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decimal_test.go
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package types_test
import (
"bytes"
"encoding/json"
"fmt"
"math/big"
"testing"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
"sigs.k8s.io/yaml"
sdk "github.com/cosmos/cosmos-sdk/types"
)
type decimalTestSuite struct {
suite.Suite
}
func TestDecimalTestSuite(t *testing.T) {
suite.Run(t, new(decimalTestSuite))
}
func TestDecApproxEq(t *testing.T) {
// d1 = 0.55, d2 = 0.6, tol = 0.1
d1 := sdk.NewDecWithPrec(55, 2)
d2 := sdk.NewDecWithPrec(6, 1)
tol := sdk.NewDecWithPrec(1, 1)
require.True(sdk.DecApproxEq(t, d1, d2, tol))
// d1 = 0.55, d2 = 0.6, tol = 1E-5
d1 = sdk.NewDecWithPrec(55, 2)
d2 = sdk.NewDecWithPrec(6, 1)
tol = sdk.NewDecWithPrec(1, 5)
require.False(sdk.DecApproxEq(t, d1, d2, tol))
// d1 = 0.6, d2 = 0.61, tol = 0.01
d1 = sdk.NewDecWithPrec(6, 1)
d2 = sdk.NewDecWithPrec(61, 2)
tol = sdk.NewDecWithPrec(1, 2)
require.True(sdk.DecApproxEq(t, d1, d2, tol))
}
// create a decimal from a decimal string (ex. "1234.5678")
func (s *decimalTestSuite) mustNewDecFromStr(str string) (d sdk.Dec) {
d, err := sdk.NewDecFromStr(str)
s.Require().NoError(err)
return d
}
func (s *decimalTestSuite) TestNewDecFromStr() {
largeBigInt, ok := new(big.Int).SetString("3144605511029693144278234343371835", 10)
s.Require().True(ok)
largerBigInt, ok := new(big.Int).SetString("88888888888888888888888888888888888888888888888888888888888888888888844444440", 10)
s.Require().True(ok)
largestBigInt, ok := new(big.Int).SetString("133499189745056880149688856635597007162669032647290798121690100488888732861290034376435130433535", 10)
s.Require().True(ok)
tests := []struct {
decimalStr string
expErr bool
exp sdk.Dec
}{
{"", true, sdk.Dec{}},
{"0.-75", true, sdk.Dec{}},
{"0", false, sdk.NewDec(0)},
{"1", false, sdk.NewDec(1)},
{"1.1", false, sdk.NewDecWithPrec(11, 1)},
{"0.75", false, sdk.NewDecWithPrec(75, 2)},
{"0.8", false, sdk.NewDecWithPrec(8, 1)},
{"0.11111", false, sdk.NewDecWithPrec(11111, 5)},
{"314460551102969.3144278234343371835", true, sdk.NewDec(3141203149163817869)},
{"314460551102969314427823434337.1835718092488231350",
true, sdk.NewDecFromBigIntWithPrec(largeBigInt, 4)},
{"314460551102969314427823434337.1835",
false, sdk.NewDecFromBigIntWithPrec(largeBigInt, 4)},
{".", true, sdk.Dec{}},
{".0", true, sdk.NewDec(0)},
{"1.", true, sdk.NewDec(1)},
{"foobar", true, sdk.Dec{}},
{"0.foobar", true, sdk.Dec{}},
{"0.foobar.", true, sdk.Dec{}},
{"88888888888888888888888888888888888888888888888888888888888888888888844444440", false, sdk.NewDecFromBigInt(largerBigInt)},
{"133499189745056880149688856635597007162669032647290798121690100488888732861290.034376435130433535", false, sdk.NewDecFromBigIntWithPrec(largestBigInt, 18)},
{"133499189745056880149688856635597007162669032647290798121690100488888732861291", true, sdk.Dec{}},
}
for tcIndex, tc := range tests {
