Bugfix

internal/knowledge/store_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -50,3 +51,38 @@ func TestLoadRequiresSourceMetadata(t *testing.T) {
 		t.Fatal("expected missing source to fail")
 	}
 }
+
+func TestLoadMissingDirectoryReturnsHelpfulError(t *testing.T) {
+	missing := filepath.Join(t.TempDir(), "does-not-exist")
+	_, err := Load(context.Background(), missing, t.TempDir(), nil, false, []string{"internal-kb"})
+	if err == nil {
+		t.Fatal("expected missing knowledge directory to fail")
+	}
+	if got := err.Error(); !strings.Contains(got, "read knowledge directory") || !strings.Contains(got, missing) {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestNilStoreHelpersDoNotPanic(t *testing.T) {
+	var s *Store
+	if got := s.Count(); got != 0 {
+		t.Fatalf("Count()=%d, want 0", got)
+	}
+	if _, ok := s.ByID("KB1"); ok {
+		t.Fatal("nil store unexpectedly returned a document")
+	}
+	if _, err := s.Search(context.Background(), "vpn", 1); err == nil {
+		t.Fatal("expected Search on nil store to return an error")
+	}
+}
+
+func TestRAGRequiresEmbedderWhenDocumentsExist(t *testing.T) {
+	dir := t.TempDir()
+	doc := `{"id":"I1","title":"VPN intern","text":"gateway vpn","answer":"x","source":"internal-kb","language":"de-DE","communication_style":"formal"}`
+	if err := os.WriteFile(filepath.Join(dir, "internal.json"), []byte(doc), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := Load(context.Background(), dir, t.TempDir(), nil, true, []string{"internal-kb"}); err == nil {
+		t.Fatal("expected RAG without embedder to fail")
+	}
+}