cpp-unit-testing

C++ unit tests for embedded automotive software require isolating hardware and OS dependencies using Google Test and Google Mock. Structure tests with Arrange-Act-Assert and define test doubles for hard-to-isolate interfaces to ensure reproducible verification.

Mocking HAL and OS dependencies using gmock involves building test doubles with StrictMock or NiceMock. This approach applies expectation-driven verification to isolate production code from hardware and operating system services during C++ unit testing.

Integrating gtest with CMake for parameterized tests and code coverage requires configuring CMake test discovery and coverage workflows. This setup supports parameterized tests, death tests, and validates coverage targets for gtest-based projects.

This gtest workflow supports embedded targets including QNX and Android NDK. It applies to Google Test and Google Mock workflows for IVI, HUD, RSE, and Linux environments, ensuring tests remain fast and maintainable across platforms.

Using the Arrange-Act-Assert structure for C++ unit testing keeps tests readable and maintainable. This structure separates setup, execution, and verification, ensuring deterministic isolation and clear naming for gtest-based projects.

You can use gmock to characterize legacy C++ behavior before refactoring by building test doubles for dependencies and applying expectation-driven verification. This approach captures existing functionality and validates coverage targets safely.