修正

springboot_04_junit/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

springboot_04_junit/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>3.0.4</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.yv</groupId>
+	<artifactId>springboot_04_junit</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>springboot_04_junit</name>
+	<description>Demo project for Spring Boot</description>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

springboot_04_junit/src/main/java/com/yv/Springboot04JunitApplication.java

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+package com.yv;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Springboot04JunitApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Springboot04JunitApplication.class, args);
+	}
+
+}

springboot_04_junit/src/main/resources/application.properties

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+

springboot_04_junit/src/test/java/com/yv/Springboot04JunitApplicationTests.java

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+package com.yv;
+
+import com.yv.dao.BookDao;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class Springboot04JunitApplicationTests {
+
+	//1.注入你要测试的对象
+	@Autowired
+	private BookDao bookDao;
+
+	@Test
+	void contextLoads() {
+		//2.执行要测试的对象对应的方法
+		bookDao.save();
+	}
+
+}

springboot_04_junit/src/test/java/com/yv/dao/BookDao.java

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+package com.yv.dao;
+
+/**
+ * @author YoVinchen
+ * @date 2023/3/9 下午 2:31
+ */
+public interface BookDao {
+    public void save();
+}

springboot_04_junit/src/test/java/com/yv/dao/impl/BookDaoImpl.java

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+package com.yv.dao.impl;
+
+import com.yv.dao.BookDao;
+import org.springframework.stereotype.Repository;
+
+/**
+ * @author YoVinchen
+ * @date 2023/3/9 下午 2:31
+ */
+
+@Repository
+public class BookDaoImpl implements BookDao {
+
+    @Override
+    public void save() {
+        System.out.println("book dao is running ....");
+    }
+}