75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package chunkenc
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestBstream_Reset(t *testing.T) {
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bs := bstream{
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stream: []byte("test"),
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count: 10,
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}
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bs.Reset([]byte("was reset"))
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require.Equal(t, bstream{
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stream: []byte("was reset"),
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count: 0,
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}, bs)
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}
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func TestBstreamReader(t *testing.T) {
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// Write to the bit stream.
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w := bstream{}
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for _, bit := range []bit{true, false} {
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w.writeBit(bit)
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}
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for nbits := 1; nbits <= 64; nbits++ {
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w.writeBits(uint64(nbits), nbits)
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}
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for v := 1; v < 10000; v += 123 {
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w.writeBits(uint64(v), 29)
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}
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// Read back.
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r := newBReader(w.bytes())
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for _, bit := range []bit{true, false} {
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v, err := r.readBitFast()
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if err != nil {
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v, err = r.readBit()
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}
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require.NoError(t, err)
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require.Equal(t, bit, v)
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}
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for nbits := uint8(1); nbits <= 64; nbits++ {
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v, err := r.readBitsFast(nbits)
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if err != nil {
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v, err = r.readBits(nbits)
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}
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require.NoError(t, err)
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require.Equal(t, uint64(nbits), v, "nbits=%d", nbits)
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}
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for v := 1; v < 10000; v += 123 {
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actual, err := r.readBitsFast(29)
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if err != nil {
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actual, err = r.readBits(29)
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}
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require.NoError(t, err)
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require.Equal(t, uint64(v), actual, "v=%d", v)
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}
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}
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