Spring Boot -如何通过实现BeforeAllCallback的自定义扩展类来设置或覆盖在application.yml中定义的属性？

import org.junit.jupiter.api.extension.BeforeAllCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
import org.springframework.test.context.BootstrapWith;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@BootstrapWith(SpringBootTestContextBootstrapper.class)
public class CustomExtension implements BeforeAllCallback {

    @Override
    public void beforeAll(ExtensionContext context) throws Exception {
        // 在这里可以进行一些自定义的操作，例如设置或覆盖属性值
        System.setProperty("custom.property", "custom value");
    }
}

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
@ExtendWith(CustomExtension.class)
public class MyTest {

    @Test
    public void myTestMethod() {
        // 测试方法的代码
    }
}