// SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

pub mod kserve_test {
    // For using gRPC client for test
    pub mod inference {
        tonic::include_proto!("inference");
    }
    use inference::grpc_inference_service_client::GrpcInferenceServiceClient;
    use inference::{
        DataType, ModelConfigRequest, ModelInferRequest, ModelInferResponse, ModelMetadataRequest,
    };

    use anyhow::Error;
    use async_stream::stream;
    use dynamo_llm::grpc::service::kserve::KserveService;
    use dynamo_llm::protocols::{
        Annotated,
        openai::{
            chat_completions::{
                NvCreateChatCompletionRequest, NvCreateChatCompletionStreamResponse,
            },
            completions::{NvCreateCompletionRequest, NvCreateCompletionResponse},
        },
    };
    use dynamo_runtime::{
        CancellationToken,
        pipeline::{
            AsyncEngine, AsyncEngineContextProvider, ManyOut, ResponseStream, SingleIn, async_trait,
        },
    };
    use rstest::*;
    use std::sync::Arc;
    use std::time::Duration;
    use tokio::time::timeout;
    use tonic::{Request, Response, transport::Channel};

    use dynamo_async_openai::types::Prompt;

    struct SplitEngine {}

    // Add a new long-running test engine
    struct LongRunningEngine {
        delay_ms: u64,
        cancelled: Arc<std::sync::atomic::AtomicBool>,
    }

    impl LongRunningEngine {
        fn new(delay_ms: u64) -> Self {
            Self {
                delay_ms,
                cancelled: Arc::new(std::sync::atomic::AtomicBool::new(false)),
            }
        }

        fn was_cancelled(&self) -> bool {
            self.cancelled.load(std::sync::atomic::Ordering::Acquire)
        }

        // Wait for the duration of generation delay to ensure the generate stream
        // has been terminated early (`was_cancelled` remains true).
        async fn wait_for_delay(&self) {
            tokio::time::sleep(std::time::Duration::from_millis(self.delay_ms)).await;
        }
    }

    #[async_trait]
    impl
        AsyncEngine<
            SingleIn<NvCreateCompletionRequest>,
            ManyOut<Annotated<NvCreateCompletionResponse>>,
            Error,
        > for SplitEngine
    {
        async fn generate(
            &self,
            request: SingleIn<NvCreateCompletionRequest>,
        ) -> Result<ManyOut<Annotated<NvCreateCompletionResponse>>, Error> {
            let (request, context) = request.transfer(());
            let ctx = context.context();

            // let generator = NvCreateChatCompletionStreamResponse::generator(request.model.clone());
            let generator = request.response_generator(ctx.id().to_string());

            let word_list: Vec<String> = match request.inner.prompt {
                Prompt::String(str) => str.split(' ').map(|s| s.to_string()).collect(),
                _ => {
                    return Err(Error::msg("SplitEngine only support prompt type String"))?;
                }
            };
            let stream = stream! {
                tokio::time::sleep(std::time::Duration::from_millis(10)).await;
                for word in word_list {
                    yield Annotated::from_data(generator.create_choice(0, Some(word.to_string()), None, None));
                }
            };

            Ok(ResponseStream::new(Box::pin(stream), ctx))
        }
    }

    #[async_trait]
    impl
        AsyncEngine<
            SingleIn<NvCreateCompletionRequest>,
            ManyOut<Annotated<NvCreateCompletionResponse>>,
            Error,
        > for LongRunningEngine
    {
        async fn generate(
            &self,
            request: SingleIn<NvCreateCompletionRequest>,
        ) -> Result<ManyOut<Annotated<NvCreateCompletionResponse>>, Error> {
            let (_request, context) = request.transfer(());
            let ctx = context.context();

            tracing::info!(
                "LongRunningEngine: Starting generation with {}ms delay",
                self.delay_ms
            );

            let cancelled_flag = self.cancelled.clone();
            let delay_ms = self.delay_ms;

            let ctx_clone = ctx.clone();
            let stream = async_stream::stream! {

                // the stream can be dropped or it can be cancelled
                // either way we consider this a cancellation
                cancelled_flag.store(true, std::sync::atomic::Ordering::SeqCst);

                tokio::select! {
                    _ = tokio::time::sleep(std::time::Duration::from_millis(delay_ms)) => {
                        // the stream went to completion
                        cancelled_flag.store(false, std::sync::atomic::Ordering::SeqCst);

