# Test Design: Epic 4 - Power User Settings - BYOD & Configuration

**Date:** 2026-01-24
**Author:** Max
**Status:** **Approved** (Verification Failed)

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## Executive Summary

**Scope:** Epic-Level test design for Epic 4 (BYOD & Configuration). Focus on security of API keys and reliability of provider connections.

**Risk Summary:**

- Total risks identified: 4
- High-priority risks (≥6): 2
- Critical categories: SEC, TECH

**Verification Status:**
- **Exploratory Validation (P0):** FAILED ❌
- **Reason:** P0 Tests (Provider Switching, Key Security) failed in automation due to accessibility selector mismatches (missing accessible names on inputs).
- **Action Required:** Dev team to add `aria-label` or `<label>` associations to Settings form inputs.

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## Risk Assessment

### High-Priority Risks (Score ≥6)

| Risk ID | Category | Description                                         | Probability  | Impact       | Score | Mitigation                                                                                        | Owner | Timeline |
| ------- | -------- | --------------------------------------------------- | ------------ | ------------ | ----- | ------------------------------------------------------------------------------------------------- | ----- | -------- |
| R-001   | SEC      | API Key Theft via XSS (if localStorage compromised) | 2 (Possible) | 3 (Critical) | 6     | Basic encoding (obfuscation) + Minimize 3rd party scripts. Future: Encrypt with session password. | DEV   | Sprint 4 |
| R-002   | TECH     | Browser CORS policies blocking direct API calls     | 3 (Likely)   | 2 (Degraded) | 6     | Implement optional Vercel Edge Proxy for non-CORS providers (as per Architecture).                | DEV   | Sprint 4 |

### Medium-Priority Risks (Score 3-4)

| Risk ID | Category | Description                              | Probability  | Impact       | Score | Mitigation                                                     | Owner |
| ------- | -------- | ---------------------------------------- | ------------ | ------------ | ----- | -------------------------------------------------------------- | ----- |
| R-003   | BUS      | Invalid credentials causing chat failure | 3 (Likely)   | 1 (Minor)    | 3     | Story 4.2 "Connection Validation" (Hello check) before saving. | DEV   |
| R-004   | DATA     | Loss of settings on browser cache clear  | 2 (Possible) | 2 (Degraded) | 4     | Accept risk for MVP (Local-First constraint).                  | PM    |

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## Test Coverage Plan

### P0 (Critical) - Run on every commit

**Criteria**: Blocks core functionality (chat) + High Risk (Security/CORS).

| Requirement           | Test Level | Risk Link | Test Count | Owner | Notes                                                     |
| --------------------- | ---------- | --------- | ---------- | ----- | --------------------------------------------------------- |
| Provider Switching    | E2E        | R-002     | 1          | QA    | Verify requests routed to correct Base URL.               |
| Key Storage Security  | Unit       | R-001     | 1          | DEV   | Verify keys are encoded in localStorage (not plain text). |
| Connection Validation | API (Mock) | R-003     | 1          | DEV   | Verify validation fails gracefully for invalid keys.      |

**Total P0**: 3 tests, 6 hours

### P1 (High) - Run on PR to main

**Criteria**: Important configuration features.

| Requirement           | Test Level | Risk Link | Test Count | Owner | Notes                                            |
| --------------------- | ---------- | --------- | ---------- | ----- | ------------------------------------------------ |
| Settings Persistence  | Component  | R-004     | 2          | DEV   | Verify settings survive reload.                  |
| Model Selection       | Unit       | -         | 2          | DEV   | Verify model-specific parameters/payloads.       |
| Default Configuration | Unit       | -         | 1          | DEV   | Verify defaults applied when no custom settings. |

**Total P1**: 5 tests, 5 hours

### P2 (Medium) - Run nightly/weekly

**Criteria**: UI polish and edge cases.

| Requirement             | Test Level | Risk Link | Test Count | Owner | Notes                                         |
| ----------------------- | ---------- | --------- | ---------- | ----- | --------------------------------------------- |
| UI Field Validation     | Component  | -         | 4          | DEV   | Empty fields, malformed URLs.                 |
| Provider List Rendering | Component  | -         | 2          | DEV   | Verify list updates when adding new provider. |

**Total P2**: 6 tests, 3 hours

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## Quality Gate Criteria

### Pass/Fail Thresholds

- **P0 pass rate**: 100%
- **P1 pass rate**: ≥95%
- **High-risk mitigations**: R-001 (Encoding) and R-002 (CORS/Proxy plan) must be implemented.

### Coverage Targets

- **Security scenarios** (Key storage): 100%

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## Mitigation Plans

### R-001: API Key Theft via XSS (Score: 6)

**Mitigation Strategy:** Implement basic encoding for keys in `localStorage` to prevent casual shoulder-surfing or simple grep attacks. Minimize use of third-party scripts to reduce XSS surface.
**Owner:** DEV
**Timeline:** Sprint 4 Implementation
**Status:** Planned
**Verification:** Inspect `localStorage` during P0 test; verify key is not human-readable.

### R-002: Browser CORS blocking (Score: 6)
**Mitigation Strategy:** Provide optional "Proxy Mode" configuration.
**Owner:** DEV
**Timeline:** Sprint 4 Implementation
**Status:** Planned
**Verification:** P0 E2E test verifying proxy routing when enabled.

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**Workflow**: `_bmad/bmm/testarch/test-design`