Parametrize with IDs in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to parametrize a test with two values.

PyTest

import pytest

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

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

A[1, 2]

B(1, 2)

C{1, 2}

D'1, 2'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a list or tuple.

Using a set which is unordered and not recommended here.

The @pytest.mark.parametrize decorator expects an iterable like a list or tuple. Using a list [1, 2] correctly passes the values.

2fill in blank

medium

Complete the code to parametrize a test with two arguments and IDs.

PyTest

import pytest

@pytest.mark.parametrize(
    'input,expected',
    [(2, 4), (3, 9)],
    ids=[1]
)
def test_square(input, expected):
    assert input ** 2 == expected

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

A['two', 'three']

B['2', '3']

C['square2', 'square3']

D['input2', 'input3']

Attempts:

3 left

💡 Hint

Common Mistakes

Using numbers instead of strings for IDs.

Using IDs list length different from test cases.

The ids parameter takes a list of strings to name each test case. Using ['two', 'three'] clearly identifies the test cases.

3fill in blank

hard

Fix the error in the parametrize decorator by completing the IDs argument correctly.

PyTest

import pytest

@pytest.mark.parametrize(
    'value',
    [10, 20, 30],
    ids=[1]
)
def test_greater_than_five(value):
    assert value > 5

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

A['10', '20']

B['10', '20', 30]

C['ten', 'twenty', 'thirty', 'forty']

D['10', '20', '30']

Attempts:

3 left

💡 Hint

Common Mistakes

Providing fewer or more IDs than test cases.

Mixing string and integer types in IDs.

The ids list must have the same number of elements as the test data. Here, three values require three ID strings.

4fill in blank

hard

Fill both blanks to parametrize a test with multiple arguments and custom IDs.

PyTest

import pytest

@pytest.mark.parametrize(
    [1],
    [(1, 'a'), (2, 'b')],
    ids=[2]
)
def test_multiple_args(num, char):
    assert isinstance(num, int) and isinstance(char, str)

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

A'num, char'

B'number, letter'

C['case1', 'case2']

D['first', 'second']

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list instead of a string for argument names.

Mismatch between number of IDs and test cases.

The first blank is the string of argument names separated by commas. The second blank is a list of ID strings matching the test cases.

5fill in blank

hard

Fill all three blanks to parametrize a test with three arguments, test data, and custom IDs.

PyTest

import pytest

@pytest.mark.parametrize(
    [1],
    [2],
    ids=[3]
)
def test_three_args(x, y, z):
    assert x < y < z

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

A'x, y, z'

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

C['first', 'second']

D['a', 'b']

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect data types for arguments or test data.

Mismatch in length between test data and IDs.

The first blank is the string of argument names. The second blank is the list of tuples with test data. The third blank is the list of ID strings for each test case.