Add Unit & Integration Tests epic with subtasks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-iam7--unit-tests-for-services-layer.md

@@ -0,0 +1,24 @@
+---
+# nuzlocke-tracker-iam7
+title: Unit tests for services layer
+status: draft
+type: task
+created_at: 2026-02-10T09:33:08Z
+updated_at: 2026-02-10T09:33:08Z
+parent: nuzlocke-tracker-yzpb
+---
+
+Write unit tests for the business logic in `backend/src/app/services/`. Currently this is the `families.py` service which handles Pokemon evolution family resolution.
+
+## Checklist
+
+- [ ] Test family resolution with simple linear evolution chains (e.g. A → B → C)
+- [ ] Test family resolution with branching evolutions (e.g. Eevee)
+- [ ] Test family resolution with region-specific evolutions
+- [ ] Test edge cases: single-stage Pokemon, circular references (if possible), missing data
+
+## Notes
+
+- `services/families.py` contains the core logic for resolving Pokemon evolution families
+- These tests may need mock database sessions or in-memory data depending on how the service queries data
+- If the service methods take a DB session, mock it; if they operate on data objects, pass test data directly