Test functions and classes in Selenium Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a test function using pytest.

Selenium Python

def [1]():
    assert 2 + 2 == 4

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

Aaddition_test

Btest_addition

Ccheck_add

Dverify_sum

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the function without 'test_' prefix so pytest ignores it.

Using spaces or special characters in the function name.

The test function must start with test_ so pytest can recognize it.

2fill in blank

medium

Complete the code to import the Selenium WebDriver for Chrome.

Selenium Python

from selenium.webdriver import [1]

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

AChrome

BFirefox

CEdge

DSafari

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Firefox or other browsers when Chrome is needed.

Misspelling the browser name.

To automate Chrome browser, import Chrome from selenium.webdriver.

3fill in blank

hard

Fix the error in the test class definition for pytest.

Selenium Python

class [1]:
    def test_example(self):
        assert True

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

ATestExample

BExampleTest

CexampleTest

Dtestexample

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or names not starting with 'Test' for test classes.

Forgetting to capitalize the class name properly.

Pytest recognizes test classes only if their names start with Test.

4fill in blank

hard

Fill both blanks to create a Selenium test that opens a page and checks the title.

Selenium Python

from selenium import webdriver

class TestPageTitle:
    def test_title(self):
        driver = webdriver.[1]()
        driver.get('https://example.com')
        assert driver.title [2] 'Example Domain'
        driver.quit()

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

AChrome

B==

C!=

DFirefox

Attempts:

3 left

💡 Hint

Common Mistakes

Using Firefox WebDriver when Chrome is intended.

Using '!=' instead of '==' in the assertion.

Use webdriver.Chrome() to open Chrome and == to assert the title matches exactly.

5fill in blank

hard

Fill all three blanks to create a pytest test function that finds an element by ID and asserts its text.

Selenium Python

from selenium import webdriver
from selenium.webdriver.common.by import [1]

def test_element_text():
    driver = webdriver.Chrome()
    driver.get('https://example.com')
    element = driver.find_element([2], 'example-id')
    assert element.text [3] 'Example Domain'
    driver.quit()

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

ABy

BBy.ID

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Not importing 'By' and trying to use it directly.

Using wrong locator like 'By.NAME' instead of 'By.ID'.

Using '!=' instead of '==' in assertion.

Import By to specify locator type, use By.ID to find by ID, and == to assert text equality.

Practice

1. What is the main purpose of using test functions and classes in Selenium Python testing?

easy

A. To organize tests clearly and run them easily

B. To make the code run faster

C. To avoid writing any assertions

D. To skip browser setup

Solution

1. Step 1: Understand test organization

   Test functions and classes help group related tests logically.

2. Step 2: Recognize ease of running tests

   Using classes and functions allows running tests easily with frameworks like unittest.

3. Final Answer:

   To organize tests clearly and run them easily -> Option A

4. Quick Check:

   Test organization = To organize tests clearly and run them easily [OK]

Hint: Tests group checks for clarity and easy running [OK]

Common Mistakes:

• Thinking tests speed up code execution
• Believing assertions are optional
• Ignoring setup and teardown roles

2. Which of the following is the correct way to define a test method inside a unittest.TestCase class in Selenium Python?

easy

A. def test_example(self):

B. def example_test():

C. def TestExample(self):

D. def _test_example(self):

Solution

1. Step 1: Recall unittest naming conventions

   Test methods must start with 'test' and accept 'self' as first parameter.

2. Step 2: Check method definitions

   Only 'def test_example(self):' follows correct naming and signature.

3. Final Answer:

   def test_example(self): -> Option A

4. Quick Check:

   Method name starts with 'test' and has 'self' [OK]

Hint: Test methods start with 'test' and include self [OK]

Common Mistakes:

• Omitting 'self' parameter
• Not starting method name with 'test'
• Using uppercase 'Test' prefix

3. What will be the output when running this test code snippet?

import unittest

class MyTest(unittest.TestCase):
    def test_pass(self):
        self.assertEqual(2 + 2, 4)

    def test_fail(self):
        self.assertTrue(False)

if __name__ == '__main__':
    unittest.main(exit=False)

medium

A. Both tests pass

B. One test passes, one test fails

C. Both tests fail

D. Syntax error occurs

Solution

1. Step 1: Analyze test_pass method

   assertEqual(2 + 2, 4) is True, so test_pass passes.

2. Step 2: Analyze test_fail method

   assertTrue(False) fails, so test_fail fails.

3. Final Answer:

   One test passes, one test fails -> Option B

4. Quick Check:

   One True, one False assertion = One test passes, one test fails [OK]

Hint: Check each assertion's truth to predict pass/fail [OK]

Common Mistakes:

• Assuming all tests pass
• Ignoring assertTrue(False) fails
• Expecting syntax errors

4. Identify the error in this Selenium Python unittest code:

import unittest
from selenium import webdriver

class TestLogin(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Chrome()

    def test_login(self):
        self.driver.get('http://example.com')
        self.assertIn('Example', self.driver.title)

    def tearDown(self):
        self.driver.quit()

if __name__ == '__main__':
    unittest.main()

medium

A. webdriver.Chrome() requires path argument

B. Missing call to super() in setUp and tearDown

C. No error; code is correct

D. assertIn should be assertEquals

Solution

1. Step 1: Review setup and teardown methods

   setUp creates driver; tearDown quits it properly.

2. Step 2: Check assertion and webdriver usage

   assertIn checks substring in title correctly; webdriver.Chrome() works if driver is in PATH.

3. Final Answer:

   No error; code is correct -> Option C

4. Quick Check:

   Standard unittest setup and teardown used [OK]

Hint: Check if setup/teardown and assertions follow unittest rules [OK]

Common Mistakes:

• Assuming webdriver.Chrome() always needs path
• Confusing assertIn with assertEquals
• Forgetting to quit driver in tearDown

5. You want to run multiple Selenium tests that share the same browser setup and cleanup. Which unittest structure best achieves this?

hard

A. Call unittest.main() inside each test method

B. Write separate test functions without any setup or teardown

C. Create a new webdriver instance inside each test method

D. Use a TestCase class with setUpClass and tearDownClass class methods

Solution

1. Step 1: Understand shared setup/cleanup needs

   setUpClass and tearDownClass run once for all tests in a class, ideal for shared browser setup.

2. Step 2: Evaluate other options

   Separate functions lack shared setup; new webdriver per test is inefficient; unittest.main() runs all tests, not per method.

3. Final Answer:

   Use a TestCase class with setUpClass and tearDownClass class methods -> Option D

4. Quick Check:

   Shared setup/cleanup = setUpClass/tearDownClass [OK]

Hint: Use setUpClass/tearDownClass for shared browser setup [OK]

Common Mistakes:

• Creating driver in each test wastes resources
• Calling unittest.main() multiple times causes errors
• Skipping setup causes flaky tests