CPP Unit Testing & Code Quality 2

Question 1

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

Accepted Answer

EXPECT_FLOAT_EQ

Answer

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.

Question 2

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

Accepted Answer

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

Answer

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.

Question 3

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

Accepted Answer

modernize-*

Answer

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

Question 4

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

Accepted Answer

Write failing test → make it pass → refactor

Answer

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).

Question 5

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

Accepted Answer

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

Answer

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

(CPP) C++ Programming Professional Certificate Practice Test

(CPP) C++ Programming Professional Certificate Practice Test

CPP Unit Testing & Code Quality 2