chore: import upstream snapshot with attribution

tests/fixtures/SpringDI.java

@@ -0,0 +1,78 @@
+package com.example.shop;
+
+import org.springframework.stereotype.Service;
+import org.springframework.stereotype.Repository;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Controller;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import lombok.RequiredArgsConstructor;
+
+// Plain interface — not a Spring bean
+public interface OrderRepository {
+    void save(Order order);
+    Order findById(Long id);
+}
+
+// @Repository stereotype — Spring-managed bean
+@Repository
+class JpaOrderRepository implements OrderRepository {
+    @Override
+    public void save(Order order) {}
+
+    @Override
+    public Order findById(Long id) { return null; }
+}
+
+// @Service with @Autowired field injection
+@Service
+class NotificationService {
+    @Autowired
+    private OrderRepository orderRepository;
+
+    public void notify(Long orderId) {
+        Order o = orderRepository.findById(orderId);
+    }
+}
+
+// @Service with Lombok @RequiredArgsConstructor (constructor injection via final fields)
+@Service
+@RequiredArgsConstructor
+class OrderService {
+    private final OrderRepository orderRepository;
+    private final NotificationService notificationService;
+    private static final String TAG = "OrderService";  // static final — NOT injected
+
+    public void placeOrder(Order order) {
+        orderRepository.save(order);
+        notificationService.notify(order.getId());
+    }
+}
+
+// @Component with explicit @Autowired constructor
+@Component
+class AuditLogger {
+    private final OrderRepository orderRepository;
+
+    @Autowired
+    public AuditLogger(OrderRepository orderRepository) {
+        this.orderRepository = orderRepository;
+    }
+
+    public void log(String msg) {}
+}
+
+// @Configuration with @Bean factory methods
+@Configuration
+class AppConfig {
+    @Bean
+    public OrderRepository orderRepository() {
+        return new JpaOrderRepository();
+    }
+}
+
+class Order {
+    private Long id;
+    public Long getId() { return id; }
+}