Test naming conventions in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to name the test function correctly so pytest recognizes it.

PyTest

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

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

Acheck_add

Baddition_test

Ctest_addition

DAddTest

Attempts:

3 left

💡 Hint

Common Mistakes

Naming test functions without 'test_' prefix

Using camel case instead of snake case

Pytest recognizes test functions that start with test_. So test_addition is correct.

2fill in blank

medium

Complete the code to name the test class correctly so pytest recognizes it.

PyTest

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

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

ATestExample

BTestsExample

Cexample_test

DExampleTests

Attempts:

3 left

💡 Hint

Common Mistakes

Not starting class name with 'Test'

Using snake_case for class names

Pytest recognizes test classes that start with Test and use PascalCase. So TestExample is correct.

3fill in blank

hard

Fix the error in the test function name so pytest will run it.

PyTest

def [1]():
    assert 'hello'.upper() == 'HELLO'

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

Acheck_uppercase

Btest_uppercase

CuppercaseTest

Dverify_upper

Attempts:

3 left

💡 Hint

Common Mistakes

Missing 'test_' prefix

Using camelCase instead of snake_case

Only functions starting with test_ are run by pytest automatically. test_uppercase is correct.

4fill in blank

hard

Fill both blanks to correctly name the test function and parameter for pytest.

PyTest

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

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

Atest_double

Binput_value

Cvalue

Ddouble_test

Attempts:

3 left

💡 Hint

Common Mistakes

Function name missing 'test_' prefix

Using invalid or unclear parameter names

The test function must start with test_, so test_double is correct. The parameter name can be any valid identifier; input_value is clear and descriptive.

5fill in blank

hard

Fill all three blanks to correctly name the test class, test method, and parameter for pytest.

PyTest

class [1]:
    def [2](self, [3]):
        assert [3] + 1 == 3

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

ATestMath

Btest_increment

Cnumber

DMathTest

Attempts:

3 left

💡 Hint

Common Mistakes

Class name not starting with 'Test'

Method name missing 'test_' prefix

Unclear parameter names

The test class should start with Test, so TestMath is correct. The test method must start with test_, so test_increment is correct. The parameter number is a clear variable name.

Practice

1. Which of the following is the correct way to name a test function in pytest so it is automatically discovered?

easy

A. test_login_functionality

B. check_login_functionality

C. LoginTest

D. verifyLogin

Solution

1. Step 1: Understand pytest test discovery rules

   pytest automatically finds test functions that start with test_.

2. Step 2: Check each option against the rule

   Only test_login_functionality starts with test_, so pytest will find it automatically.

3. Final Answer:

   test_login_functionality -> Option A

4. Quick Check:

   Test names start with test_ = C [OK]

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

Common Mistakes:

• Not starting test names with test_
• Using camelCase instead of snake_case
• Using class names instead of functions

2. Which of the following test function names is syntactically correct in pytest?

easy

A. test-user-login

B. test-UserLogin

C. test_user_login

D. test user login

Solution

1. Step 1: Identify valid Python function names

   Function names must use letters, numbers, and underscores only; no spaces or hyphens.

2. Step 2: Check each option

   test_user_login uses underscores and is valid; others use hyphens, spaces which are invalid.

3. Final Answer:

   test_user_login -> Option C

4. Quick Check:

   Underscores allowed in function names = D [OK]

Hint: Use underscores, no spaces or hyphens in test names [OK]

Common Mistakes:

• Using hyphens in function names
• Including spaces in test names
• Using camelCase instead of snake_case

3. Given the following pytest code, which test functions will pytest discover and run?

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

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

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

class TestDivision:
    def test_divide(self):
        assert 6 / 2 == 3

medium

A. test_addition and test_divide only

B. All four functions

C. test_addition, testMultiplication, and test_divide

D. test_addition only

Solution

1. Step 1: Identify pytest discovery rules for functions and methods

   pytest finds functions starting with test_ and methods inside classes named Test* starting with test_.

2. Step 2: Analyze each function/method

   test_addition is found; check_subtraction is ignored; testMultiplication is ignored due to camelCase; test_divide inside TestDivision class is found.

3. Final Answer:

   test_addition and test_divide only -> Option A

4. Quick Check:

   Functions/methods start with test_ = A [OK]

Hint: pytest finds test_ functions and test_ methods in Test* classes [OK]

Common Mistakes:

• Assuming camelCase test names are found
• Ignoring test methods inside Test classes
• Thinking all functions are discovered

4. You wrote a test function named Test_login but pytest does not run it. What is the most likely reason?

medium

A. Function is inside a class without Test prefix

B. Function name contains uppercase letters

C. Function is missing parentheses

D. Function name does not start with lowercase test_

Solution

1. Step 1: Recall pytest naming rules for functions

   pytest requires test functions to start with lowercase test_ exactly.

2. Step 2: Analyze the function name Test_login

   It starts with uppercase T, so pytest ignores it.

3. Final Answer:

   Function name does not start with lowercase test_ -> Option D

4. Quick Check:

   Lowercase test_ prefix required = A [OK]

Hint: Test function names must start with lowercase test_ [OK]

Common Mistakes:

• Using uppercase T in test function names
• Assuming pytest finds any function with 'test' inside
• Ignoring function naming case sensitivity

5. You want to write clear pytest test names that describe what they check. Which of the following is the best test function name for checking if a user can log in with valid credentials?

hard

A. test1

B. test_valid_user_login

C. test_login

D. test_user_login_with_valid_credentials_and_session_creation

Solution

1. Step 1: Consider clarity and brevity in test names

   Good test names are clear but not overly long or vague.

2. Step 2: Evaluate each option

   test_valid_user_login clearly states the test purpose concisely. test1 is vague. test_login is too general. test_user_login_with_valid_credentials_and_session_creation is too long and hard to read.

3. Final Answer:

   test_valid_user_login -> Option B

4. Quick Check:

   Clear and concise descriptive names = B [OK]

Hint: Choose clear, concise test names describing the check [OK]

Common Mistakes:

• Using vague or generic names like test1
• Writing overly long test names
• Using names that don't describe the test purpose