semantic-memory-mcp/docs/PHASE_2_TDD_SUMMARY.md

Phase 2 TDD Summary - REST API Implementation

🎯 Current Test Status

Total Tests: 17 tests (12 passing + 5 new API tests)

✅ Passing Tests (14 total)

Core Infrastructure (12 tests):

• 3 Auth tests (JWT functionality)
• 4 Memory service structure tests
• 2 Memory service integration tests
• 3 Memory operations tests (placeholders)

API Endpoints (2 tests):

• ✅ test_health_endpoint - Health check working
• ✅ test_invalid_route_returns_404 - Proper 404 handling

❌ Failing Tests (3 tests) - These Guide Implementation

API Endpoints needing implementation:

1. test_add_fact_endpoint - POST /api/facts

   • Expected: Should accept JSON and return 201
   • Current: Returns error (endpoint not implemented)
   • Action: Implement fact creation endpoint

2. test_search_facts_endpoint - GET /api/facts/search

   • Expected: Should return search results with 200
   • Current: Returns error (endpoint not implemented)
   • Action: Implement search endpoint

3. test_malformed_json_returns_400 - Error handling

   • Expected: Should return 400 for bad JSON
   • Current: Returns 404 (wrong error type)
   • Action: Fix error handling middleware

📋 Implementation Plan (TDD-Driven)

Step 1: Implement API Handlers

Files to create/modify:

src/api/handlers.rs       # Request handlers
src/api/rest.rs           # REST endpoint definitions

Endpoints to implement:

// POST /api/facts
async fn add_fact(
    service: web::Data<MemoryService>,
    payload: web::Json<FactRequest>
) -> Result<HttpResponse, ServerError> {
    // TODO: Implement fact creation
}

// GET /api/facts/search
async fn search_facts(
    service: web::Data<MemoryService>,
    query: web::Query<SearchParams>
) -> Result<HttpResponse, ServerError> {
    // TODO: Implement search
}

Step 2: Update API Configuration

File: src/api/config.rs

pub fn configure_api(cfg: &mut web::ServiceConfig) {
    cfg.service(
        web::scope("/api")
            .route("/health", web::get().to(health_check))
            .route("/facts", web::post().to(add_fact))
            .route("/facts/search", web::get().to(search_facts))
    );
}

Step 3: Implement Request/Response Types

File: src/api/types.rs (new)

use serde::{Deserialize, Serialize};

#[derive(Deserialize)]
pub struct FactRequest {
    pub namespace: String,
    pub content: String,
}

#[derive(Deserialize)]
pub struct SearchParams {
    pub q: String,
    pub limit: Option<usize>,
}

#[derive(Serialize)]
pub struct FactResponse {
    pub id: String,
    pub namespace: String,
    pub content: String,
    pub created_at: String,
}

Step 4: Implement Memory Service Operations

File: src/memory/service.rs (expand)

impl MemoryService {
    // ... existing code ...
    
    pub async fn add_fact(
        &self,
        namespace: &str,
        content: &str
    ) -> Result<Fact> {
        let store = self.get_store();
        // TODO: Use semantic-memory to add fact
    }
    
    pub async fn search_facts(
        &self,
        query: &str,
        limit: usize
    ) -> Result<Vec<Fact>> {
        let store = self.get_store();
        // TODO: Use semantic-memory to search
    }
}

Step 5: Fix Error Handling

File: src/error.rs (expand)

impl From<actix_web::error::JsonPayloadError> for ServerError {
    fn from(err: actix_web::error::JsonPayloadError) -> Self {
        ServerError::ApiError(err.to_string())
    }
}

🎯 Expected Test Results After Implementation

Test	Current Status	Expected Status
test_health_endpoint	✅ PASS	✅ PASS
test_invalid_route_returns_404	✅ PASS	✅ PASS
test_add_fact_endpoint	❌ FAIL	✅ PASS
test_search_facts_endpoint	❌ FAIL	✅ PASS
test_malformed_json_returns_400	❌ FAIL	✅ PASS

Final: 5/5 API tests passing

🚀 Next Steps

1. Implement API handlers in src/api/handlers.rs
2. Update API routing in src/api/config.rs
3. Add request/response types in src/api/types.rs
4. Expand memory service operations
5. Fix error handling for JSON parsing
6. Run tests to verify implementation

📁 Files to Create/Modify

📁 src/api/
├── types.rs          # NEW: Request/Response types
├── handlers.rs       # NEW: API handlers
└── config.rs         # MODIFY: Add new routes

📁 src/memory/
└── service.rs        # MODIFY: Add operations

📁 src/
└── error.rs          # MODIFY: Add error conversions

✅ TDD Compliance

• Tests written first ✅
• Tests describe expected behavior ✅
• Failing tests guide implementation ✅
• Clear implementation path ✅
• All tests will remain permanent ✅

The failing tests perfectly illustrate the TDD process - they tell us exactly what functionality is missing and what the expected behavior should be.