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Testing Fundamentals

test arrange-act-assert unit test isolation integration test boundary end-to-end workflow test positive test case negative test case boundary value analysis equivalence partitioning

Assertions & Fixtures

equality assertion exception assertion fixture setup and teardown parameterized tests temporary filesystem fixture test data factory mock object spy interaction verification

Test Doubles & Dependencies

stub return value mock external API fake repository dependency injection for testing time control with fake clock randomness control HTTP client mocking database transaction rollback tests

Coverage & Quality

line coverage branch coverage mutation testing concept flaky test detection test naming conventions assertion message quality test pyramid risk-based testing

API & Web Testing

HTTP status assertions JSON body assertions authentication test validation error test idempotency test rate-limit test contract/schema test browser form submission test

Automation & CI

test command exit codes parallel test execution test retries caution CI test matrix test artifacts JUnit XML report smoke test stage regression test suite

Software Testing / Coverage & Quality

line coverage

Learn line coverage in Software Testing with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Intermediate

software-testing-025.py

python

# run: pytest --cov=app --cov-report=term-missing
def sign(x):
    if x >= 0: return 1
    return -1

def test_positive_line(): assert sign(2)==1

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

line coverage Mastery Check →

database transaction rollback tests

branch coverage