res, err := sdk.NewDecFromStr(tc.decimalStr)
if tc.expErr {
s.Require().NotNil(err, "error expected, decimalStr %v, tc %v", tc.decimalStr, tcIndex)
} else {
s.Require().Nil(err, "unexpected error, decimalStr %v, tc %v", tc.decimalStr, tcIndex)
s.Require().True(res.Equal(tc.exp), "equality was incorrect, res %v, exp %v, tc %v", res, tc.exp, tcIndex)
}
// negative tc
res, err = sdk.NewDecFromStr("-" + tc.decimalStr)
if tc.expErr {
s.Require().NotNil(err, "error expected, decimalStr %v, tc %v", tc.decimalStr, tcIndex)
} else {
s.Require().Nil(err, "unexpected error, decimalStr %v, tc %v", tc.decimalStr, tcIndex)
exp := tc.exp.Mul(sdk.NewDec(-1))
s.Require().True(res.Equal(exp), "equality was incorrect, res %v, exp %v, tc %v", res, exp, tcIndex)
}
}
}
func (s *decimalTestSuite) TestDecString() {
tests := []struct {
d sdk.Dec
want string
}{
{sdk.NewDec(0), "0.000000000000000000"},
{sdk.NewDec(1), "1.000000000000000000"},
{sdk.NewDec(10), "10.000000000000000000"},
{sdk.NewDec(12340), "12340.000000000000000000"},
{sdk.NewDecWithPrec(12340, 4), "1.234000000000000000"},
{sdk.NewDecWithPrec(12340, 5), "0.123400000000000000"},
{sdk.NewDecWithPrec(12340, 8), "0.000123400000000000"},
{sdk.NewDecWithPrec(1009009009009009009, 17), "10.090090090090090090"},
}
for tcIndex, tc := range tests {
s.Require().Equal(tc.want, tc.d.String(), "bad String(), index: %v", tcIndex)
}
}
func (s *decimalTestSuite) TestDecFloat64() {
tests := []struct {
d sdk.Dec
want float64
}{
{sdk.NewDec(0), 0.000000000000000000},
{sdk.NewDec(1), 1.000000000000000000},
{sdk.NewDec(10), 10.000000000000000000},
{sdk.NewDec(12340), 12340.000000000000000000},
{sdk.NewDecWithPrec(12340, 4), 1.234000000000000000},
{sdk.NewDecWithPrec(12340, 5), 0.123400000000000000},
{sdk.NewDecWithPrec(12340, 8), 0.000123400000000000},
{sdk.NewDecWithPrec(1009009009009009009, 17), 10.090090090090090090},
}
for tcIndex, tc := range tests {
value, err := tc.d.Float64()
s.Require().Nil(err, "error getting Float64(), index: %v", tcIndex)
s.Require().Equal(tc.want, value, "bad Float64(), index: %v", tcIndex)
s.Require().Equal(tc.want, tc.d.MustFloat64(), "bad MustFloat64(), index: %v", tcIndex)
}
}
func (s *decimalTestSuite) TestEqualities() {
tests := []struct {
d1, d2 sdk.Dec
gt, lt, eq bool
}{
{sdk.NewDec(0), sdk.NewDec(0), false, false, true},
{sdk.NewDecWithPrec(0, 2), sdk.NewDecWithPrec(0, 4), false, false, true},
{sdk.NewDecWithPrec(100, 0), sdk.NewDecWithPrec(100, 0), false, false, true},
{sdk.NewDecWithPrec(-100, 0), sdk.NewDecWithPrec(-100, 0), false, false, true},
{sdk.NewDecWithPrec(-1, 1), sdk.NewDecWithPrec(-1, 1), false, false, true},
{sdk.NewDecWithPrec(3333, 3), sdk.NewDecWithPrec(3333, 3), false, false, true},
{sdk.NewDecWithPrec(0, 0), sdk.NewDecWithPrec(3333, 3), false, true, false},
{sdk.NewDecWithPrec(0, 0), sdk.NewDecWithPrec(100, 0), false, true, false},
