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hyperguild/ingestion/internal/mcp/server_test.go
Mathias 2726896079
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feat(mcp): wire brain_context tool
Returns top-N relevant brain entries for a project context. Combines
BM25 hits on project name with 2-hop graph expansion via Track A's
graphstore (when BRAIN_GRAPH_ENABLED). Closes hyperguild#28.

Notes on implementation choices that deviate slightly from the spec:
- Excerpt length: 200 chars per spec (vs the 300 used by search.Result).
  truncateExcerpt clamps the already-stripped BM25 excerpt; graph-only
  neighbours load their excerpt from disk via a private readExcerpt
  helper (search.hydrate is unexported).
- Graph scoring: 0.6 / max(1, distance) per neighbour, so distance-1
  contributes 0.6 and distance-2 contributes 0.3. BM25 hits decay
  linearly from 3.0 (rank-0) to 1.0 (rank-2), giving BM25 hits a
  natural ceiling above pure-graph hits while still letting a doc
  surfaced via both edge types outrank a BM25-only one.
- Test placement: package mcp (internal) rather than mcp_test, because
  graphReader is unexported and WithGraph only accepts *PGStore; an
  internal test can install a dual-interface fake directly on s.graph
  without spinning up postgres.

Bump-Type: minor

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-25 18:53:14 +02:00

95 lines
2.7 KiB
Go

package mcp_test
import (
"bytes"
"encoding/json"
"net/http"
"net/http/httptest"
"strings"
"testing"
"github.com/mathiasbq/hyperguild/ingestion/internal/mcp"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func body(t *testing.T, v any) *bytes.Buffer {
t.Helper()
b, err := json.Marshal(v)
require.NoError(t, err)
return bytes.NewBuffer(b)
}
func TestServerInitialize(t *testing.T) {
srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
"jsonrpc": "2.0", "id": 1, "method": "initialize",
"params": map[string]any{},
}))
rr := httptest.NewRecorder()
srv.ServeHTTP(rr, req)
assert.Equal(t, http.StatusOK, rr.Code)
var resp map[string]any
require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
result := resp["result"].(map[string]any)
assert.Equal(t, "2024-11-05", result["protocolVersion"])
}
func TestServerToolsList(t *testing.T) {
srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
"jsonrpc": "2.0", "id": 2, "method": "tools/list",
}))
rr := httptest.NewRecorder()
srv.ServeHTTP(rr, req)
assert.Equal(t, http.StatusOK, rr.Code)
var resp map[string]any
require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
tools := resp["result"].(map[string]any)["tools"].([]any)
names := make([]string, 0, len(tools))
for _, t := range tools {
names = append(names, t.(map[string]any)["name"].(string))
}
assert.ElementsMatch(t, []string{
"brain_query", "brain_write", "brain_index", "brain_tunnel",
"brain_ingest_raw", "brain_ingest",
"brain_answer", "brain_classify", "brain_graph", "brain_context",
"session_log",
}, names)
}
func TestServerNotificationGetsNoBody(t *testing.T) {
srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
"jsonrpc": "2.0", "method": "notifications/initialized",
}))
rr := httptest.NewRecorder()
srv.ServeHTTP(rr, req)
assert.Equal(t, http.StatusOK, rr.Code)
assert.Empty(t, strings.TrimSpace(rr.Body.String()))
}
func TestServerUnknownMethodReturnsError(t *testing.T) {
srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
"jsonrpc": "2.0", "id": 3, "method": "unknown/method",
}))
rr := httptest.NewRecorder()
srv.ServeHTTP(rr, req)
assert.Equal(t, http.StatusOK, rr.Code)
var resp map[string]any
require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
require.NotNil(t, resp["error"])
errObj := resp["error"].(map[string]any)
assert.Equal(t, float64(-32601), errObj["code"])
assert.Contains(t, errObj["message"].(string), "unknown/method")
}