// Copyright 2017 Pilosa Corp.
//
// 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 roaring

import (
	"reflect"
	"testing"
)

// Ensure iterator returns values from a bitmap.
func TestBitmapIterator(t *testing.T) {
	for i, tt := range []struct {
		bitmap []uint64
		values []uint32
	}{
		// Empty
		{
			bitmap: []uint64{6}, // 0110
			values: []uint32{1, 2},
		},

		// Single uint64 bitmap
		{
			bitmap: []uint64{6}, // 0110
			values: []uint32{1, 2},
		},

		// Multi uint64 bitmap
		{
			bitmap: []uint64{1 << 63, 1, 0, 1, 3 << 62},
			values: []uint32{63, 64, 192, 318, 319},
		},
	} {
		itr := newBitmapIterator(tt.bitmap)

		var a []uint32
		for v, eof := itr.next(); !eof; v, eof = itr.next() {
			a = append(a, v)
		}

		if !reflect.DeepEqual(a, tt.values) {
			t.Errorf("%d. unexpected values: exp=%+v, got=%+v", i, a, tt.values)
		}
	}
}