Branch coverage in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assert the function returns True for positive input.

PyTest

def is_positive(num):
    return num > 0

def test_positive():
    assert is_positive([1]) == True

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

A0

B-3

C5

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or negative numbers which return False.

The function returns True only if the input is greater than zero. Using 5 tests the positive branch.

2fill in blank

medium

Complete the test to check the function returns False for zero input.

PyTest

def is_positive(num):
    return num > 0

def test_zero():
    assert is_positive([1]) == False

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

A10

B0

C-1

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using positive numbers which return True.

The function returns False when the input is zero because zero is not greater than zero.

3fill in blank

hard

Fix the error in the test to cover the negative branch correctly.

PyTest

def is_positive(num):
    return num > 0

def test_negative():
    assert is_positive([1]) == False

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

A-2

B0

C5

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or positive numbers which do not test the negative branch.

Negative numbers like -2 cause the function to return False, covering the negative branch.

4fill in blank

hard

Fill both blanks to complete a test that covers both branches using pytest parametrize.

PyTest

import pytest

@pytest.mark.parametrize('input, expected', [
    ([1], True),
    ([2], False)
])
def test_is_positive(input, expected):
    assert is_positive(input) == expected

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

A10

B-5

C0

D7

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero which returns False but is not negative.

10 is positive and should return True; -5 is negative and should return False, covering both branches.

5fill in blank

hard

Fill all three blanks to create a test function that covers positive, zero, and negative inputs with correct assertions.

PyTest

import pytest

@pytest.mark.parametrize('num, expected', [
    ([1], True),
    ([2], False),
    ([3], False)
])
def test_branch_coverage(num, expected):
    assert is_positive(num) == expected

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

A3

B0

C-1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero as positive or negative.

5 is positive (True), 0 is zero (False), and -1 is negative (False), covering all branches.