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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.

Read the first 7 Unit Testing & Code Quality flashcards as text

  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.