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util_test.go
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util_test.go
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package hll
import (
"fmt"
"math"
"testing"
"github.com/stretchr/testify/assert"
)
func Test_divideBy8RoundUp(t *testing.T) {
assert.Equal(t, 0, divideBy8RoundUp(0))
assert.Equal(t, 1, divideBy8RoundUp(1))
assert.Equal(t, 1, divideBy8RoundUp(7))
assert.Equal(t, 1, divideBy8RoundUp(8))
assert.Equal(t, 2, divideBy8RoundUp(9))
assert.Equal(t, 8, divideBy8RoundUp(64))
assert.Equal(t, 9, divideBy8RoundUp(65))
}
func Test_readWriteBits(t *testing.T) {
numSamples := 1000
for nBits := 1; nBits < 64; nBits++ {
mask := uint64((1 << uint(nBits)) - 1)
// test from i = 0 to i = 1000...makes sure handling of lower bits is correct.
t.Run(fmt.Sprintf("Ascending-%d", nBits), func(t *testing.T) {
bytes := make([]byte, divideBy8RoundUp(nBits*numSamples))
for i := 0; i < numSamples; i++ {
writeBits(bytes, i*nBits, uint64(i), nBits)
}
for i := 0; i < numSamples; i++ {
assert.Equal(t, uint64(i)&mask, readBits(bytes, i*nBits, nBits), "i == %d", i)
}
})
// test from i = MAX to i = MAX - 1000...makes sure handling of upper bits is correct
t.Run(fmt.Sprintf("Descending-%d", nBits), func(t *testing.T) {
bytes := make([]byte, divideBy8RoundUp(nBits*numSamples))
for i := 0; i < numSamples; i++ {
writeBits(bytes, i*nBits, math.MaxUint64-uint64(i), nBits)
}
for i := 0; i < numSamples; i++ {
assert.Equal(t, (math.MaxInt64-uint64(i))&mask, readBits(bytes, i*nBits, nBits), "i == %d", i)
}
})
}
}