{sdk.NewDecWithPrec(-1, 0), sdk.NewDecWithPrec(3333, 3), false, true, false},
{sdk.NewDecWithPrec(-1, 0), sdk.NewDecWithPrec(100, 0), false, true, false},
{sdk.NewDecWithPrec(1111, 3), sdk.NewDecWithPrec(100, 0), false, true, false},
{sdk.NewDecWithPrec(1111, 3), sdk.NewDecWithPrec(3333, 3), false, true, false},
{sdk.NewDecWithPrec(-3333, 3), sdk.NewDecWithPrec(-1111, 3), false, true, false},
{sdk.NewDecWithPrec(3333, 3), sdk.NewDecWithPrec(0, 0), true, false, false},
{sdk.NewDecWithPrec(100, 0), sdk.NewDecWithPrec(0, 0), true, false, false},
{sdk.NewDecWithPrec(3333, 3), sdk.NewDecWithPrec(-1, 0), true, false, false},
{sdk.NewDecWithPrec(100, 0), sdk.NewDecWithPrec(-1, 0), true, false, false},
{sdk.NewDecWithPrec(100, 0), sdk.NewDecWithPrec(1111, 3), true, false, false},
{sdk.NewDecWithPrec(3333, 3), sdk.NewDecWithPrec(1111, 3), true, false, false},
{sdk.NewDecWithPrec(-1111, 3), sdk.NewDecWithPrec(-3333, 3), true, false, false},
}
for tcIndex, tc := range tests {
s.Require().Equal(tc.gt, tc.d1.GT(tc.d2), "GT result is incorrect, tc %d", tcIndex)
s.Require().Equal(tc.lt, tc.d1.LT(tc.d2), "LT result is incorrect, tc %d", tcIndex)
s.Require().Equal(tc.eq, tc.d1.Equal(tc.d2), "equality result is incorrect, tc %d", tcIndex)
}
}
func (s *decimalTestSuite) TestDecsEqual() {
tests := []struct {
d1s, d2s []sdk.Dec
eq bool
}{
{[]sdk.Dec{sdk.NewDec(0)}, []sdk.Dec{sdk.NewDec(0)}, true},
{[]sdk.Dec{sdk.NewDec(0)}, []sdk.Dec{sdk.NewDec(1)}, false},
{[]sdk.Dec{sdk.NewDec(0)}, []sdk.Dec{}, false},
{[]sdk.Dec{sdk.NewDec(0), sdk.NewDec(1)}, []sdk.Dec{sdk.NewDec(0), sdk.NewDec(1)}, true},
{[]sdk.Dec{sdk.NewDec(1), sdk.NewDec(0)}, []sdk.Dec{sdk.NewDec(1), sdk.NewDec(0)}, true},
{[]sdk.Dec{sdk.NewDec(1), sdk.NewDec(0)}, []sdk.Dec{sdk.NewDec(0), sdk.NewDec(1)}, false},
{[]sdk.Dec{sdk.NewDec(1), sdk.NewDec(0)}, []sdk.Dec{sdk.NewDec(1)}, false},
{[]sdk.Dec{sdk.NewDec(1), sdk.NewDec(2)}, []sdk.Dec{sdk.NewDec(2), sdk.NewDec(4)}, false},
{[]sdk.Dec{sdk.NewDec(3), sdk.NewDec(18)}, []sdk.Dec{sdk.NewDec(1), sdk.NewDec(6)}, false},
}
for tcIndex, tc := range tests {
s.Require().Equal(tc.eq, sdk.DecsEqual(tc.d1s, tc.d2s), "equality of decional arrays is incorrect, tc %d", tcIndex)
s.Require().Equal(tc.eq, sdk.DecsEqual(tc.d2s, tc.d1s), "equality of decional arrays is incorrect (converse), tc %d", tcIndex)
}
}
func (s *decimalTestSuite) TestArithmetic() {
tests := []struct {
d1, d2 sdk.Dec
expMul, expMulTruncate sdk.Dec
expQuo, expQuoRoundUp, expQuoTruncate sdk.Dec
expAdd, expSub sdk.Dec
}{
// d1 d2 MUL MulTruncate QUO QUORoundUp QUOTrunctate ADD SUB
{sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0)},
{sdk.NewDec(1), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(1), sdk.NewDec(1)},
{sdk.NewDec(0), sdk.NewDec(1), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(1), sdk.NewDec(-1)},
{sdk.NewDec(0), sdk.NewDec(-1), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(-1), sdk.NewDec(1)},
