本文介绍如何在IntelliJ IDE中使用JUnit进行单元测试，并展示如何计算测试覆盖率。首先创建Java程序及Triangle类，实现三角形类型的判断。接着引入JUnit和Hamcrest依赖，创建测试文件夹并配置为测试资源根目录。通过快捷键生成测试类，编写测试方法验证Triangle类的功能。最后运行测试并查看覆盖率报告。
My pages will tell you how to use unit test and test coverage in IntteliJ.
1.At first we need to create a java program.
2.create a class named Triangle and then right a method to
calculates whether the triangle is equilateral, isosceles, or scalene.
3.add the junit and hamcrest jar package to the program
the intelliJ has the package in it lib
4. create a floder named TestTriangle and add root as a Test Sources Root
5. choose the Triangle class in editer,and use ctrl+shift+T to crate a test class
6.write the test method to test the method in Triangle class.
7.to run the test we can click right point and choose Run"TriangleTest" or point Run
this is the result of the test
if we want to change run configurations we can by Run->Edit Configurations
8.the last is to use coverage test we can
use it by Run -> Run'TriangleTest'with coverage
the result as follow
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