                    }
                    _ = ctx_clone.stopped() => {
                        cancelled_flag.store(true, std::sync::atomic::Ordering::SeqCst);
                    }
                }

                yield Annotated::<NvCreateCompletionResponse>::from_annotation("event.dynamo.test.sentinel", &"DONE".to_string()).expect("Failed to create annotated response");
            };

            Ok(ResponseStream::new(Box::pin(stream), ctx))
        }
    }

    struct AlwaysFailEngine {}

    #[async_trait]
    impl
        AsyncEngine<
            SingleIn<NvCreateChatCompletionRequest>,
            ManyOut<Annotated<NvCreateChatCompletionStreamResponse>>,
            Error,
        > for AlwaysFailEngine
    {
        async fn generate(
            &self,
            _request: SingleIn<NvCreateChatCompletionRequest>,
        ) -> Result<ManyOut<Annotated<NvCreateChatCompletionStreamResponse>>, Error> {
            Err(Error::msg("Always fail"))?
        }
    }

    #[async_trait]
    impl
        AsyncEngine<
            SingleIn<NvCreateCompletionRequest>,
            ManyOut<Annotated<NvCreateCompletionResponse>>,
            Error,
        > for AlwaysFailEngine
    {
        async fn generate(
            &self,
            _request: SingleIn<NvCreateCompletionRequest>,
        ) -> Result<ManyOut<Annotated<NvCreateCompletionResponse>>, Error> {
            Err(Error::msg("Always fail"))?
        }
    }

    /// Wait for the HTTP service to be ready by checking its health endpoint
    async fn get_ready_client(port: u16, timeout_secs: u64) -> GrpcInferenceServiceClient<Channel> {
        let start = tokio::time::Instant::now();
        let timeout = tokio::time::Duration::from_secs(timeout_secs);
        loop {
            let address = format!("http://0.0.0.0:{}", port);
            match GrpcInferenceServiceClient::connect(address).await {
                Ok(client) => return client,
                Err(_) if start.elapsed() < timeout => {
                    tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
                }
                Err(e) => panic!("Service failed to start within timeout: {}", e),
            }
        }
    }

    #[fixture]
    fn text_input(
        #[default("dummy input")] text: &str,
    ) -> inference::model_infer_request::InferInputTensor {
        inference::model_infer_request::InferInputTensor {
            name: "text_input".into(),
            datatype: "BYTES".into(),
            shape: vec![1],
            contents: Some(inference::InferTensorContents {
                bytes_contents: vec![text.into()],
                ..Default::default()
            }),
            ..Default::default()
        }
    }

    #[fixture]
    fn service_with_engines(
        #[default(8990)] port: u16,
    ) -> (
        KserveService,
        Arc<SplitEngine>,
        Arc<AlwaysFailEngine>,
        Arc<LongRunningEngine>,
    ) {
        let service = KserveService::builder().port(port).build().unwrap();
        let manager = service.model_manager();

        let split = Arc::new(SplitEngine {});
        let failure = Arc::new(AlwaysFailEngine {});
        let long_running = Arc::new(LongRunningEngine::new(1_000));

        manager
            .add_completions_model("split", split.clone())
            .unwrap();
        manager
            .add_chat_completions_model("failure", failure.clone())
            .unwrap();
        manager
            .add_completions_model("failure", failure.clone())
            .unwrap();
        manager
            .add_completions_model("long_running", long_running.clone())
            .unwrap();

