Markers for categorization in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Purpose of Markers in pytest

What is the main purpose of using markers in pytest for test categorization?

A To group tests so you can selectively run subsets based on categories

B To automatically fix failing tests during runtime

C To convert test functions into classes

D To generate HTML reports without additional plugins

💡 Hint

Think about how you can run only some tests and skip others easily.

Markers help label tests so you can run only tests with certain labels, making test runs faster and more focused.

❓ Predict Output

intermediate

Output of pytest marker usage

Given the following pytest code, what will be the output when running `pytest -m smoke`?

Selenium Python

import pytest

@pytest.mark.smoke
def test_login():
    assert True

@pytest.mark.regression
def test_logout():
    assert True

@pytest.mark.smoke
def test_search():
    assert True

A Runs all three tests, all pass

B Runs test_login and test_search only, both pass

C Runs test_logout only, passes

D No tests run, error about unknown marker

💡 Hint

The -m option runs tests with the given marker only.

Using `pytest -m smoke` runs only tests marked with @pytest.mark.smoke, so test_login and test_search run and pass.

❓ assertion

advanced

Correct assertion for marker presence

Which assertion correctly checks if a test function has the marker 'regression' in pytest?

Selenium Python

def test_example(request):
    # How to assert 'regression' marker is present on this test?
    pass

A assert hasattr(request.node, 'regression')

B assert 'regression' in request.node.keywords

C assert request.node.marker == 'regression'

D assert request.node.get_closest_marker('regression') is not None

💡 Hint

Use the pytest API to get markers safely.

The get_closest_marker method returns the marker object or None if not found, so checking for not None confirms presence.

🔧 Debug

advanced

Fix marker registration error

You get this error when running pytest: "PytestUnknownMarkWarning: Unknown pytest.mark.regression - is this a typo?". What is the cause?

A The marker 'regression' is not registered in pytest.ini or pyproject.toml

B The test function name does not start with 'test_'

C The marker is misspelled in the test code

D pytest version is too old to support markers

💡 Hint

Check your pytest configuration files for marker declarations.

Pytest requires custom markers to be registered in configuration files to avoid warnings.

❓ framework

expert

Combining markers and fixtures for selective setup

You want to run a setup fixture only for tests marked with 'db'. Which pytest feature allows this selective fixture application?

A Use pytest hooks to skip fixture for unmarked tests

B Use @pytest.fixture(only_for='db') decorator

C Use autouse=True on fixture and check marker inside fixture code

D Use @pytest.mark.usefixtures('db_setup') on tests and mark tests with 'db'

💡 Hint

Think about how to run fixture code conditionally without decorating every test.

Setting autouse=True runs fixture for all tests, but inside fixture you can check if marker is present and skip setup if not.

Practice

1. What is the main purpose of using markers in pytest with Selenium tests?

easy

A. To write test cases faster

B. To label and organize tests for selective running

C. To automatically fix test failures

D. To generate test reports

Solution

1. Step 1: Understand what markers do

   Markers are used to label tests so you can group or select them easily.

2. Step 2: Identify the main purpose

   This helps run only certain tests or skip some, improving test control.

3. Final Answer:

   To label and organize tests for selective running -> Option B

4. Quick Check:

   Markers = Organize tests [OK]

Hint: Markers help pick which tests to run or skip [OK]

Common Mistakes:

• Thinking markers speed up writing tests
• Believing markers fix test errors automatically
• Confusing markers with report generation

2. Which is the correct way to add a marker named smoke to a test function in pytest?

easy

A. @pytest.mark.smoke\ndef test_example(): pass

B. @pytest.mark('smoke')\ndef test_example(): pass

C. @pytest.mark[smoke]\ndef test_example(): pass

D. @pytest.mark->smoke\ndef test_example(): pass

Solution

1. Step 1: Recall pytest marker syntax

   Markers use dot notation: @pytest.mark.marker_name above the test.

2. Step 2: Match syntax to options

   Only @pytest.mark.smoke\ndef test_example(): pass uses correct dot notation without extra symbols.

3. Final Answer:

   @pytest.mark.smoke\ndef test_example(): pass -> Option A

4. Quick Check:

   Marker syntax = dot notation [OK]

Hint: Use dot notation: @pytest.mark.marker_name [OK]

Common Mistakes:

• Using parentheses instead of dot notation
• Using brackets or arrows incorrectly
• Missing the @ symbol before pytest.mark

3. Given this pytest code snippet, what tests will run if you execute pytest -m smoke?

@pytest.mark.smoke
def test_login(): pass

@pytest.mark.regression
def test_checkout(): pass

def test_search(): pass

medium

A. Only test_login

B. Only test_checkout

C. Both test_login and test_checkout

D. All three tests

Solution

1. Step 1: Understand pytest -m option

   The -m option runs tests with the given marker only.

2. Step 2: Identify tests with 'smoke' marker

   Only test_login has @pytest.mark.smoke.

3. Final Answer:

   Only test_login -> Option A

4. Quick Check:

   pytest -m smoke runs smoke tests only [OK]

Hint: -m runs tests with matching marker only [OK]

Common Mistakes:

• Running all tests ignoring markers
• Confusing marker names
• Assuming unmarked tests run with any marker

4. You wrote this test with a marker but it does not run when you use pytest -m regression. What is the error?

@pytest.mark.regresion
def test_payment(): pass

medium

A. Test function name is incorrect

B. Missing @ symbol before pytest.mark

C. Marker name is misspelled

D. pytest -m cannot run marked tests

Solution

1. Step 1: Check marker spelling

   The marker used is 'regresion' but command uses 'regression'.

2. Step 2: Understand effect of misspelling

   pytest -m regression won't find tests marked 'regresion', so test is skipped.

3. Final Answer:

   Marker name is misspelled -> Option C

4. Quick Check:

   Marker spelling must match exactly [OK]

Hint: Check marker spelling matches command exactly [OK]

Common Mistakes:

• Typos in marker names
• Forgetting @ before pytest.mark
• Assuming pytest runs all marked tests without -m

5. You want to run all tests except those marked slow. Which pytest command should you use?

hard

A. pytest -m slow

B. pytest --exclude slow

C. pytest --skip slow

D. pytest -m "not slow"

Solution

1. Step 1: Understand pytest marker expressions

   To exclude tests with a marker, use -m "not marker_name" syntax.

2. Step 2: Match command to requirement

   pytest -m "not slow" uses "not slow" to run all tests except those marked slow.

3. Final Answer:

   pytest -m "not slow" -> Option D

4. Quick Check:

   Use -m "not marker" to exclude tests [OK]

Hint: Use -m "not marker" to skip marked tests [OK]

Common Mistakes:

• Using -m marker to run only those tests
• Using unsupported --skip or --exclude options
• Not quoting the expression with spaces