Test functions in PyTest - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of a simple pytest test function

What is the test result when running this pytest test function?

PyTest

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

A SyntaxError due to missing colon

B Test fails with AssertionError

C Test passes with no errors

D TypeError because of wrong assertion

💡 Hint

Check if the assertion condition is true.

The assertion 2 + 3 == 5 is true, so the test passes without errors.

❓ assertion

intermediate

Identify the failing assertion in pytest

Which assertion will cause the pytest test to fail?

PyTest

def test_values():
    assert 10 > 5
    assert 'a' == 'b'
    assert [1, 2] == [1, 2]

A assert 'a' == 'b'

B assert [1, 2] == [1, 2]

C assert 10 > 5

D All assertions pass

💡 Hint

Check which condition is false.

The assertion 'a' == 'b' is false, so pytest will fail at this line.

🔧 Debug

advanced

Find the error in this pytest test function

What error will pytest report when running this test function?

PyTest

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

A ZeroDivisionError at runtime

B Test passes successfully

C SyntaxError due to missing colon

D AssertionError because result is not 0

💡 Hint

Consider what happens when dividing by zero in Python.

Dividing by zero raises a ZeroDivisionError before the assertion runs.

❓ framework

advanced

pytest test discovery rules

Which function name will pytest automatically discover as a test?

A def example_test():

B def test_example():

C def check_test():

D def example():

💡 Hint

pytest looks for functions starting with a specific prefix.

pytest discovers functions starting with test_ as tests.

🧠 Conceptual

expert

Effect of multiple assertions in one pytest test function

What happens when multiple assertions exist in one pytest test function and the first assertion fails?

A pytest retries the test automatically on failure

B All assertions run; all failures are reported together

C Test passes if any assertion passes

D Test stops at first failed assertion; later assertions are not checked

💡 Hint

Think about how Python handles exceptions during test execution.

When an assertion fails, it raises an exception stopping the test function immediately.