        (service, split, failure, long_running)
    }

    struct RunningService {
        token: CancellationToken,
    }

    impl RunningService {
        fn spawn(service: KserveService) -> Self {
            let token = CancellationToken::new();
            tokio::spawn({
                let t = token.clone();
                async move { service.run(t).await }
            });
            Self { token }
        }
    }

    impl Drop for RunningService {
        fn drop(&mut self) {
            self.token.cancel();
        }
    }

    // Tests may run in parallel, use this enum to keep track of port used for different
    // test cases
    enum TestPort {
        InferFailure = 8988,
        InferSuccess = 8989,
        StreamInferFailure = 8990,
        StreamInferSuccess = 8991,
        InferCancellation = 8992,
        StreamInferCancellation = 8993,
        ModelInfo = 8994,
    }

    #[rstest]
    #[tokio::test]
    async fn test_infer_failure(
        #[with(TestPort::InferFailure as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::InferFailure as u16, 5).await;

        // unknown_model
        let request = tonic::Request::new(ModelInferRequest {
            model_name: "Tonic".into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![text_input.clone()],
            ..Default::default()
        });

        let response = client.model_infer(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::NotFound,
            "Expected NotFound error for unregistered model, get {}",
            err
        );

        // missing input
        let request = tonic::Request::new(ModelInferRequest {
            model_name: "split".into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![],
            ..Default::default()
        });

        let response = client.model_infer(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::InvalidArgument,
            "Expected InvalidArgument error for missing input, get {}",
            err
        );

        // request streaming
        let request = tonic::Request::new(ModelInferRequest {
            model_name: "split".into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![
                text_input.clone(),
                inference::model_infer_request::InferInputTensor {
                    name: "streaming".into(),
                    datatype: "BOOL".into(),
                    shape: vec![1],
                    contents: Some(inference::InferTensorContents {
                        bool_contents: vec![true],
                        ..Default::default()
                    }),
                    ..Default::default()
                },
            ],
            ..Default::default()
        });

        let response = client.model_infer(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::InvalidArgument,
            "Expected InvalidArgument error for streaming, get {}",
            err
        );
        // assert "stream" in error message
        assert!(
            err.message().contains("Streaming is not supported"),
            "Expected error message to contain 'Streaming is not supported', got: {}",
            err.message()
        );

        // AlwaysFailEngine
        let request = tonic::Request::new(ModelInferRequest {
            model_name: "failure".into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![text_input.clone()],
            ..Default::default()
        });

        let response = client.model_infer(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::Internal,
            "Expected Internal error for streaming, get {}",
            err
        );
        assert!(
            err.message().contains("Failed to generate completions:"),
            "Expected error message to contain 'Failed to generate completions:', got: {}",
            err.message()
        );
    }

    #[rstest]
    #[tokio::test]
    async fn test_infer_success(
        #[with(TestPort::InferSuccess as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);

        let mut client = get_ready_client(TestPort::InferSuccess as u16, 5).await;

        let model_name = "split";
        let request = tonic::Request::new(ModelInferRequest {
            model_name: model_name.into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![text_input.clone()],
            ..Default::default()
        });

        let response = client.model_infer(request).await.unwrap();
        validate_infer_response(response, model_name);

        // Input data in raw_input_content
        let mut text_input = text_input.clone();
        text_input.contents = None; // Clear contents to use raw_input_contents
        let text_input_str = "dummy input";
        let input_len = text_input_str.len() as u32;
        let mut serialized_input = input_len.to_le_bytes().to_vec();
        serialized_input.extend_from_slice(text_input_str.as_bytes());
        let request = tonic::Request::new(ModelInferRequest {
            model_name: model_name.into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![text_input],
            raw_input_contents: vec![serialized_input],
            ..Default::default()
        });
        let response = client.model_infer(request).await.unwrap();
        validate_infer_response(response, model_name);
    }

