Combining multiple parametrize decorators in PyTest - Test Execution Trace

Test Overview

This test uses two @pytest.mark.parametrize decorators to run a function with all combinations of two sets of inputs. It verifies the sum of two numbers equals the expected result.

Test Code - pytest

PyTest

import pytest

@pytest.mark.parametrize('a', [1, 2])
@pytest.mark.parametrize('b', [10, 20])
def test_sum(a, b):
    result = a + b
    assert result == a + b  # simple check to confirm sum calculation

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts	pytest test runner initialized	-	PASS
2	pytest collects test_sum with parameters a=[1,2] and b=[10,20]	Test cases generated for all combinations: (a=1,b=10), (a=1,b=20), (a=2,b=10), (a=2,b=20)	-	PASS
3	Test case runs with a=1, b=10	Function test_sum called with a=1, b=10	Assert result == 11	PASS
4	Test case runs with a=1, b=20	Function test_sum called with a=1, b=20	Assert result == 21	PASS
5	Test case runs with a=2, b=10	Function test_sum called with a=2, b=10	Assert result == 12	PASS
6	Test case runs with a=2, b=20	Function test_sum called with a=2, b=20	Assert result == 22	PASS
7	All test cases completed	All combinations tested successfully	-	PASS

Failure Scenario

Failing Condition: Assertion fails if the sum calculation is incorrect

Execution Trace Quiz - 3 Questions

How many total test cases are run with two parametrize decorators each having 2 values?

A 2

B 4

C 1

D 8

Key Result

Using multiple parametrize decorators runs tests for all combinations of parameters, helping check many input cases efficiently.