Testable by Design - How to Create Testable C++ Code Using C++ Language Features
summary
Builds a small heating controller (timer + thermostat + override activator) that composes an abstract heating activator API, uses fake implementations and Google Test to verify behaviors, and keeps time as std::chrono durations wrapped in a time window helper. Uses C++20 concepts (invocable) and CTAD, prefers shared_ptr for simple lifetime management, provides a factory for template activators, measures std::function vs templated callables and reports ~50% speed gain for templates, and shows examples compile with GCC/Clang/MSVC.
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chapters (10)
- 0:00Testable C++ design intro
- 5:27Heating controller system design
- 10:10Uncertainty in third-party APIs
- 15:09Controller with dependency injection
- 21:12Refactoring for testability
- 25:05Thermostat temperature separation
- 32:12Timer and override activators
- 38:52Manual override functionality
- 43:35Design principles summary
- 45:22Q&A
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