Add tests for Ollama client

This commit adds several unit tests for the `generate_oneliner`
function, which interacts with the Ollama API. These tests cover:
- Successful parsing of a chat response.
- Normalization of the response content to remove extra whitespace and
  quotes.
- Handling of HTTP 500 errors from the server.
- Verification of sent request parameters like `keep_alive` and `model`.
- Parsing errors when the `content` field is missing in the response.

server/tests/transcribe_test.rs

@@ -3,9 +3,11 @@ use std::time::Duration;
 
 use doctate_server::transcribe;
 use doctate_server::transcribe::ffmpeg::remux_faststart;
+use doctate_server::transcribe::ollama::{generate_oneliner, OllamaError};
 use doctate_server::transcribe::recovery::scan_and_enqueue;
 use doctate_server::transcribe::whisper::{transcribe, WhisperError};
-use wiremock::matchers::{method, path, query_param};
+use serde_json::json;
+use wiremock::matchers::{body_partial_json, method, path, query_param};
 use wiremock::{Mock, MockServer, ResponseTemplate};
 
 fn fixture(name: &str) -> PathBuf {
@@ -155,3 +157,110 @@ async fn recovery_enqueues_only_pending_recordings() {
     assert!(received[0].ends_with("2026-04-10T10-00-00Z.m4a"));
     assert!(received[1].ends_with("2026-04-12T10-00-00Z.m4a"));
 }
+
+// -------------------- Ollama client --------------------
+
+const MODEL: &str = "gemma3:4b";
+
+fn ok_chat_body(content: &str) -> serde_json::Value {
+    json!({
+        "model": MODEL,
+        "message": {"role": "assistant", "content": content},
+        "done": true
+    })
+}
+
+#[tokio::test]
+async fn ollama_oneliner_parses_chat_response() {
+    let server = MockServer::start().await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(ok_chat_body("HOCM mit Septum-Hypertrophie")))
+        .expect(1)
+        .mount(&server)
+        .await;
+
+    let client = reqwest::Client::new();
+    let out = generate_oneliner(&client, &server.uri(), MODEL, 0, "irrelevant", Duration::from_secs(5))
+        .await
+        .expect("call failed");
+
+    assert_eq!(out, "HOCM mit Septum-Hypertrophie");
+}
+
+#[tokio::test]
+async fn ollama_oneliner_normalizes_response() {
+    let server = MockServer::start().await;
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(ok_chat_body("\"Kniegelenk re., V.a. Meniskus.\"\nSonstiges")))
+        .mount(&server)
+        .await;
+
+    let client = reqwest::Client::new();
+    let out = generate_oneliner(&client, &server.uri(), MODEL, 0, "x", Duration::from_secs(5))
+        .await
+        .unwrap();
+    assert_eq!(out, "Kniegelenk re., V.a. Meniskus");
+}
+
+#[tokio::test]
+async fn ollama_oneliner_returns_status_on_500() {
+    let server = MockServer::start().await;
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(500).set_body_string("boom"))
+        .mount(&server)
+        .await;
+
+    let client = reqwest::Client::new();
+    let err = generate_oneliner(&client, &server.uri(), MODEL, 0, "x", Duration::from_secs(5))
+        .await
+        .expect_err("expected error");
+    match err {
+        OllamaError::Status { status, body } => {
+            assert_eq!(status, 500);
+            assert_eq!(body, "boom");
+        }
+        other => panic!("unexpected: {other:?}"),
+    }
+}
+
+#[tokio::test]
+async fn ollama_oneliner_sends_keep_alive_and_model() {
+    let server = MockServer::start().await;
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .and(body_partial_json(json!({
+            "model": MODEL,
+            "stream": false,
+            "keep_alive": 0
+        })))
+        .respond_with(ResponseTemplate::new(200).set_body_json(ok_chat_body("OK")))
+        .expect(1)
+        .mount(&server)
+        .await;
+
+    let client = reqwest::Client::new();
+    let _ = generate_oneliner(&client, &server.uri(), MODEL, 0, "irrelevant", Duration::from_secs(5))
+        .await
+        .expect("call failed");
+    // Mock::expect(1) + server drop verifies the matcher hit exactly once.
+}
+
+#[tokio::test]
+async fn ollama_oneliner_parse_error_on_missing_content() {
+    let server = MockServer::start().await;
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(json!({"done": true})))
+        .mount(&server)
+        .await;
+
+    let client = reqwest::Client::new();
+    let err = generate_oneliner(&client, &server.uri(), MODEL, 0, "x", Duration::from_secs(5))
+        .await
+        .expect_err("expected parse error");
+    assert!(matches!(err, OllamaError::Parse(_)), "got {err:?}");
+}