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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

mutation testing concept

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

12 min read • Intermediate

software-testing-027.py

python

# mutation tool may change >= to >; this test catches the boundary mutation
def eligible(score): return score >= 50
def test_exact_boundary_kills_mutant(): assert eligible(50) is True

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

mutation testing concept Mastery Check →

branch coverage

flaky test detection