package store

import (
	"context"
	"testing"
)

// Empty lists must serialize as JSON [] (non-nil slice), not null,
// otherwise the frontend crashes on `.length`/`.map`. Regression for
// "Uncaught TypeError: can't access property length, n is null".
func TestListsNeverNilWhenEmpty(t *testing.T) {
	s := testStore(t)
	ctx := context.Background()

	eps, err := s.ListEndpoints(ctx)
	if err != nil {
		t.Fatalf("ListEndpoints: %v", err)
	}
	if eps == nil {
		t.Fatal("ListEndpoints returned nil slice on empty DB (would serialize as null)")
	}

	tasks, err := s.ListTasks(ctx)
	if err != nil {
		t.Fatalf("ListTasks: %v", err)
	}
	if tasks == nil {
		t.Fatal("ListTasks returned nil slice on empty DB (would serialize as null)")
	}

	accs, err := s.ListAccountsByTask(ctx, 999999)
	if err != nil {
		t.Fatalf("ListAccountsByTask: %v", err)
	}
	if accs == nil {
		t.Fatal("ListAccountsByTask returned nil slice for no rows (would serialize as null)")
	}
}