    fn validate_infer_response(response: Response<ModelInferResponse>, model_name: &str) {
        assert_eq!(
            response.get_ref().model_name,
            model_name,
            "Expected response of the same model name",
        );
        for output in &response.get_ref().outputs {
            match output.name.as_str() {
                "text_output" => {
                    assert_eq!(
                        output.datatype, "BYTES",
                        "Expected 'text_output' to have datatype 'BYTES'"
                    );
                    assert_eq!(
                        output.shape,
                        vec![1],
                        "Expected 'text_output' to have shape [1]"
                    );
                    let expected_output: Vec<Vec<u8>> = vec!["dummyinput".into()];
                    assert_eq!(
                        output.contents.as_ref().unwrap().bytes_contents,
                        expected_output,
                        "Expected 'text_output' to contain 'dummy input'"
                    );
                }
                "finish_reason" => {
                    assert_eq!(
                        output.datatype, "BYTES",
                        "Expected 'finish_reason' to have datatype 'BYTES'"
                    );
                    assert_eq!(
                        output.shape,
                        vec![0],
                        "Expected 'finish_reason' to have shape [0]"
                    );
                }
                _ => panic!("Unexpected output name: {}", output.name),
            }
        }
    }

    #[rstest]
    #[tokio::test]
    async fn test_infer_cancellation(
        #[with(TestPort::InferCancellation as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);
        let long_running = service_with_engines.3;

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::InferCancellation as u16, 5).await;

        let model_name = "long_running";
        let request = tonic::Request::new(ModelInferRequest {
            model_name: model_name.into(),
            model_version: "1".into(),
            id: "1234".into(),
            inputs: vec![text_input],
            ..Default::default()
        });

        assert!(
            !long_running.was_cancelled(),
            "Expected long running engine is not cancelled"
        );

        // Cancelling the request by dropping the request future after 1 second
        let response = match timeout(Duration::from_millis(500), client.model_infer(request)).await
        {
            Ok(_) => Err("Expect request timed out"),
            Err(_) => {
                println!("Cancelled request after 500ms");
                Ok("timed out")
            }
        };
        assert!(response.is_ok(), "Expected client timed out",);
        long_running.wait_for_delay().await;
        assert!(
            long_running.was_cancelled(),
            "Expected long running engine to be cancelled"
        );
    }

    #[rstest]
    #[tokio::test]
    async fn test_stream_infer_success(
        #[with(TestPort::StreamInferSuccess as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::StreamInferSuccess as u16, 5).await;

        let model_name = "split";
        let request_id = "1234";

        // Response streaming true
        {
            let text_input = text_input.clone();
            let outbound = async_stream::stream! {
                let request_count = 1;
                for _ in 0..request_count {
                    let request = ModelInferRequest {
                        model_name: model_name.into(),
                        model_version: "1".into(),
                        id: request_id.into(),
                        inputs: vec![text_input.clone(),
                        inference::model_infer_request::InferInputTensor{
                            name: "streaming".into(),
                            datatype: "BOOL".into(),
                            shape: vec![1],
                            contents: Some(inference::InferTensorContents {
                                bool_contents: vec![true],
                                ..Default::default()
                            }),
                            ..Default::default()
                        }],
                        ..Default::default()
                    };

                    yield request;
                }
            };

            let response = client
                .model_stream_infer(Request::new(outbound))
                .await
                .unwrap();
            let mut inbound = response.into_inner();

            let mut response_idx = 0;
            while let Some(response) = inbound.message().await.unwrap() {
                assert!(
                    response.error_message.is_empty(),
                    "Expected successful inference"
                );
                assert!(
                    response.infer_response.is_some(),
                    "Expected successful inference"
                );