{sdk.NewDec(-1), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(0), sdk.NewDec(-1), sdk.NewDec(-1)},
{sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(2), sdk.NewDec(0)},
{sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(-2), sdk.NewDec(0)},
{sdk.NewDec(1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(0), sdk.NewDec(2)},
{sdk.NewDec(-1), sdk.NewDec(1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(-1), sdk.NewDec(0), sdk.NewDec(-2)},
{sdk.NewDec(3), sdk.NewDec(7), sdk.NewDec(21), sdk.NewDec(21),
sdk.NewDecWithPrec(428571428571428571, 18), sdk.NewDecWithPrec(428571428571428572, 18), sdk.NewDecWithPrec(428571428571428571, 18),
sdk.NewDec(10), sdk.NewDec(-4)},
{sdk.NewDec(2), sdk.NewDec(4), sdk.NewDec(8), sdk.NewDec(8), sdk.NewDecWithPrec(5, 1), sdk.NewDecWithPrec(5, 1), sdk.NewDecWithPrec(5, 1),
sdk.NewDec(6), sdk.NewDec(-2)},
{sdk.NewDec(100), sdk.NewDec(100), sdk.NewDec(10000), sdk.NewDec(10000), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(200), sdk.NewDec(0)},
{sdk.NewDecWithPrec(15, 1), sdk.NewDecWithPrec(15, 1), sdk.NewDecWithPrec(225, 2), sdk.NewDecWithPrec(225, 2),
sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(1), sdk.NewDec(3), sdk.NewDec(0)},
{sdk.NewDecWithPrec(3333, 4), sdk.NewDecWithPrec(333, 4), sdk.NewDecWithPrec(1109889, 8), sdk.NewDecWithPrec(1109889, 8),
sdk.MustNewDecFromStr("10.009009009009009009"), sdk.MustNewDecFromStr("10.009009009009009010"), sdk.MustNewDecFromStr("10.009009009009009009"),
sdk.NewDecWithPrec(3666, 4), sdk.NewDecWithPrec(3, 1)},
}
for tcIndex, tc := range tests {
tc := tc
resAdd := tc.d1.Add(tc.d2)
resSub := tc.d1.Sub(tc.d2)
resMul := tc.d1.Mul(tc.d2)
resMulTruncate := tc.d1.MulTruncate(tc.d2)
s.Require().True(tc.expAdd.Equal(resAdd), "exp %v, res %v, tc %d", tc.expAdd, resAdd, tcIndex)
s.Require().True(tc.expSub.Equal(resSub), "exp %v, res %v, tc %d", tc.expSub, resSub, tcIndex)
s.Require().True(tc.expMul.Equal(resMul), "exp %v, res %v, tc %d", tc.expMul, resMul, tcIndex)
s.Require().True(tc.expMulTruncate.Equal(resMulTruncate), "exp %v, res %v, tc %d", tc.expMulTruncate, resMulTruncate, tcIndex)
if tc.d2.IsZero() { // panic for divide by zero
s.Require().Panics(func() { tc.d1.Quo(tc.d2) })
} else {
resQuo := tc.d1.Quo(tc.d2)
s.Require().True(tc.expQuo.Equal(resQuo), "exp %v, res %v, tc %d", tc.expQuo.String(), resQuo.String(), tcIndex)
resQuoRoundUp := tc.d1.QuoRoundUp(tc.d2)
s.Require().True(tc.expQuoRoundUp.Equal(resQuoRoundUp), "exp %v, res %v, tc %d",
tc.expQuoRoundUp.String(), resQuoRoundUp.String(), tcIndex)
resQuoTruncate := tc.d1.QuoTruncate(tc.d2)
s.Require().True(tc.expQuoTruncate.Equal(resQuoTruncate), "exp %v, res %v, tc %d",
tc.expQuoTruncate.String(), resQuoTruncate.String(), tcIndex)
}
}
}
func (s *decimalTestSuite) TestBankerRoundChop() {
tests := []struct {
d1 sdk.Dec
exp int64
}{
{s.mustNewDecFromStr("0.25"), 0},
{s.mustNewDecFromStr("0"), 0},
