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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

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API & Web Testing

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Software Testing / Test Doubles & Dependencies

time control with fake clock

Learn time control with fake clock in Software Testing with a dedicated explanation, a concept-specific example, practical cautions, and a mastery check.

12 min read • Intermediate

software-testing-021.py

python

from datetime import datetime
class Clock:
    def now(self): return datetime(2026,1,1,9,0,0)
def greeting(clock): return 'morning' if clock.now().hour<12 else 'later'
assert greeting(Clock())=='morning'

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Lesson quizzes

time control with fake clock Mastery Check →

dependency injection for testing

randomness control