                if let Some(response) = &response.infer_response {
                    assert_eq!(
                        response.model_name, model_name,
                        "Expected response of the same model name",
                    );
                    assert_eq!(
                        response.id, request_id,
                        "Expected response ID to match request ID"
                    );
                    let expected_output: Vec<Vec<u8>> = vec!["dummy".into(), "input".into()];
                    for output in &response.outputs {
                        match output.name.as_str() {
                            "text_output" => {
                                assert_eq!(
                                    output.datatype, "BYTES",
                                    "Expected 'text_output' to have datatype 'BYTES'"
                                );
                                assert_eq!(
                                    output.shape,
                                    vec![1],
                                    "Expected 'text_output' to have shape [1]"
                                );
                                assert_eq!(
                                    output.contents.as_ref().unwrap().bytes_contents,
                                    vec![expected_output[response_idx].clone()],
                                    "Expected 'text_output' to contain 'dummy input'"
                                );
                            }
                            "finish_reason" => {
                                assert_eq!(
                                    output.datatype, "BYTES",
                                    "Expected 'finish_reason' to have datatype 'BYTES'"
                                );
                                assert_eq!(
                                    output.shape,
                                    vec![0],
                                    "Expected 'finish_reason' to have shape [0]"
                                );
                            }
                            _ => panic!("Unexpected output name: {}", output.name),
                        }
                    }
                }
                response_idx += 1;
            }
            assert_eq!(response_idx, 2, "Expected 2 responses")
        }

        // Response streaming false
        {
            let text_input = text_input.clone();
            let outbound = async_stream::stream! {
                let request_count = 2;
                for idx in 0..request_count {
                    let request = ModelInferRequest {
                        model_name: model_name.into(),
                        model_version: "1".into(),
                        id: format!("{idx}"),
                        inputs: vec![text_input.clone()],
                        ..Default::default()
                    };

                    yield request;
                }
            };

            let response = client
                .model_stream_infer(Request::new(outbound))
                .await
                .unwrap();
            let mut inbound = response.into_inner();

            let mut response_idx = 0;
            while let Some(response) = inbound.message().await.unwrap() {
                assert!(
                    response.error_message.is_empty(),
                    "Expected successful inference"
                );
                assert!(
                    response.infer_response.is_some(),
                    "Expected successful inference"
                );

                // Each response is the complete inference
                if let Some(response) = &response.infer_response {
                    assert_eq!(
                        response.model_name, model_name,
                        "Expected response of the same model name",
                    );
                    // [gluo NOTE] Here we assume the responses across requests are
                    // processed in the order of receiving requests, which is not true
                    // if we improve stream handling in gRPC frontend. Consider:
                    //   time 0: request 0 -> long running -> response 0 (time 5)
                    //   time 1: request 1 -> short running -> response 1 (time 2)
                    // We expect response 1 to be received before response 0 as their
                    // requests are independent from each other.
                    assert_eq!(
                        response.id,
                        format!("{response_idx}"),
                        "Expected response ID to match request ID"
                    );
                    for output in &response.outputs {
                        match output.name.as_str() {
                            "text_output" => {
                                assert_eq!(
                                    output.datatype, "BYTES",
                                    "Expected 'text_output' to have datatype 'BYTES'"
                                );
                                assert_eq!(
                                    output.shape,
                                    vec![1],
                                    "Expected 'text_output' to have shape [1]"
                                );
                                let expected_output: Vec<Vec<u8>> = vec!["dummyinput".into()];
                                assert_eq!(
                                    output.contents.as_ref().unwrap().bytes_contents,
                                    expected_output,
                                    "Expected 'text_output' to contain 'dummyinput'"
                                );
                            }
                            "finish_reason" => {
                                assert_eq!(
                                    output.datatype, "BYTES",
                                    "Expected 'finish_reason' to have datatype 'BYTES'"
                                );
                                assert_eq!(
                                    output.shape,
                                    vec![0],
                                    "Expected 'finish_reason' to have shape [0]"
                                );
                            }
                            _ => panic!("Unexpected output name: {}", output.name),
                        }
                    }
                }
                response_idx += 1;
            }
            assert_eq!(
                response_idx, 2,
                "Expected 2 responses, each for one of the two requests"
            )
        }
    }

