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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package bloombits
import (
"bytes"
"math/rand"
"testing"
"github.com/ethereum/go-ethereum/core/types"
)
// Tests that batched bloom bits are correctly rotated from the input bloom
// filters.
func TestGenerator(t *testing.T) {
// Generate the input and the rotated output
var input, output [types.BloomBitLength][types.BloomByteLength]byte
for i := 0; i < types.BloomBitLength; i++ {
for j := 0; j < types.BloomBitLength; j++ {
bit := byte(rand.Int() % 2)
input[i][j/8] |= bit << byte(7-j%8)
output[types.BloomBitLength-1-j][i/8] |= bit << byte(7-i%8)
}
}
// Crunch the input through the generator and verify the result
gen, err := NewGenerator(types.BloomBitLength)
if err != nil {
t.Fatalf("failed to create bloombit generator: %v", err)
}
for i, bloom := range input {
if err := gen.AddBloom(bloom); err != nil {
t.Fatalf("bloom %d: failed to add: %v", i, err)
}
}
for i, want := range output {
have, err := gen.Bitset(uint(i))
if err != nil {
t.Fatalf("output %d: failed to retrieve bits: %v", i, err)
}
if !bytes.Equal(have, want[:]) {
t.Errorf("output %d: bit vector mismatch have %x, want %x", i, have, want)
}
}
}
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