Why parametrize multiplies test coverage in PyTest - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to parametrize the test with two values.

PyTest

import pytest

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

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

A{1, 2}

B1, 2

C(1, 2)

D[1, 2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or braces instead of square brackets.

The parameter list must be a list, so use [1, 2].

2fill in blank

medium

Complete the code to parametrize the test with two arguments: input and expected.

PyTest

import pytest

@pytest.mark.parametrize('[1]', [(1, 2), (3, 4)])
def test_sum(input, expected):
    assert input + 1 == expected

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

A'input expected'

B'input; expected'

C'input, expected'

D'input|expected'

Attempts:

3 left

💡 Hint

Common Mistakes

Using spaces or other separators instead of commas.

Multiple parameters must be given as a comma-separated string.

3fill in blank

hard

Fix the error in the parametrize decorator to correctly test multiple cases.

PyTest

import pytest

@pytest.mark.parametrize('num, expected', [1])
def test_double(num, expected):
    assert num * 2 == expected

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

A[1, 2, 3]

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

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

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

Attempts:

3 left

💡 Hint

Common Mistakes

Using single values instead of tuples.

Tuples with wrong number of elements.

The parameter list must be a list of tuples with two values each.

4fill in blank

hard

Fill both blanks to parametrize a test with three parameters and three sets of values.

PyTest

import pytest

@pytest.mark.parametrize('[1]', [2])
def test_calc(a, b, c):
    assert a + b == c

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

A'a, b, c'

B'a b c'

C[(1, 2, 3), (4, 5, 9), (3, 3, 6)]

D[(1, 2), (4, 5), (3, 3)]

Attempts:

3 left

💡 Hint

Common Mistakes

Using space-separated parameter names.

Tuples with wrong number of elements.

Parameter names must be comma-separated string and values a list of tuples with three elements.

5fill in blank

hard

Fill all three blanks to parametrize a test with two parameters and check if the sum is even.

PyTest

import pytest

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

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

A'x, y'

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

C% 2 ==

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter string format.

Incorrect assertion operator.

Parameters are 'x, y', values are list of tuples, and the assertion checks if sum modulo 2 equals 0.