修正

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

@@ -0,0 +1,13 @@
+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

@@ -0,0 +1 @@
+

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

@@ -0,0 +1,21 @@
+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

@@ -0,0 +1,9 @@
+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

@@ -0,0 +1,18 @@
+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 ....");
+    }
+}