GTEST from ignorance to proficiency (4) how to write unit tests with GTEST

1 gtest What is it?

gtest yes Google Developed a cross platform open source unit testing framework ,git Warehouse click here to get . Mainly aimed at c/c++,gtest It has the following characteristics ：

• The test framework

• Automatically collect test cases , No need for developers to organize again

• Provides a powerful set of assertions , Support includes Boolean 、 integer 、 floating-point 、 String, etc.

• Provides custom extensions for assertion methods

• Provide death test function

• Common use case initialization and cleaning can be put into the test fixture , from gtest Automatically call

• Value-parameterized tests.

• Type-parameterized tests.

• Generate xml Format test report

2. Define a basic test case

TEST Macros are used to define a test case ：

#include <gtest/gtest.h> 

int Add(int i