Why assert is PyTest's core mechanism - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to write a simple test that checks if 2 + 2 equals 4 using assert.

PyTest

def test_sum():
    assert 2 + 2 [1] 4

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

A=

B==

C!=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using single = instead of == causes syntax error.

Using != will fail the test.

The assert statement checks if the expression is True. Here, 2 + 2 == 4 must be True for the test to pass.

2fill in blank

medium

Complete the code to assert that a list contains the number 5.

PyTest

def test_contains():
    numbers = [1, 3, 5, 7]
    assert [1] in numbers

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

A5

B6

C4

D7

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a number not in the list causes test failure.

The assert checks if 5 is in the list numbers. This must be True for the test to pass.

3fill in blank

hard

Fix the error in the assert statement to correctly check if the string 'hello' starts with 'h'.

PyTest

def test_startswith():
    word = 'hello'
    assert word.[1]('h')

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

Astartswith

Bstartwith

Cstarts_with

Dbeginwith

Attempts:

3 left

💡 Hint

Common Mistakes

Misspelling the method name causes AttributeError.

The correct method name is startswith. It returns True if the string starts with the given substring.

4fill in blank

hard

Fill both blanks to create a test that asserts the length of the list is greater than 3.

PyTest

def test_length():
    items = [1, 2, 3, 4, 5]
    assert len(items) [1] [2]

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

A>

B3

C5

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > causes test failure.

Using wrong number causes wrong assertion.

The test checks if the length of items is greater than 3. So the operator is > and the number is 3.

5fill in blank

hard

Fill all three blanks to create a test that asserts a dictionary has a key 'name' and its value is 'Alice'.

PyTest

def test_dict():
    person = {'name': 'Alice', 'age': 30}
    assert '[1]' in person and person['[2]'] [3] 'Alice'

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

Aname

Bage

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong key name causes test failure.

Using != operator causes test failure.

The test checks if the key 'name' exists in the dictionary and if its value equals 'Alice'.