder for new file with expected extension

   After triggering download, checking the folder for a new file with the correct extension confirms success reliably.

3. Final Answer:

   Set browser to download automatically, then check folder for new file with expected extension after triggering download -> Option B

4. Quick Check:

   Auto-download + check file extension = reliable verification [OK]

Hint: Auto-download + check folder for new file extension [OK]

Common Mistakes:

• Relying on manual popup handling in automated tests
• Using fixed sleep without checking file presence
• Ignoring file extension verification