{s.mustNewDecFromStr("1"), 1},
{s.mustNewDecFromStr("0.75"), 1},
{s.mustNewDecFromStr("0.5"), 0},
{s.mustNewDecFromStr("7.5"), 8},
{s.mustNewDecFromStr("1.5"), 2},
{s.mustNewDecFromStr("2.5"), 2},
{s.mustNewDecFromStr("0.545"), 1}, // 0.545-> 1 even though 5 is first decimal and 1 not even
{s.mustNewDecFromStr("1.545"), 2},
}
for tcIndex, tc := range tests {
resNeg := tc.d1.Neg().RoundInt64()
s.Require().Equal(-1*tc.exp, resNeg, "negative tc %d", tcIndex)
resPos := tc.d1.RoundInt64()
s.Require().Equal(tc.exp, resPos, "positive tc %d", tcIndex)
}
}
func (s *decimalTestSuite) TestTruncate() {
tests := []struct {
d1 sdk.Dec
exp int64
}{
{s.mustNewDecFromStr("0"), 0},
{s.mustNewDecFromStr("0.25"), 0},
{s.mustNewDecFromStr("0.75"), 0},
{s.mustNewDecFromStr("1"), 1},
{s.mustNewDecFromStr("1.5"), 1},
{s.mustNewDecFromStr("7.5"), 7},
{s.mustNewDecFromStr("7.6"), 7},
{s.mustNewDecFromStr("7.4"), 7},
{s.mustNewDecFromStr("100.1"), 100},
{s.mustNewDecFromStr("1000.1"), 1000},
}
for tcIndex, tc := range tests {
resNeg := tc.d1.Neg().TruncateInt64()
s.Require().Equal(-1*tc.exp, resNeg, "negative tc %d", tcIndex)
resPos := tc.d1.TruncateInt64()
s.Require().Equal(tc.exp, resPos, "positive tc %d", tcIndex)
}
}
func (s *decimalTestSuite) TestStringOverflow() {
// two random 64 bit primes
dec1, err := sdk.NewDecFromStr("51643150036226787134389711697696177267")
s.Require().NoError(err)
dec2, err := sdk.NewDecFromStr("-31798496660535729618459429845579852627")
s.Require().NoError(err)
dec3 := dec1.Add(dec2)
s.Require().Equal(
"19844653375691057515930281852116324640.000000000000000000",
dec3.String(),
)
}
func (s *decimalTestSuite) TestDecMulInt() {
tests := []struct {
sdkDec sdk.Dec
sdkInt sdk.Int
want sdk.Dec
}{
{sdk.NewDec(10), sdk.NewInt(2), sdk.NewDec(20)},
{sdk.NewDec(1000000), sdk.NewInt(100), sdk.NewDec(100000000)},
{sdk.NewDecWithPrec(1, 1), sdk.NewInt(10), sdk.NewDec(1)},
{sdk.NewDecWithPrec(1, 5), sdk.NewInt(20), sdk.NewDecWithPrec(2, 4)},
}
for i, tc := range tests {
got := tc.sdkDec.MulInt(tc.sdkInt)
s.Require().Equal(tc.want, got, "Incorrect result on test case %d", i)
}
}
func (s *decimalTestSuite) TestDecCeil() {
testCases := []struct {
input sdk.Dec
expected sdk.Dec
}{
{sdk.NewDecWithPrec(1000000000000000, sdk.Precision), sdk.NewDec(1)}, // 0.001 => 1.0
{sdk.NewDecWithPrec(-1000000000000000, sdk.Precision), sdk.ZeroDec()}, // -0.001 => 0.0
{sdk.ZeroDec(), sdk.ZeroDec()}, // 0.0 => 0.0
{sdk.NewDecWithPrec(900000000000000000, sdk.Precision), sdk.NewDec(1)}, // 0.9 => 1.0
{sdk.NewDecWithPrec(4001000000000000000, sdk.Precision), sdk.NewDec(5)}, // 4.001 => 5.0
{sdk.NewDecWithPrec(-4001000000000000000, sdk.Precision), sdk.NewDec(-4)}, // -4.001 => -4.0
{sdk.NewDecWithPrec(4700000000000000000, sdk.Precision), sdk.NewDec(5)}, // 4.7 => 5.0
{sdk.NewDecWithPrec(-4700000000000000000, sdk.Precision), sdk.NewDec(-4)}, // -4.7 => -4.0
}
