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Unit Testing & Code Quality Flashcards

7 cards from real CPP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In Google Test, which macro should you use to verify that two floating-point values are approximately equal within a default tolerance?

    Answer: EXPECT_FLOAT_EQ

    EXPECT_FLOAT_EQ checks that two float values are within 4 ULPs of each other, which is the standard way to compare floats in GTest.

  2. What is a 'test fixture' in the context of C++ unit testing frameworks like Google Test?

    Answer: A class that provides shared setup and teardown logic for a group of tests

    A test fixture is a class (often inheriting from ::testing::Test) that encapsulates shared state and setup/teardown methods reused across multiple related test cases.

  3. Which clang-tidy check category specifically targets potential C++ modernization opportunities such as replacing loops with range-based for?

    Answer: modernize-*

    The modernize-* checks in clang-tidy suggest transformations that move code toward modern C++ idioms like range-based for, nullptr, and override.

  4. In test-driven development (TDD), what is the correct order of the 'Red-Green-Refactor' cycle?

    Answer: Write failing test → make it pass → refactor

    TDD's Red-Green-Refactor cycle starts with a failing test (Red), then writes minimal code to pass it (Green), then cleans up the code (Refactor).

  5. What does the AddressSanitizer (ASan) tool primarily detect in C++ programs?

    Answer: Memory safety errors such as buffer overflows and use-after-free

    AddressSanitizer instruments the binary at compile time to detect memory errors including heap/stack buffer overflows, use-after-free, and use-after-return.

  6. Which of the following is the best practice when naming unit test functions in Google Test using TEST_F?

    Answer: TestSuiteName_TestName (underscore-separated descriptive names)

    Google Test uses TEST_F(TestSuiteName, TestName) where both parts are PascalCase or descriptive identifiers separated by an underscore at the macro level.

  7. What is 'code coverage' as measured by tools like gcov or llvm-cov?

    Answer: The percentage of source lines or branches executed during test runs

    Code coverage measures what fraction of executable lines, branches, or functions are actually exercised when the test suite runs.

Unit Testing & Code Quality Flashcards — CPP Study Cards with Answers