[router] add request format unit test (#8300)

sgl-router/tests/request_formats_test.rs

+mod common;
+
+use actix_web::{http::StatusCode, rt::System, test as actix_test, web, App};
+use common::mock_worker::{HealthStatus, MockWorker, MockWorkerConfig, WorkerType};
+use reqwest::Client;
+use serde_json::json;
+use sglang_router_rs::config::{PolicyConfig, RouterConfig, RoutingMode};
+use sglang_router_rs::server::{
+    add_worker, generate, v1_chat_completions, v1_completions, AppState,
+};
+
+/// Test context for request type testing
+struct RequestTestContext {
+    workers: Vec<MockWorker>,
+    app_state: web::Data<AppState>,
+}
+
+impl RequestTestContext {
+    async fn new(worker_configs: Vec<MockWorkerConfig>) -> Self {
+        let mut workers = Vec::new();
+        let mut worker_urls = Vec::new();
+
+        // Start mock workers
+        for config in worker_configs {
+            let mut worker = MockWorker::new(config);
+            let url = worker.start().await.unwrap();
+            worker_urls.push(url);
+            workers.push(worker);
+        }
+
+        tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;
+
+        // Create router config
+        let config = RouterConfig {
+            mode: RoutingMode::Regular {
+                worker_urls: vec![],
+            },
+            policy: PolicyConfig::Random,
+            host: "127.0.0.1".to_string(),
+            port: 3006,
+            max_payload_size: 256 * 1024 * 1024,
+            request_timeout_secs: 600,
+            worker_startup_timeout_secs: 1,
+            worker_startup_check_interval_secs: 1,
+            discovery: None,
+            metrics: None,
+            log_dir: None,
+            log_level: None,
+        };
+
+        let client = Client::builder()
+            .timeout(std::time::Duration::from_secs(config.request_timeout_secs))
+            .build()
+            .unwrap();
+
+        let app_state = AppState::new(config, client).unwrap();
+        let app_state = web::Data::new(app_state);
+
+        // Add workers via HTTP API
+        let app =
+            actix_test::init_service(App::new().app_data(app_state.clone()).service(add_worker))
+                .await;
+
+        for url in &worker_urls {
+            let req = actix_test::TestRequest::post()
+                .uri(&format!("/add_worker?url={}", url))
+                .to_request();
+            let resp = actix_test::call_service(&app, req).await;
+            assert!(resp.status().is_success());
+        }
+
+        tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
+
+        Self { workers, app_state }
+    }
+
+    async fn create_app(
+        &self,
+    ) -> impl actix_web::dev::Service<
+        actix_http::Request,
+        Response = actix_web::dev::ServiceResponse,
+        Error = actix_web::Error,
+    > {
+        actix_test::init_service(
+            App::new()
+                .app_data(self.app_state.clone())
+                .service(generate)
+                .service(v1_chat_completions)
+                .service(v1_completions),
+        )
+        .await
+    }
+
+    async fn shutdown(mut self) {
+        for worker in &mut self.workers {
+            worker.stop().await;
+        }
+    }
+}
+
+#[cfg(test)]
+mod generate_input_format_tests {
+    use super::*;
+
+    #[test]
+    fn test_generate_with_text_input() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21001,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            // Standard text input
+            let payload = json!({
+                "text": "Hello world",
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            let body: serde_json::Value = actix_test::read_body_json(resp).await;
+            assert!(body.get("text").is_some());
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_generate_with_prompt_input() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21002,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            // Prompt input (alternative to text)
+            let payload = json!({
+                "prompt": "Once upon a time",
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_generate_with_input_ids() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21003,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            // Input IDs (tokenized input)
+            let payload = json!({
+                "input_ids": [1, 2, 3, 4, 5],
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_generate_with_all_parameters() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21004,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            // All generation parameters
+            let payload = json!({
+                "text": "Complete this",
+                "temperature": 0.7,
+                "top_p": 0.9,
+                "top_k": 50,
+                "max_new_tokens": 100,
+                "min_new_tokens": 10,
+                "frequency_penalty": 0.5,
+                "presence_penalty": 0.3,
+                "repetition_penalty": 1.1,
+                "stop": [".", "!", "?"],
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+}
+
+#[cfg(test)]
+mod chat_completion_format_tests {
+    use super::*;
+
+    #[test]
+    fn test_chat_with_system_message() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21010,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "messages": [
+                    {"role": "system", "content": "You are a helpful assistant."},
+                    {"role": "user", "content": "Hello!"}
+                ]
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/chat/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    // Note: Function calling and tools tests are commented out because
+    // they require special handling in the mock worker that's not implemented yet.
+    // In production, these would be forwarded to the actual model.
+
+    // #[test]
+    // fn test_chat_with_function_calling() {
+    //     // Test would go here when mock worker supports function calling
+    // }
+
+    // #[test]
+    // fn test_chat_with_tools() {
+    //     // Test would go here when mock worker supports tools
+    // }
+
+    #[test]
+    fn test_chat_with_response_format() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21013,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "messages": [
+                    {"role": "user", "content": "Return JSON"}
+                ],
+                "response_format": {
+                    "type": "json_object"
+                }
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/chat/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+}
+
+#[cfg(test)]
+mod completion_format_tests {
+    use super::*;
+
+    #[test]
+    fn test_completion_with_single_prompt() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21020,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "prompt": "Once upon a time",
+                "max_tokens": 50
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            let body: serde_json::Value = actix_test::read_body_json(resp).await;
+            assert!(body.get("choices").is_some());
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_completion_with_batch_prompts() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21021,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "prompt": ["First prompt", "Second prompt", "Third prompt"],
+                "max_tokens": 30
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_completion_with_echo() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21022,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "prompt": "Echo this prompt",
+                "echo": true,
+                "max_tokens": 20
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_completion_with_logprobs() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21023,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "prompt": "Calculate probability",
+                "logprobs": 5,
+                "max_tokens": 10
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_completion_with_suffix() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21024,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "model": "test-model",
+                "prompt": "Insert text here: ",
+                "suffix": " and continue from here.",
+                "max_tokens": 20
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/v1/completions")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+}
+
+#[cfg(test)]
+mod stop_sequence_tests {
+    use super::*;
+
+    #[test]
+    fn test_stop_sequences_array() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21030,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "text": "Generate until stop",
+                "stop": [".", "!", "?", "\n"],
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+
+    #[test]
+    fn test_stop_sequences_string() {
+        System::new().block_on(async {
+            let ctx = RequestTestContext::new(vec![MockWorkerConfig {
+                port: 21031,
+                worker_type: WorkerType::Regular,
+                health_status: HealthStatus::Healthy,
+                response_delay_ms: 0,
+                fail_rate: 0.0,
+            }])
+            .await;
+
+            let app = ctx.create_app().await;
+
+            let payload = json!({
+                "text": "Generate until stop",
+                "stop": "\n\n",
+                "stream": false
+            });
+
+            let req = actix_test::TestRequest::post()
+                .uri("/generate")
+                .set_json(&payload)
+                .to_request();
+
+            let resp = actix_test::call_service(&app, req).await;
+            assert_eq!(resp.status(), StatusCode::OK);
+
+            ctx.shutdown().await;
+        });
+    }
+}