feat(phase-30): add coverage snapshots, temporal comparison and auto re-testing (T-230 to T-232)

backend/app/routers/tests.py

@@ -52,6 +52,8 @@ from app.services.test_workflow_service import (
     validate_as_red_lead as wf_validate_red,
     validate_as_blue_lead as wf_validate_blue,
     reopen_test as wf_reopen,
+    handle_remediation_completed as wf_handle_remediation,
+    get_retest_chain as wf_get_retest_chain,
 )
 
 router = APIRouter(prefix="/tests", tags=["tests"])
@@ -546,9 +548,15 @@ def update_remediation(
     db: Session = Depends(get_db),
     current_user: User = Depends(get_current_user),
 ):
-    """Update remediation fields on a test (any authenticated user)."""
+    """Update remediation fields on a test (any authenticated user).
+
+    When ``remediation_status`` transitions to ``'completed'``, an automatic
+    re-test is created (subject to ``MAX_RETEST_COUNT``).
+    """
     test = _get_test_or_404(db, test_id)
 
+    old_remediation_status = test.remediation_status
+
     update_data = payload.model_dump(exclude_unset=True)
     for field, value in update_data.items():
         setattr(test, field, value)
@@ -565,6 +573,13 @@ def update_remediation(
         details={"updated_fields": list(update_data.keys())},
     )
 
+    # Auto-create retest when remediation is marked completed
+    new_status = update_data.get("remediation_status")
+    if new_status == "completed" and old_remediation_status != "completed":
+        retest = wf_handle_remediation(db, test, current_user)
+        if retest:
+            db.refresh(test)
+
     return test
 
 
@@ -603,3 +618,35 @@ def get_test_timeline(
         }
         for log in logs
     ]
+
+
+# ---------------------------------------------------------------------------
+# GET /tests/{id}/retest-chain  —  full retest chain
+# ---------------------------------------------------------------------------
+
+
+@router.get("/{test_id}/retest-chain")
+def get_retest_chain(
+    test_id: uuid.UUID,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Return the full chain of retests (original + all retests) for a test."""
+    chain = wf_get_retest_chain(db, test_id)
+    if not chain:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Test not found")
+
+    return [
+        {
+            "id": str(t.id),
+            "name": t.name,
+            "state": t.state.value if t.state else None,
+            "retest_of": str(t.retest_of) if t.retest_of else None,
+            "retest_count": t.retest_count,
+            "result": t.result.value if t.result else None,
+            "detection_result": t.detection_result.value if t.detection_result else None,
+            "remediation_status": t.remediation_status,
+            "created_at": t.created_at.isoformat() if t.created_at else None,
+        }
+        for t in chain
+    ]