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_issue.py

@@ -3,13 +3,13 @@
 
 import uuid
 from datetime import UTC, datetime
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 import pytest_asyncio
 from sqlalchemy.exc import IntegrityError, OperationalError
 
-from app.crud.syndarix.issue import CRUDIssue, issue
+from app.crud.syndarix.issue import issue
 from app.models.syndarix import Issue, Project, Sprint
 from app.models.syndarix.enums import (
     IssuePriority,
@@ -18,7 +18,7 @@ from app.models.syndarix.enums import (
     SprintStatus,
     SyncStatus,
 )
-from app.schemas.syndarix import IssueCreate, IssueUpdate
+from app.schemas.syndarix import IssueCreate
 
 
 @pytest_asyncio.fixture
@@ -48,6 +48,7 @@ async def test_project(db_session):
 async def test_sprint(db_session, test_project):
     """Create a test sprint."""
     from datetime import date
+
     sprint = Sprint(
         id=uuid.uuid4(),
         project_id=test_project.id,
@@ -203,7 +204,7 @@ class TestIssueGetByProject:
         await db_session.commit()
 
         # Test status filter
-        issues, total = await issue.get_by_project(
+        issues, _total = await issue.get_by_project(
             db_session,
             project_id=test_project.id,
             status=IssueStatus.IN_PROGRESS,
@@ -212,7 +213,7 @@ class TestIssueGetByProject:
         assert issues[0].status == IssueStatus.IN_PROGRESS
 
         # Test priority filter
-        issues, total = await issue.get_by_project(
+        issues, _total = await issue.get_by_project(
             db_session,
             project_id=test_project.id,
             priority=IssuePriority.HIGH,
@@ -221,12 +222,14 @@ class TestIssueGetByProject:
         assert issues[0].priority == IssuePriority.HIGH
 
     @pytest.mark.asyncio
-    @pytest.mark.skip(reason="Labels filter uses PostgreSQL @> operator, not available in SQLite")
+    @pytest.mark.skip(
+        reason="Labels filter uses PostgreSQL @> operator, not available in SQLite"
+    )
     async def test_get_by_project_with_labels_filter(
         self, db_session, test_project, test_issue
     ):
         """Test getting issues filtered by labels."""
-        issues, total = await issue.get_by_project(
+        issues, _total = await issue.get_by_project(
             db_session,
             project_id=test_project.id,
             labels=["bug"],
@@ -249,7 +252,7 @@ class TestIssueGetByProject:
         db_session.add(issue2)
         await db_session.commit()
 
-        issues, total = await issue.get_by_project(
+        issues, _total = await issue.get_by_project(
             db_session,
             project_id=test_project.id,
             sort_by="created_at",
@@ -257,8 +260,16 @@ class TestIssueGetByProject:
         )
         assert len(issues) == 2
         # Compare without timezone info since DB may strip it
-        first_time = issues[0].created_at.replace(tzinfo=None) if issues[0].created_at.tzinfo else issues[0].created_at
-        second_time = issues[1].created_at.replace(tzinfo=None) if issues[1].created_at.tzinfo else issues[1].created_at
+        first_time = (
+            issues[0].created_at.replace(tzinfo=None)
+            if issues[0].created_at.tzinfo
+            else issues[0].created_at
+        )
+        second_time = (
+            issues[1].created_at.replace(tzinfo=None)
+            if issues[1].created_at.tzinfo
+            else issues[1].created_at
+        )
         assert first_time <= second_time
 
     @pytest.mark.asyncio
@@ -561,9 +572,7 @@ class TestIssueExternalTracker:
         assert len(issues) >= 1
 
         # Test with project filter
-        issues = await issue.get_pending_sync(
-            db_session, project_id=test_project.id
-        )
+        issues = await issue.get_pending_sync(db_session, project_id=test_project.id)
         assert len(issues) >= 1
 
     @pytest.mark.asyncio