@pytest.mark.parametrize decorator - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to parametrize the test function with two values for x.

PyTest

import pytest

@pytest.mark.parametrize('x', [[1]])
def test_example(x):
    assert x > 0

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

A1 2

B1, 2

C(1, 2)

D'1, 2'

Attempts:

3 left

💡 Hint

Common Mistakes

Using space instead of comma to separate values

Passing a tuple instead of a list

Passing a string instead of a list

The @pytest.mark.parametrize decorator expects a list of values. Using 1, 2 inside the list creates two values to test.

2fill in blank

medium

Complete the code to parametrize the test function with two parameters: x and y.

PyTest

import pytest

@pytest.mark.parametrize([1], [(1, 2), (3, 4)])
def test_sum(x, y):
    assert x + y > 0

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

A'(x, y)'

B['x', 'y']

C'x, y'

D('x', 'y')

Attempts:

3 left

💡 Hint

Common Mistakes

Passing parameter names as a list instead of a string

Using parentheses instead of quotes

Including spaces inside the string incorrectly

The parameter names must be passed as a single string with names separated by commas inside @pytest.mark.parametrize.

3fill in blank

hard

Fix the error in the parametrize decorator to correctly test multiple sets of inputs.

PyTest

import pytest

@pytest.mark.parametrize('x, y', [1])
def test_multiply(x, y):
    assert x * y >= 0

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

A[(1, 2), (3,)]

B[1, 2, 3, 4]

C[(1, 2), 3, 4]

D[(1, 2), (3, 4)]

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a flat list instead of list of tuples

Tuples with missing elements

Mixing tuples and single values

The values must be a list of tuples, each tuple matching the parameters. Option D correctly provides two tuples.

4fill in blank

hard

Fill both blanks to parametrize the test with three sets of inputs and check the sum.

PyTest

import pytest

@pytest.mark.parametrize([1], [2])
def test_sum(x, y):
    assert x + y == 3

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

A'x, y'

B[(1, 2), (2, 1), (0, 3)]

C[(1, 2), (2, 2), (0, 3)]

D'x,y'

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter string format

Using tuples with wrong sums

Using lists instead of tuples for values

The parameter names must be a string with comma-separated names (option A). The values must be a list of tuples matching the parameters (option B).

5fill in blank

hard

Fill all three blanks to parametrize the test with parameters a, b and expected, and check the multiplication result.

PyTest

import pytest

@pytest.mark.parametrize([1], [2])
def test_multiply(a, b, expected):
    assert a * b == [3]

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

A'a, b, expected'

B[(2, 3, 6), (4, 5, 20), (1, 0, 0)]

Cexpected

D'a, b'

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching parameter names and values

Using wrong variable in assertion

Incorrect tuple lengths in values

The parameter names are a string with three names (option A). The values are a list of tuples with three elements each (option B). The assertion compares the product to the expected value (option C).