[router] Implement HTTP Dependency Injection Pattern for Router System (#8714)

sgl-router/tests/common/mod.rs

@@ -1,2 +1,15 @@
 pub mod mock_worker;
 pub mod test_app;
+
+use sglang_router_rs::config::RouterConfig;
+use sglang_router_rs::server::AppContext;
+use std::sync::Arc;
+
+/// Helper function to create AppContext for tests
+pub fn create_test_context(config: RouterConfig) -> Arc<AppContext> {
+    Arc::new(AppContext::new(
+        config.clone(),
+        reqwest::Client::new(),
+        config.max_concurrent_requests,
+    ))
+}