test: tests para insert, get, FTS search, purge y drop

5 tests que validan el flujo completo del registry:
- Insert y Get de funciones con tags y campos correctos
- Insert y Get de tipos algebraicos
- Busqueda FTS con filtros combinados (purity, domain)
- Purge limpia ambas tablas
- Drop elimina el archivo de BD

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

registry/store_test.go

@@ -0,0 +1,168 @@
+package registry
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func tempDB(t *testing.T) *DB {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "test.db")
+	db, err := Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { db.Close() })
+	return db
+}
+
+func TestInsertAndGetFunction(t *testing.T) {
+	db := tempDB(t)
+
+	f := &Function{
+		Name:        "filter_slice",
+		Kind:        KindFunction,
+		Lang:        "go",
+		Domain:      "core",
+		Version:     "1.0.0",
+		Purity:      PurityPure,
+		Signature:   "func FilterSlice[T any](xs []T, pred func(T) bool) []T",
+		Description: "Filtra un slice con un predicado sin mutar el original",
+		Tags:        []string{"slice", "functional", "generic"},
+		FilePath:    "functions/core/filter_slice.go",
+	}
+
+	if err := db.InsertFunction(f); err != nil {
+		t.Fatal(err)
+	}
+
+	if f.ID != "filter_slice_go_core" {
+		t.Fatalf("expected ID filter_slice_go_core, got %s", f.ID)
+	}
+
+	got, err := db.GetFunction("filter_slice_go_core")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if got.Name != "filter_slice" {
+		t.Errorf("name: got %q, want %q", got.Name, "filter_slice")
+	}
+	if got.Purity != PurityPure {
+		t.Errorf("purity: got %q, want %q", got.Purity, PurityPure)
+	}
+	if len(got.Tags) != 3 {
+		t.Errorf("tags: got %d, want 3", len(got.Tags))
+	}
+}
+
+func TestInsertAndGetType(t *testing.T) {
+	db := tempDB(t)
+
+	typ := &Type{
+		Name:      "ohlcv",
+		Lang:      "go",
+		Domain:    "finance",
+		Version:   "1.0.0",
+		Algebraic: AlgebraicProduct,
+		Definition: `type OHLCV struct {
+	Open, High, Low, Close, Volume float64
+}`,
+		Description: "Vela de mercado con precios OHLCV",
+		Tags:        []string{"finance", "market", "candle"},
+		FilePath:    "types/finance/ohlcv.go",
+	}
+
+	if err := db.InsertType(typ); err != nil {
+		t.Fatal(err)
+	}
+
+	got, err := db.GetType("ohlcv_go_finance")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if got.Algebraic != AlgebraicProduct {
+		t.Errorf("algebraic: got %q, want %q", got.Algebraic, AlgebraicProduct)
+	}
+}
+
+func TestSearchFunctionsFTS(t *testing.T) {
+	db := tempDB(t)
+
+	fns := []*Function{
+		{Name: "filter_slice", Kind: KindFunction, Lang: "go", Domain: "core", Purity: PurityPure, Description: "Filtra un slice con un predicado", Version: "1.0.0"},
+		{Name: "map_slice", Kind: KindFunction, Lang: "go", Domain: "core", Purity: PurityPure, Description: "Transforma cada elemento de un slice", Version: "1.0.0"},
+		{Name: "fetch_ticks", Kind: KindFunction, Lang: "go", Domain: "io", Purity: PurityImpure, Description: "Obtiene ticks de un exchange", ErrorType: "error_go_core", Version: "1.0.0"},
+	}
+	for _, f := range fns {
+		if err := db.InsertFunction(f); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	// FTS search
+	results, err := db.SearchFunctions("slice", "", "", "", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(results) != 2 {
+		t.Errorf("FTS 'slice': got %d results, want 2", len(results))
+	}
+
+	// Filter by purity
+	results, err = db.SearchFunctions("", "", PurityImpure, "", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(results) != 1 || results[0].Name != "fetch_ticks" {
+		t.Errorf("filter impure: unexpected results %v", results)
+	}
+
+	// Filter by domain
+	results, err = db.SearchFunctions("", "", "", "", "core")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(results) != 2 {
+		t.Errorf("filter domain=core: got %d, want 2", len(results))
+	}
+}
+
+func TestPurge(t *testing.T) {
+	db := tempDB(t)
+
+	db.InsertFunction(&Function{Name: "test_fn", Kind: KindFunction, Lang: "go", Domain: "core", Purity: PurityPure, Description: "test", Version: "1.0.0"})
+	db.InsertType(&Type{Name: "test_type", Lang: "go", Domain: "core", Algebraic: AlgebraicProduct, Description: "test", Version: "1.0.0"})
+
+	if err := db.Purge(); err != nil {
+		t.Fatal(err)
+	}
+
+	fns, _ := db.SearchFunctions("", "", "", "", "")
+	if len(fns) != 0 {
+		t.Errorf("after purge: got %d functions, want 0", len(fns))
+	}
+
+	ts, _ := db.SearchTypes("", "", "")
+	if len(ts) != 0 {
+		t.Errorf("after purge: got %d types, want 0", len(ts))
+	}
+}
+
+func TestDrop(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "drop.db")
+	db, err := Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := db.Drop(); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := os.Stat(path); !os.IsNotExist(err) {
+		t.Error("db file should not exist after Drop")
+	}
+}