Automation strategy for C++ function unit testing?

Automation strategy for C function unit testing: Use frameworks: Frameworks such as Google Test and Catch2 simplify test writing and execution. Isolate code: Ensure that functions are independent of other code parts for easy testing. Mocks and Stubs: Mock the behavior of functions or dependencies for unit testing. Script or CI tool: Run tests automatically, check results, and reduce maintenance costs.

C Automation strategy for function unit testing

Introduction

Function unit testing is used to verify the correctness of the code and reliability are crucial. Manual testing is time-consuming and error-prone, and automation is crucial, especially when projects are larger.

Strategy

The following are some automation strategies for C function unit testing:

Use a framework

Unit testing frameworks such as Google Test, Catch2, and Boost.Test provide various tools to simplify test writing and execution.

Example:

#include <gtest/gtest.h>

TEST(MyFunctionTests, TestAddition) {
  int a = 5;
  int b = 10;
  EXPECT_EQ(add(a, b), 15);
}

Isolate code

Isolate code for functional unit tests to ensure they are independent from other parts of code.

Example:

class MyClass {
public:
  int add(int a, int b) {
    return a + b;
  }
};

TEST(MyClassTests, TestAdd) {
  MyClass obj;
  EXPECT_EQ(obj.add(5, 10), 15);
}

Mock and Stub

Use Mock and Stub objects to simulate the behavior of functions or external dependencies .

Example:

class MyDependency {
public:
  virtual int get() { return 0; }
};

class MyFunctionTests {
public:
  MyFunctionTests() {
    mock_dependency.reset(new MyDependencyMock());
  }

  int test() {
    return my_function(mock_dependency);
  }

private:
  std::unique_ptr<MyDependencyMock> mock_dependency;
};

TEST(MyFunctionTests, TestDependency) {
  EXPECT_CALL(mock_dependency, get()).Times(1).WillOnce(Return(10));
  MyFunctionTests tests;
  EXPECT_EQ(tests.test(), 10);
}

Use a script or CI tool

Example:

#!/bin/bash

# 运行单元测试
./build/bin/单元测试

# 检查测试结果
grep -q "ALL TESTS PASSED" ./build/单元测试.out || exit 1

Practical Case

In a large C project, the Google Test framework and scripts were used to automate function unit testing. Every time the code changes, tests are automatically triggered to ensure the function still works as expected. This significantly reduces maintenance costs and improves code quality.

By following these strategies, you can effectively automate C function unit testing and improve the reliability and maintainability of your code.

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