First PyTest test - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this simple PyTest test?

Consider this PyTest test function. What will be the test result when you run it?

PyTest

def test_sum():
    assert 2 + 3 == 5

A Test fails with AssertionError

B Test passes successfully

C SyntaxError occurs due to missing colon

D RuntimeError due to undefined variable

💡 Hint

Check if the assertion condition is true or false.

The assertion 2 + 3 == 5 is true, so the test passes.

❓ assertion

intermediate

Which assertion will correctly check if a list contains exactly 3 items?

You want to write a PyTest assertion to verify that the list items = [1, 2, 3] has exactly 3 elements. Which option is correct?

A assert len(items) == 3

B assert items.count == 3

C assert items.length() == 3

D assert items.size == 3

💡 Hint

Use the built-in function to get the number of elements in a list.

The len() function returns the number of items in a list. The other options are invalid syntax or attributes.

🔧 Debug

advanced

Why does this PyTest test fail?

Look at this test code and find why it fails when run with PyTest.

PyTest

def test_divide():
    result = 10 / 0
    assert result == 0

A SyntaxError due to missing colon

B AssertionError because result is not zero

C ZeroDivisionError occurs before assertion

D Test passes because 10 divided by 0 is 0

💡 Hint

What happens when you divide by zero in Python?

Dividing by zero raises a ZeroDivisionError before the assertion runs, causing the test to error out.

❓ framework

advanced

Which PyTest feature allows running setup code before each test function?

You want to run some code before every test function in a file. Which PyTest feature should you use?

A Use a main() function to call setup manually

B Use a class with __init__ method for setup

C Use a global variable initialized outside tests

D Use a fixture with scope='function' and the @pytest.fixture decorator

💡 Hint

PyTest fixtures are designed for setup and teardown.

Fixtures with function scope run setup code before each test function automatically.

🧠 Conceptual

expert

What is the main advantage of using PyTest over basic assert statements in scripts?

Why do testers prefer PyTest framework instead of just writing assert statements in Python scripts?

A PyTest provides detailed test reports, fixtures, and easy test discovery

B PyTest runs code faster than plain Python scripts

C PyTest automatically fixes bugs in the code

D PyTest requires no installation and works out of the box

💡 Hint

Think about what features a testing framework adds beyond simple asserts.

PyTest offers features like detailed reports, setup/teardown fixtures, and automatic test discovery, which plain asserts do not provide.