Test file and function naming conventions in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to name the test file correctly for pytest.

PyTest

File name should start with [1] to be recognized by pytest.

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

Atest_

Bcheck_

Crun_

Dverify_

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'check_' or 'run_' as file prefixes which pytest does not recognize automatically.

Pytest recognizes test files that start with test_.

2fill in blank

medium

Complete the code to name the test function correctly for pytest.

PyTest

Test functions should start with [1] to be discovered by pytest.

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

Atest_

Bverify_

Crun_

Dcheck_

Attempts:

3 left

💡 Hint

Common Mistakes

Naming test functions without the 'test_' prefix, so pytest skips them.

Pytest discovers test functions that start with test_.

3fill in blank

hard

Fix the error in the test function name to make pytest recognize it.

PyTest

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

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

Acheck

Btest

Crun

Dverify

Attempts:

3 left

💡 Hint

Common Mistakes

Using prefixes like 'check' or 'run' which pytest does not recognize.

Test functions must start with test_ for pytest to find them.

4fill in blank

hard

Fill both blanks to write a correct pytest test function name and file name.

PyTest

File: [1]example.py
Function: def [2]_addition():
    assert 2 + 2 == 4

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

Atest_

Bcheck_

Ctest

Drun_

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing prefixes or missing underscores in file or function names.

Test files start with test_ and test functions start with test_. The function name here uses 'test' prefix without underscore because it's part of the function name.

5fill in blank

hard

Fill all three blanks to write a pytest test file and function with correct naming conventions and an assertion.

PyTest

File: [1]math_ops.py

def [2]_multiply():
    result = 3 * 3
    assert result [3] 9

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

Atest_

Btest

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong prefixes or wrong assertion operators.

The test file must start with test_. The test function must start with test_. The assertion checks equality with ==.

Practice

1. Which of the following is a correct name for a pytest test file?

easy

A. test_example.py

B. example_tested.py

C. example.py

D. mytestfile.py

Solution

1. Step 1: Understand pytest file naming rules

   Pytest requires test files to start with test_ or end with _test.py.

2. Step 2: Check each option against the rule

   test_example.py starts with test_, so it is correct. Options A, C, and D do not follow the naming convention.

3. Final Answer:

   test_example.py -> Option A

4. Quick Check:

   File starts with 'test_' = B [OK]

Hint: Test files start with 'test_' or end with '_test.py' [OK]

Common Mistakes:

• Naming file without 'test_' prefix or '_test.py' suffix
• Using generic file names without test indication
• Confusing test function naming with file naming

2. Which of the following is the correct way to name a pytest test function?

easy

A. login_test()

B. check_login()

C. test_login()

D. TestLogin()

Solution

1. Step 1: Recall pytest function naming rule

   Pytest requires test functions to start with test_ to be discovered automatically.

2. Step 2: Evaluate each function name

   Only test_login() starts with test_. Others do not follow the rule.

3. Final Answer:

   test_login() -> Option C

4. Quick Check:

   Function starts with 'test_' = A [OK]

Hint: Test functions must start with 'test_' [OK]

Common Mistakes:

• Omitting 'test_' prefix in function names
• Using camel case instead of snake case
• Confusing test file and function naming rules

3. Given the following test file named test_math.py with this code:

def add(a, b):
    return a + b

def test_add():
    assert add(2, 3) == 5

What will pytest do when run on this file?

medium

A. Run the test function and fail

B. Run the test function and pass

C. Skip the test function

D. Raise a syntax error

Solution

1. Step 1: Check file and function naming

   The file is named test_math.py and the function is named test_add, both following pytest conventions.

2. Step 2: Analyze test function behavior

   The test asserts add(2, 3) == 5, which is true, so the test will pass.

3. Final Answer:

   Run the test function and pass -> Option B

4. Quick Check:

   Correct naming + passing assertion = A [OK]

Hint: Correct names run tests; passing asserts pass tests [OK]

Common Mistakes:

• Misnaming test functions so pytest skips them
• Assuming test fails without checking assertion
• Confusing syntax errors with test failures

4. You have a test file named math_test.py with a function named add_test(). When running pytest, no tests are found. What is the most likely cause?

medium

A. The function name does not start with 'test_'

B. The file extension is incorrect

C. The file name does not start with 'test_'

D. The test function has no assert statement

Solution

1. Step 1: Check file naming

   The file math_test.py ends with _test.py, which is valid for pytest discovery.

2. Step 2: Check function naming

   The function is named add_test(), which does not start with test_. Pytest ignores such functions.

3. Final Answer:

   The function name does not start with 'test_' -> Option A

4. Quick Check:

   Function must start with 'test_' = C [OK]

Hint: Function names must start with 'test_' to be found [OK]

Common Mistakes:

• Assuming file name alone is enough
• Naming functions with '_test' suffix instead of prefix
• Forgetting to add assert statements

5. You want pytest to automatically discover and run tests in your project. Which combination of file and function names will ensure this?

• File: example_test.py
• Functions: test_case1(), case2_test(), test_case3()

Which functions will pytest run?

hard

A. None of the functions

B. Only case2_test()

C. All three functions

D. Only test_case1() and test_case3()

Solution

1. Step 1: Confirm file naming

   The file example_test.py ends with _test.py, so pytest will discover it.

2. Step 2: Check function naming rules

   Pytest runs functions starting with test_. So test_case1() and test_case3() will run. case2_test() will be ignored.

3. Final Answer:

   Only test_case1() and test_case3() -> Option D

4. Quick Check:

   Functions start with 'test_' run = D [OK]

Hint: File ends '_test.py'; functions start 'test_' to run [OK]

Common Mistakes:

• Thinking '_test' suffix in function name triggers test
• Assuming all functions in test files run automatically
• Confusing file and function naming rules