Test suite organization in Testing Fundamentals - Build an Automation Script

Organize and run multiple test cases in a test suite

Preconditions (3)

Step 1: Create three test files: test_math.py, test_strings.py, test_lists.py

Step 2: In test_math.py, write a test function to check addition of two numbers

Step 3: In test_strings.py, write a test function to check string uppercase conversion

Step 4: In test_lists.py, write a test function to check list append operation

Step 5: Create a test suite file named test_suite.py that imports all three test files

Step 6: Run the test suite using pytest command

Step 7: Verify that all three tests run and pass

✅ Expected Result: All three tests run successfully and pass, showing a summary report with 3 passed tests

Automation Requirements - pytest

Assertions Needed:

Verify addition result equals expected value

Verify string uppercase conversion matches expected

Verify list append results in expected list length

Best Practices:

Use descriptive test function names

Keep tests independent and isolated

Organize tests logically by feature or functionality

Use pytest conventions for test discovery

Avoid hardcoding values inside tests; use variables

Automated Solution

Testing Fundamentals

import pytest

# test_math.py

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

# test_strings.py

def test_uppercase():
    text = "hello"
    assert text.upper() == "HELLO"

# test_lists.py

def test_append():
    items = [1, 2, 3]
    items.append(4)
    assert len(items) == 4

# test_suite.py

import test_math
import test_strings
import test_lists

if __name__ == "__main__":
    pytest.main()

The code defines three test functions, each in a separate section simulating separate files: test_math.py, test_strings.py, and test_lists.py. Each test checks a simple operation with an assertion.

The test_suite.py file imports these test modules and runs pytest to discover and execute all tests automatically.

This organization shows how to group related tests and run them together as a suite, following pytest conventions for easy test discovery and reporting.

Common Mistakes - 4 Pitfalls

{'mistake': 'Not using pytest naming conventions for test functions', 'why_bad': "Pytest will not discover tests that do not start with 'test_' automatically, so tests won't run.", 'correct_approach': "Always name test functions starting with 'test_' so pytest can find and run them."}

Putting multiple unrelated tests in one function

Hardcoding values inside tests without variables

Not isolating tests leading to shared state

Bonus Challenge

Now add data-driven testing with 3 different inputs for the addition test

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