mirror of
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53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
// Copyright 2016 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 local
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import "testing"
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func TestCountBits(t *testing.T) {
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for i := byte(0); i < 56; i++ {
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for j := byte(0); j <= 8; j++ {
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for k := byte(0); k < 8; k++ {
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p := uint64(bitMask[j][k]) << i
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gotLeading, gotSignificant := countBits(p)
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wantLeading := 56 - i + k
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wantSignificant := j
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if j+k > 8 {
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wantSignificant -= j + k - 8
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}
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if wantLeading > 31 {
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wantSignificant += wantLeading - 31
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wantLeading = 31
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}
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if p == 0 {
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wantLeading = 0
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wantSignificant = 0
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}
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if wantLeading != gotLeading {
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t.Errorf(
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"unexpected leading bit count for i=%d, j=%d, k=%d; want %d, got %d",
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i, j, k, wantLeading, gotLeading,
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)
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}
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if wantSignificant != gotSignificant {
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t.Errorf(
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"unexpected significant bit count for i=%d, j=%d, k=%d; want %d, got %d",
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i, j, k, wantSignificant, gotSignificant,
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)
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}
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}
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}
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}
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}
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