Question 1

How do I run Unity tests on a microcontroller?

Accepted Answer

Integrate Unity into your build system and write a main function that calls test suites; output results via serial or other I/O methods. You may need to handle memory constraints and toolchain specifics manually.

Question 2

Unity vs Catch2 for C testing?

Accepted Answer

Unity is lighter and focused on embedded C with bitwise and integer size support, while Catch2 is more feature-rich for C++ and hosted systems. Choose Unity for minimal footprint and embedded needs.

Question 3

Does Unity support test fixtures or setup/teardown?

Accepted Answer

Unity itself doesn't have built-in fixture support; you need to manage setup and teardown manually in your test functions, using patterns from the documentation or external helpers.

Question 4

How to mock functions in Unity tests?

Accepted Answer

Unity doesn't include mocking; use function pointers, linker tricks, or pair it with external libraries like CMock (also from ThrowTheSwitch) for stubbing dependencies.

Question 5

Can I use Unity with Ceedling?

Accepted Answer

Yes, Ceedling is a build tool from the same organization that automates test running, reporting, and integrates Unity, making setup easier for embedded projects.

Question 6

What's the difference between TEST_ASSERT_EQUAL_INT and TEST_ASSERT_EQUAL?

Accepted Answer

TEST_ASSERT_EQUAL is a shorthand for TEST_ASSERT_EQUAL_INT, which compares integers; use size-specific macros like INT8 for exact data type control, especially in embedded contexts with varied integer sizes.

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