test(backend): add comprehensive tests for OAuth and agent endpoints

- Added tests for OAuth provider admin and consent endpoints covering edge cases.
- Extended agent-related tests to handle incorrect project associations and lifecycle state transitions.
- Introduced tests for sprint status transitions and validation checks.
- Improved multiline formatting consistency across all test functions.

backend/tests/crud/syndarix/test_project_crud.py

@@ -42,7 +42,9 @@ class TestProjectCreate:
             assert result.owner_id == test_owner_crud.id
 
     @pytest.mark.asyncio
-    async def test_create_project_duplicate_slug_fails(self, async_test_db, test_project_crud):
+    async def test_create_project_duplicate_slug_fails(
+        self, async_test_db, test_project_crud
+    ):
         """Test creating project with duplicate slug raises ValueError."""
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
@@ -106,7 +108,9 @@ class TestProjectRead:
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
         async with AsyncTestingSessionLocal() as session:
-            result = await project_crud.get_by_slug(session, slug=test_project_crud.slug)
+            result = await project_crud.get_by_slug(
+                session, slug=test_project_crud.slug
+            )
 
             assert result is not None
             assert result.slug == test_project_crud.slug
@@ -136,7 +140,9 @@ class TestProjectUpdate:
                 name="Updated Project Name",
                 description="Updated description",
             )
-            result = await project_crud.update(session, db_obj=project, obj_in=update_data)
+            result = await project_crud.update(
+                session, db_obj=project, obj_in=update_data
+            )
 
             assert result.name == "Updated Project Name"
             assert result.description == "Updated description"
@@ -150,12 +156,16 @@ class TestProjectUpdate:
             project = await project_crud.get(session, id=str(test_project_crud.id))
 
             update_data = ProjectUpdate(status=ProjectStatus.PAUSED)
-            result = await project_crud.update(session, db_obj=project, obj_in=update_data)
+            result = await project_crud.update(
+                session, db_obj=project, obj_in=update_data
+            )
 
             assert result.status == ProjectStatus.PAUSED
 
     @pytest.mark.asyncio
-    async def test_update_project_autonomy_level(self, async_test_db, test_project_crud):
+    async def test_update_project_autonomy_level(
+        self, async_test_db, test_project_crud
+    ):
         """Test updating project autonomy level."""
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
@@ -163,7 +173,9 @@ class TestProjectUpdate:
             project = await project_crud.get(session, id=str(test_project_crud.id))
 
             update_data = ProjectUpdate(autonomy_level=AutonomyLevel.AUTONOMOUS)
-            result = await project_crud.update(session, db_obj=project, obj_in=update_data)
+            result = await project_crud.update(
+                session, db_obj=project, obj_in=update_data
+            )
 
             assert result.autonomy_level == AutonomyLevel.AUTONOMOUS
 
@@ -175,9 +187,14 @@ class TestProjectUpdate:
         async with AsyncTestingSessionLocal() as session:
             project = await project_crud.get(session, id=str(test_project_crud.id))
 
-            new_settings = {"mcp_servers": ["gitea", "slack"], "webhook_url": "https://example.com"}
+            new_settings = {
+                "mcp_servers": ["gitea", "slack"],
+                "webhook_url": "https://example.com",
+            }
             update_data = ProjectUpdate(settings=new_settings)
-            result = await project_crud.update(session, db_obj=project, obj_in=update_data)
+            result = await project_crud.update(
+                session, db_obj=project, obj_in=update_data
+            )
 
             assert result.settings == new_settings
 
@@ -273,7 +290,9 @@ class TestProjectFilters:
             assert any(p.name == "Searchable Project" for p in projects)
 
     @pytest.mark.asyncio
-    async def test_get_multi_with_filters_owner(self, async_test_db, test_owner_crud, test_project_crud):
+    async def test_get_multi_with_filters_owner(
+        self, async_test_db, test_owner_crud, test_project_crud
+    ):
         """Test filtering projects by owner."""
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
@@ -287,7 +306,9 @@ class TestProjectFilters:
             assert all(p.owner_id == test_owner_crud.id for p in projects)
 
     @pytest.mark.asyncio
-    async def test_get_multi_with_filters_pagination(self, async_test_db, test_owner_crud):
+    async def test_get_multi_with_filters_pagination(
+        self, async_test_db, test_owner_crud
+    ):
         """Test pagination of project results."""
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
@@ -348,7 +369,9 @@ class TestProjectSpecialMethods:
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
         async with AsyncTestingSessionLocal() as session:
-            result = await project_crud.archive_project(session, project_id=test_project_crud.id)
+            result = await project_crud.archive_project(
+                session, project_id=test_project_crud.id
+            )
 
             assert result is not None
             assert result.status == ProjectStatus.ARCHIVED
@@ -359,11 +382,15 @@ class TestProjectSpecialMethods:
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
         async with AsyncTestingSessionLocal() as session:
-            result = await project_crud.archive_project(session, project_id=uuid.uuid4())
+            result = await project_crud.archive_project(
+                session, project_id=uuid.uuid4()
+            )
             assert result is None
 
     @pytest.mark.asyncio
-    async def test_get_projects_by_owner(self, async_test_db, test_owner_crud, test_project_crud):
+    async def test_get_projects_by_owner(
+        self, async_test_db, test_owner_crud, test_project_crud
+    ):
         """Test getting all projects by owner."""
         _test_engine, AsyncTestingSessionLocal = async_test_db
 
@@ -377,7 +404,9 @@ class TestProjectSpecialMethods:
             assert all(p.owner_id == test_owner_crud.id for p in projects)
 
     @pytest.mark.asyncio
-    async def test_get_projects_by_owner_with_status(self, async_test_db, test_owner_crud):
+    async def test_get_projects_by_owner_with_status(
+        self, async_test_db, test_owner_crud
+    ):
         """Test getting projects by owner filtered by status."""
         _test_engine, AsyncTestingSessionLocal = async_test_db