How to use Catch2 to debug C++ unit tests?

Catch2 can be used in C++ unit tests in the following ways: Installation: Use CMake or add the Catch2 folder directly to the project. Writing tests: Use the TEST_CASE macro to define test cases and the REQUIRE macro for assertions. Debug tests: Connect a debugger, set breakpoints, and debug using the assertion information provided by Catch2. Practical example: Create a Calculator class and write a unit test case to test its add method.

#How to use Catch2 in C++ unit tests?

Catch2 is an assertion-based and extremely flexible C++ unit testing framework. It provides a more friendly and concise syntax compared to other C++ unit testing frameworks. This article will guide you on how to use Catch2 to debug C++ unit tests.

Install Catch2

You can install Catch2 through CMake or directly add the Catch2 folder to your project:

# 使用 CMake
find_package(Catch2 REQUIRED)

# 复制 Catch2 文件夹
将 Catch2 文件夹复制到项目中，并包含 `Catch2/catch.hpp` 头文件。

Written Unit test

Writing unit tests using Catch2 is very simple, for example:

#include <catch2/catch.hpp>

TEST_CASE("检查数字是否为偶数") {
    REQUIRE(2 % 2 == 0);
}

Here, the TEST_CASE macro defines a test case, REQUIRE Macro is used to assert that the return result of the function is true.

Debug Unit Tests

Catch2 allows you to debug unit tests using breakpoints and the debugger. Use your debugger to connect to the test program and debug the test case from breakpoints. Catch2 provides rich assertion information that can be easily viewed in the debugger.

Practical case

Requirements: Write a class named Calculator, which contains a method to calculate the sum of two numbers The add method.

Code:

// Calculator.hpp
class Calculator {
public:
    int add(int a, int b) { return a + b; }
};

// Calculator.cpp
#include "Calculator.hpp"

// 单元测试
#include <catch2/catch.hpp>

TEST_CASE("Calculator 的加法功能") {
    Calculator calculator;
    REQUIRE(calculator.add(2, 3) == 5);
}

Run unit test

Use Catch2’s command line tool (catch2 ) Run the unit test:

catch2 Calculator.cpp

Debug the unit test

1. Set a breakpoint in the Calculator.add method.
2. Run unit tests in the terminal.
3. When the breakpoint of calculator.add(2, 3) is encountered, the debugger will pause execution.
4. From the debugger, you can inspect variable values, step through code and diagnose problems.

By using Catch2’s debugging capabilities, you can easily identify and fix errors in your unit tests.

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