Testing Fundamentalstesting~15 mins

Parallel test execution in Testing Fundamentals - Build an Automation Script

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Run two simple tests in parallel and verify both pass

Preconditions (2)

Step 1: Create two test functions: test_addition and test_subtraction

Step 2: In test_addition, assert that 2 + 3 equals 5

Step 3: In test_subtraction, assert that 5 - 3 equals 2

Step 4: Run both tests in parallel using pytest with the -n 2 option

✅ Expected Result: Both tests run at the same time and pass successfully

Automation Requirements - pytest with pytest-xdist

Assertions Needed:

Assert 2 + 3 == 5 in test_addition

Assert 5 - 3 == 2 in test_subtraction

Best Practices:

Use pytest fixtures if needed for setup

Use pytest-xdist for parallel execution

Keep tests independent to avoid interference

Use clear and simple assertions

Automated Solution

Testing Fundamentals

import pytest


def test_addition():
    assert 2 + 3 == 5


def test_subtraction():
    assert 5 - 3 == 2

# To run these tests in parallel, use the command:
# pytest -n 2

This script defines two simple test functions using pytest. Each test checks a basic math operation with an assertion.

We use pytest -n 2 to run both tests at the same time in parallel using the pytest-xdist plugin.

This approach helps speed up test execution by running tests concurrently. The tests are independent, so they do not affect each other.

Common Mistakes - 3 Pitfalls

{'mistake': 'Running tests sequentially without using pytest-xdist', 'why_bad': 'Tests run one after another, so no speed benefit from parallel execution.', 'correct_approach': "Install pytest-xdist and run tests with 'pytest -n 2' to enable parallel execution."}