    #[rstest]
    #[tokio::test]
    async fn test_stream_infer_failure(
        #[with(TestPort::StreamInferFailure as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::StreamInferFailure as u16, 5).await;

        let model_name = "failure";

        let outbound = async_stream::stream! {
            let request_count = 1;
            for _ in 0..request_count {
                let request = ModelInferRequest {
                    model_name: model_name.into(),
                    model_version: "1".into(),
                    id: "1234".into(),
                    inputs: vec![text_input.clone()],
                    ..Default::default()
                };

                yield request;
            }
        };

        let response = client
            .model_stream_infer(Request::new(outbound))
            .await
            .unwrap();
        let mut inbound = response.into_inner();

        loop {
            match inbound.message().await {
                Ok(Some(_)) => {
                    panic!("Expecting failure in the stream");
                }
                Err(err) => {
                    assert_eq!(
                        err.code(),
                        tonic::Code::Internal,
                        "Expected Internal error for streaming, get {}",
                        err
                    );
                    assert!(
                        err.message().contains("Failed to generate completions:"),
                        "Expected error message to contain 'Failed to generate completions:', got: {}",
                        err.message()
                    );
                }
                Ok(None) => {
                    // End of stream
                    break;
                }
            }
        }
    }

    #[rstest]
    #[tokio::test]
    async fn test_stream_infer_cancellation(
        #[with(TestPort::StreamInferCancellation as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
        text_input: inference::model_infer_request::InferInputTensor,
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);
        let long_running = service_with_engines.3;

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::StreamInferCancellation as u16, 5).await;

        let model_name = "long_running";
        let outbound = async_stream::stream! {
            let request_count = 1;
            for _ in 0..request_count {
                let request = ModelInferRequest {
                    model_name: model_name.into(),
                    model_version: "1".into(),
                    id: "1234".into(),
                    inputs: vec![text_input.clone()],
                    ..Default::default()
                };

                yield request;
            }
        };

        assert!(
            !long_running.was_cancelled(),
            "Expected long running engine is still running"
        );

        // Cancelling the request by dropping the request future after 1 second
        let response = match timeout(
            Duration::from_millis(500),
            client.model_stream_infer(Request::new(outbound)),
        )
        .await
        {
            Ok(response) => response.unwrap(),
            Err(_) => {
                panic!("Expected response stream is returned immediately");
            }
        };
        std::mem::drop(response); // Drop the response to cancel the stream

        long_running.wait_for_delay().await;
        assert!(
            long_running.was_cancelled(),
            "Expected long running engine to be cancelled"
        );
    }

    #[rstest]
    #[tokio::test]
    async fn test_model_info(
        #[with(TestPort::ModelInfo as u16)] service_with_engines: (
            KserveService,
            Arc<SplitEngine>,
            Arc<AlwaysFailEngine>,
            Arc<LongRunningEngine>,
        ),
    ) {
        // start server
        let _running = RunningService::spawn(service_with_engines.0);

        // create client and send request to unregistered model
        let mut client = get_ready_client(TestPort::ModelInfo as u16, 5).await;

        // Failure unknown_model
        let request = tonic::Request::new(ModelMetadataRequest {
            name: "Tonic".into(),
            version: "".into(),
        });

        let response = client.model_metadata(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::NotFound,
            "Expected NotFound error for unregistered model, get {}",
            err
        );

        let request = tonic::Request::new(ModelConfigRequest {
            name: "Tonic".into(),
            version: "".into(),
        });

        let response = client.model_config(request).await;
        assert!(response.is_err());
        let err = response.unwrap_err();
        assert_eq!(
            err.code(),
            tonic::Code::NotFound,
            "Expected NotFound error for unregistered model, get {}",
            err
        );

