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[#122] Add precision converter

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Signed-off-by: Alex Vanin <alexey@nspcc.ru>
This commit is contained in:
Alex Vanin 2020-10-27 13:25:16 +03:00 • committed by Alex Vanin
parent b93c146824
commit 7db40eafe0
2 changed files with 182 additions and 0 deletions
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89
pkg/util/precision/converter_test.go Normal file
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package precision_test
import (
"math/big"
"testing"
"github.com/nspcc-dev/neofs-node/pkg/util/precision"
"github.com/stretchr/testify/require"
)
func TestFixed8Converter_ToBalancePrecision(t *testing.T) {
var n int64 = 100*100_000_000 + 12_345_678
t.Run("same precision", func(t *testing.T) {
cnv := precision.NewConverter(8)
res := cnv.ToBalancePrecision(n)
require.Equal(t, n, res)
})
t.Run("bigger target", func(t *testing.T) {
cnv := precision.NewConverter(10)
exp := n * 100
res := cnv.ToBalancePrecision(n)
require.Equal(t, exp, res)
})
t.Run("less target", func(t *testing.T) {
cnv := precision.NewConverter(6)
exp := n / 100
res := cnv.ToBalancePrecision(n)
require.Equal(t, exp, res)
cnv = precision.NewConverter(0)
exp = n / 100_000_000
res = cnv.ToBalancePrecision(n)
require.Equal(t, exp, res)
})
}
func TestFixed8Converter_ToFixed8(t *testing.T) {
var n int64 = 100*10_000_000 + 12_345_678
t.Run("same precision", func(t *testing.T) {
cnv := precision.NewConverter(8)
res := cnv.ToFixed8(n)
require.Equal(t, n, res)
})
t.Run("bigger target", func(t *testing.T) {
cnv := precision.NewConverter(10)
exp := n / 100
res := cnv.ToFixed8(n)
require.Equal(t, exp, res)
})
t.Run("less target", func(t *testing.T) {
cnv := precision.NewConverter(6)
exp := n * 100
res := cnv.ToFixed8(n)
require.Equal(t, exp, res)
n = 1
cnv = precision.NewConverter(0)
exp = n * 100_000_000
res = cnv.ToFixed8(n)
require.Equal(t, exp, res)
})
}
func TestConvert(t *testing.T) {
n := big.NewInt(100*10_000_000 + 12_345_678)
t.Run("same precision", func(t *testing.T) {
require.Equal(t, n, precision.Convert(8, 8, n))
require.Equal(t, n, precision.Convert(0, 0, n))
})
t.Run("bigger target", func(t *testing.T) {
exp := new(big.Int).Mul(n, big.NewInt(100))
require.Equal(t, exp, precision.Convert(8, 10, n))
require.Equal(t, exp, precision.Convert(0, 2, n))
})
t.Run("less target", func(t *testing.T) {
exp := new(big.Int).Div(n, big.NewInt(100))
require.Equal(t, exp, precision.Convert(10, 8, n))
require.Equal(t, exp, precision.Convert(2, 0, n))
})
}