diff --git a/backend/tests/test_artifacts.py b/backend/tests/test_artifacts.py
index bb77d11..8f32857 100644
--- a/backend/tests/test_artifacts.py
+++ b/backend/tests/test_artifacts.py
@@ -1,9 +1,5 @@
 from pathlib import Path
 
-from fastapi.testclient import TestClient
-
-from app.main import app
-
 
 def test_project_var_artifact_path_is_served(tmp_path, monkeypatch):
     from app import main
@@ -30,6 +26,7 @@ def test_project_var_artifact_path_is_served(tmp_path, monkeypatch):
     )
     monkeypatch.setattr(main, "settings", patched)
 
-    response = TestClient(app).get("/api/artifacts/var/uploads/datasets/case/labels/label.txt")
-    assert response.status_code == 200
-    assert response.text == "ok"
+    response = main.api_artifact("var/uploads/datasets/case/labels/label.txt")
+
+    assert Path(response.path) == artifact
+    assert response.media_type == "text/plain"
diff --git a/backend/tests/test_jobs.py b/backend/tests/test_jobs.py
index 07303e6..9f173c8 100644
--- a/backend/tests/test_jobs.py
+++ b/backend/tests/test_jobs.py
@@ -1,12 +1,19 @@
-from fastapi.testclient import TestClient
+import asyncio
 
 from app import jobs
 from app.commands import CommandSpec
 from app.jobs import default_conda_env_for_job
-from app.main import _job_with_progress, app
+from app.main import _job_with_progress
 from app.schemas import JobCreate
 
 
+async def _stream_text(response) -> str:
+    chunks = []
+    async for chunk in response.body_iterator:
+        chunks.append(chunk.decode("utf-8") if isinstance(chunk, bytes) else chunk)
+    return "".join(chunks)
+
+
 def test_mmseg_jobs_use_mmseg_conda_env_by_default():
     assert default_conda_env_for_job("mmseg.train") == "seg_mmcv"
     assert default_conda_env_for_job("segmodel.train") == "seg_smp"
@@ -57,8 +64,9 @@ def test_job_events_respect_log_offset(tmp_path, monkeypatch):
         return {"id": job_id, "status": "success", "log_path": str(log_path)}
 
     monkeypatch.setattr(main.db, "get_job", fake_get_job)
-    response = TestClient(app).get(f"/api/jobs/job1/events?offset={len(old_chunk.encode('utf-8'))}")
+    response = asyncio.run(main.api_job_events("job1", offset=len(old_chunk.encode("utf-8"))))
+    text = asyncio.run(_stream_text(response))
 
-    assert response.status_code == 200
-    assert "new chunk" in response.text
-    assert "old chunk" not in response.text
+    assert response.media_type == "text/event-stream"
+    assert "new chunk" in text
+    assert "old chunk" not in text
diff --git a/backend/tests/test_results_service.py b/backend/tests/test_results_service.py
index 80c7f7e..4f5ad7a 100644
--- a/backend/tests/test_results_service.py
+++ b/backend/tests/test_results_service.py
@@ -1,9 +1,6 @@
 from pathlib import Path
 
-from fastapi.testclient import TestClient
-
 from app import main
-from app.main import app
 from app.modules.results.service import parse_training_curve
 
 
@@ -39,9 +36,9 @@ def test_results_api_honors_limit(monkeypatch):
         return [{"name": "a.png", "relative_path": "var/a.png"}]
 
     monkeypatch.setattr(main, "scan_results", fake_scan_results)
-    response = TestClient(app).get("/api/results?limit=123")
+    response = main.api_results(limit=123)
 
-    assert response.status_code == 200
+    assert response == [{"name": "a.png", "relative_path": "var/a.png"}]
     assert calls["limit"] == 123
 
 
@@ -53,7 +50,7 @@ def test_results_curve_api_honors_limit(monkeypatch):
         return [{"name": "results", "relative_path": "var/results.csv"}]
 
     monkeypatch.setattr(main, "scan_training_curves", fake_scan_training_curves)
-    response = TestClient(app).get("/api/results/curves?limit=77")
+    response = main.api_result_curves(limit=77)
 
-    assert response.status_code == 200
+    assert response == [{"name": "results", "relative_path": "var/results.csv"}]
     assert calls["limit"] == 77