        // Success metadata
        let model_name = "split";
        let request = tonic::Request::new(ModelMetadataRequest {
            name: model_name.into(),
            version: "1".into(),
        });

        let response = client.model_metadata(request).await.unwrap();
        assert_eq!(
            response.get_ref().name,
            model_name,
            "Expected response of the same model name",
        );
        // input
        for io in &response.get_ref().inputs {
            match io.name.as_str() {
                "text_input" => {
                    assert_eq!(
                        io.datatype, "BYTES",
                        "Expected 'text_input' to have datatype 'BYTES'"
                    );
                    assert_eq!(
                        io.shape,
                        vec![1],
                        "Expected 'text_output' to have shape [1]"
                    );
                }
                "streaming" => {
                    assert_eq!(
                        io.datatype, "BOOL",
                        "Expected 'streaming' to have datatype 'BOOL'"
                    );
                    assert_eq!(io.shape, vec![1], "Expected 'streaming' to have shape [1]");
                }
                _ => panic!("Unexpected output name: {}", io.name),
            }
        }
        // output
        for io in &response.get_ref().outputs {
            match io.name.as_str() {
                "text_output" => {
                    assert_eq!(
                        io.datatype, "BYTES",
                        "Expected 'text_output' to have datatype 'BYTES'"
                    );
                    assert_eq!(
                        io.shape,
                        vec![-1],
                        "Expected 'text_output' to have shape [-1]"
                    );
                }
                "finish_reason" => {
                    assert_eq!(
                        io.datatype, "BYTES",
                        "Expected 'finish_reason' to have datatype 'BYTES'"
                    );
                    assert_eq!(
                        io.shape,
                        vec![-1],
                        "Expected 'finish_reason' to have shape [-1]"
                    );
                }
                _ => panic!("Unexpected output name: {}", io.name),
            }
        }

        // success config
        let request = tonic::Request::new(ModelConfigRequest {
            name: model_name.into(),
            version: "1".into(),
        });

        let response = client
            .model_config(request)
            .await
            .unwrap()
            .into_inner()
            .config;
        let Some(config) = response else {
            panic!("Expected Some(config), got None");
        };
        assert_eq!(
            config.name, model_name,
            "Expected response of the same model name",
        );
        // input
        for io in &config.input {
            match io.name.as_str() {
                "text_input" => {
                    assert_eq!(
                        io.data_type,
                        DataType::TypeString as i32,
                        "Expected 'text_input' to have datatype 'TYPE_STRING'"
                    );
                    assert_eq!(io.dims, vec![1], "Expected 'text_output' to have shape [1]");
                }
                "streaming" => {
                    assert_eq!(
                        io.data_type,
                        DataType::TypeBool as i32,
                        "Expected 'streaming' to have datatype 'TYPE_BOOL'"
                    );
                    assert_eq!(io.dims, vec![1], "Expected 'streaming' to have shape [1]");
                }
                _ => panic!("Unexpected output name: {}", io.name),
            }
        }
        // output
        for io in &config.output {
            match io.name.as_str() {
                "text_output" => {
                    assert_eq!(
                        io.data_type,
                        DataType::TypeString as i32,
                        "Expected 'text_output' to have datatype 'TYPE_STRING'"
                    );
                    assert_eq!(
                        io.dims,
                        vec![-1],
                        "Expected 'text_output' to have shape [-1]"
                    );
                }
                "finish_reason" => {
                    assert_eq!(
                        io.data_type,
                        DataType::TypeString as i32,
                        "Expected 'finish_reason' to have datatype 'TYPE_STRING'"
                    );
                    assert_eq!(
                        io.dims,
                        vec![-1],
                        "Expected 'finish_reason' to have shape [-1]"
                    );
                }
                _ => panic!("Unexpected output name: {}", io.name),
            }
        }
    }
}
