Deterministic tests in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to make the test deterministic by fixing the seed.

PyTest

import random

def test_random_number():
    random.seed([1])
    num = random.randint(1, 10)
    assert num == 7

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

A0

Brandom

C42

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using random.seed(None) which makes the test non-deterministic.

Setting the seed to a fixed number like 42 makes the random number generation deterministic.

2fill in blank

medium

Complete the code to ensure the test always checks the same output from a function using a fixed seed.

PyTest

import random

def get_random_choice():
    random.seed([1])
    return random.choice(['apple', 'banana', 'cherry'])

def test_choice():
    assert get_random_choice() == 'banana'

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

A42

B100

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Not setting the seed inside the function, causing different outputs.

Using seed 42 ensures the choice is always 'banana' for this test.

3fill in blank

hard

Fix the error in the test to make it deterministic by setting the seed correctly.

PyTest

import random

def test_sum():
    random.seed([1])
    values = [random.randint(1, 5) for _ in range(3)]
    assert sum(values) == 7

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

Arandom

B42

C'seed'

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using None or a string as seed, which does not fix randomness.

Setting the seed to 42 ensures the random values are the same every time, making the sum predictable.

4fill in blank

hard

Fill both blanks to create a deterministic test that filters even numbers from a random list.

PyTest

import random

def test_even_numbers():
    random.seed([1])
    numbers = [random.randint(1, 10) for _ in range(5)]
    evens = [num for num in numbers if num [2] 2 == 0]
    assert evens == [4, 10]

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

A123

B!=

C%

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '%' causes wrong filtering.

Seed 123 fixes the random numbers. Using '%' checks for even numbers correctly.

5fill in blank

hard

Fill all three blanks to create a deterministic test that maps uppercase keys to values greater than 5.

PyTest

import random

def test_filtered_dict():
    random.seed([1])
    data = {chr(97 + i): random.randint(1, 10) for i in range(4)}
    filtered = {k[2]: v for k, v in data.items() if v [3] 5}
    assert filtered == {'A': 7, 'D': 6}

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

A7

B>

C.upper()

D42

Attempts:

3 left

💡 Hint

Common Mistakes

Not converting keys to uppercase or using wrong comparison operator.

Seed 42 fixes random values. Using .upper() converts keys to uppercase. '>' filters values greater than 5.