单元测试笔记

前言

最近写很多单元测试 一直没记录
今天整理一下 常见的demo 方便后续速查

https://junit.org/junit5/docs/current/user-guide/#overview

JUnit5注解汇总

基础测试控制

参数化测试

测试控制和异常测试

扩展和定制

mockito

Mockito 主要类和函数

Mockito 类与函数

ArgumentMatchers 辅助类

Assertions 主要方法

JUnit Jupiter (org.junit.jupiter.api.Assertions)

示例

• 基本依赖 starter包包含了 junit5和mockito

    testImplementation "org.springframework.boot:spring-boot-starter-test"

• 基本单元测试格式

package com.ming;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
public class DemoTest {
    @BeforeEach
    public void init() {
        System.out.println("init");
    }

    @AfterEach
    public void destroy() {
        System.out.println("destroy");
    }

    @Test
    public void test() {
        System.out.println("test");
    }
}

• mock静态方法

mock静态方法 以前是用powermock junit5之后 mockito也提供mock的方式

   // https://mvnrepository.com/artifact/org.mockito/mockito-inline
   testImplementation group: 'org.mockito', name: 'mockito-inline', version: '5.2.0'

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.MockedStatic;
import org.springframework.test.context.junit.jupiter.SpringExtension;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;

@ExtendWith(SpringExtension.class)
public class MockStaticTest {
    private MockedStatic<StaticTestService> mockStatic;
    @BeforeEach
    public void setUp() {
        mockStatic = org.mockito.Mockito.mockStatic(StaticTestService.class);
    }

    @AfterEach
    public void tearDown() {
        mockStatic.close();
    }

    @Test
    public void testNoArg() {
        mockStatic.when(StaticTestService::testNoArg).thenReturn("test");
        assertEquals("test", StaticTestService.testNoArg());
    }

    @Test
    public void testArg() {
        mockStatic.when(() -> StaticTestService.testArg("arg")).thenReturn("test");
        assertEquals("test", StaticTestService.testArg("arg"));
        assertNotEquals("test", StaticTestService.testArg("arg1"));
    }
}

class StaticTestService {
    public static String testNoArg() {
        return "????";
    }

    public static String testArg(String str) {
        return "????";
    }
}

• mock私有变量

ReflectionTestUtils.setField(testService, “字段名”, “字段赋值”);

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.util.ReflectionTestUtils;

import static org.junit.jupiter.api.Assertions.assertEquals;

@ExtendWith(SpringExtension.class)
public class MockTest {
    @InjectMocks
    private TestService testService;

      @Test
    public void test() {
        assertEquals("????ming-default", testService.getStr());
        ReflectionTestUtils.setField(testService, "str", "ming-update");
        assertEquals("????ming-update", testService.getStr());
    }
}

class TestService {
    private String str = "ming-default";

    public String getStr() {
        return "????" + str;
    }
}

• mock MybatisPlus Mapper

如果用到lambdaXXXXX 需要注入 TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new MybatisConfiguration(), “”), xxxxEntity.class);

总结

就是常见的单元测试方法
junit5 已经成为一个java的单元测试平台了
常见的操作 基本覆盖 配合mockito基本够用