// Copyright 2014 The Cayley Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package iterator

import (
	"testing"

	"github.com/google/cayley/quad"
)

func TestLinksTo(t *testing.T) {
	ts := &store{
		data: []string{1: "cool"},
		iter: newFixed(),
	}
	ts.iter.(*Fixed).Add(2)
	fixed := newFixed()
	val := ts.ValueOf("cool")
	if val != 1 {
		t.Fatalf("Failed to return correct value, got:%v expect:1", val)
	}
	fixed.Add(val)
	lto := NewLinksTo(ts, fixed, quad.Object)
	val, ok := lto.Next()
	if !ok {
		t.Error("At least one triple matches the fixed object")
	}
	if val != 2 {
		t.Errorf("Quad index 2, such as %s, should match %s", ts.Quad(2), ts.Quad(val))
	}
}
