Test file and function naming conventions in PyTest - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify valid pytest test file names

Which of the following file names will pytest automatically recognize as test files when running tests?

A test_math.py, utils.py, helpers_test.py

B math_test.py, utils.py, test_helpers.py

C math.py, utils.py, helpers.py

D test_math.py, test_utils.py, math_test.py

💡 Hint

pytest looks for files starting with 'test_' or ending with '_test.py'.

pytest automatically discovers test files that start with test_ or end with _test.py. Option D lists files that follow these conventions.

🧠 Conceptual

intermediate

Identify valid pytest test function names

Which function names will pytest recognize as test functions inside a test file?

A test_addition, check_subtraction, test_multiplication

B add_test, subtract_test, multiply_test

C test_addition, test_subtraction, test_multiplication

D addition_test, test_subtraction, multiplication_test

💡 Hint

pytest looks for functions starting with 'test'.

pytest recognizes functions that start with test as test functions. Option C has all functions starting with test.

❓ assertion

advanced

Assertion failure due to incorrect test function name

Given the following test file named test_math.py with these functions, which function will NOT run during pytest execution?

PyTest

def test_add():
    assert 1 + 1 == 2

def check_subtract():
    assert 2 - 1 == 1

def test_multiply():
    assert 2 * 3 == 6

A check_subtract

B All functions run

C test_multiply

D test_add

💡 Hint

pytest only runs functions starting with 'test'.

pytest runs only functions whose names start with test. The function check_subtract does not start with test, so it will not run.

🔧 Debug

advanced

Debug why pytest does not find tests in a file

You have a file named mathTests.py with functions named test_add and test_subtract. When running pytest, no tests are found. What is the most likely reason?

A Function names do not start with 'test'

B File name does not start with 'test_' or end with '_test.py'

C Functions are missing assert statements

D pytest is not installed

💡 Hint

pytest discovers test files by their names.

pytest discovers test files only if their names start with test_ or end with _test.py. The file mathTests.py does not follow this convention, so pytest ignores it.

❓ framework

expert

Best practice for organizing pytest test files and functions

Which of the following is the best practice for naming pytest test files and functions to ensure automatic discovery and clear organization?

A Name test files starting with 'test_' and test functions starting with 'test_', use descriptive names for both

B Name test files with any name, but test functions must start with 'test_'

C Name test files ending with '_test.py' but test functions can have any name

D Name test files and functions with any names as long as they are in a 'tests' folder

💡 Hint

pytest discovers tests based on file and function name patterns.

Best practice is to name test files starting with test_ or ending with _test.py and test functions starting with test_. Using descriptive names helps clarity and maintenance.