for i, tc := range testCases {
res := tc.input.Ceil()
s.Require().Equal(tc.expected, res, "unexpected result for test case %d, input: %v", i, tc.input)
}
}
func (s *decimalTestSuite) TestPower() {
testCases := []struct {
input sdk.Dec
power uint64
expected sdk.Dec
}{
{sdk.NewDec(100), 0, sdk.OneDec()}, // 10 ^ (0) => 1.0
{sdk.OneDec(), 10, sdk.OneDec()}, // 1.0 ^ (10) => 1.0
{sdk.NewDecWithPrec(5, 1), 2, sdk.NewDecWithPrec(25, 2)}, // 0.5 ^ 2 => 0.25
{sdk.NewDecWithPrec(2, 1), 2, sdk.NewDecWithPrec(4, 2)}, // 0.2 ^ 2 => 0.04
{sdk.NewDecFromInt(sdk.NewInt(3)), 3, sdk.NewDecFromInt(sdk.NewInt(27))}, // 3 ^ 3 => 27
{sdk.NewDecFromInt(sdk.NewInt(-3)), 4, sdk.NewDecFromInt(sdk.NewInt(81))}, // -3 ^ 4 = 81
{sdk.NewDecWithPrec(1414213562373095049, 18), 2, sdk.NewDecFromInt(sdk.NewInt(2))}, // 1.414213562373095049 ^ 2 = 2
}
for i, tc := range testCases {
res := tc.input.Power(tc.power)
s.Require().True(tc.expected.Sub(res).Abs().LTE(sdk.SmallestDec()), "unexpected result for test case %d, normal power, input: %v", i, tc.input)
mutableInput := tc.input
mutableInput.PowerMut(tc.power)
s.Require().True(tc.expected.Sub(mutableInput).Abs().LTE(sdk.SmallestDec()),
"unexpected result for test case %d, input %v", i, tc.input)
s.Require().True(res.Equal(tc.input), "unexpected result for test case %d, mutable power, input: %v", i, tc.input)
}
}
func (s *decimalTestSuite) TestApproxRoot() {
testCases := []struct {
input sdk.Dec
root uint64
expected sdk.Dec
}{
{sdk.OneDec(), 10, sdk.OneDec()}, // 1.0 ^ (0.1) => 1.0
{sdk.NewDecWithPrec(25, 2), 2, sdk.NewDecWithPrec(5, 1)}, // 0.25 ^ (0.5) => 0.5
{sdk.NewDecWithPrec(4, 2), 2, sdk.NewDecWithPrec(2, 1)}, // 0.04 ^ (0.5) => 0.2
{sdk.NewDecFromInt(sdk.NewInt(27)), 3, sdk.NewDecFromInt(sdk.NewInt(3))}, // 27 ^ (1/3) => 3
{sdk.NewDecFromInt(sdk.NewInt(-81)), 4, sdk.NewDecFromInt(sdk.NewInt(-3))}, // -81 ^ (0.25) => -3
{sdk.NewDecFromInt(sdk.NewInt(2)), 2, sdk.NewDecWithPrec(1414213562373095049, 18)}, // 2 ^ (0.5) => 1.414213562373095049
{sdk.NewDecWithPrec(1005, 3), 31536000, sdk.MustNewDecFromStr("1.000000000158153904")}, // 1.005 ^ (1/31536000) ≈ 1.00000000016
{sdk.SmallestDec(), 2, sdk.NewDecWithPrec(1, 9)}, // 1e-18 ^ (0.5) => 1e-9
{sdk.SmallestDec(), 3, sdk.MustNewDecFromStr("0.000000999999999997")}, // 1e-18 ^ (1/3) => 1e-6
{sdk.NewDecWithPrec(1, 8), 3, sdk.MustNewDecFromStr("0.002154434690031900")}, // 1e-8 ^ (1/3) ≈ 0.00215443469
}
// In the case of 1e-8 ^ (1/3), the result repeats every 5 iterations starting from iteration 24
// (i.e. 24, 29, 34, ... give the same result) and never converges enough. The maximum number of
// iterations (100) causes the result at iteration 100 to be returned, regardless of convergence.
for i, tc := range testCases {
res, err := tc.input.ApproxRoot(tc.root)
s.Require().NoError(err)
s.Require().True(tc.expected.Sub(res).Abs().LTE(sdk.SmallestDec()), "unexpected result for test case %d, input: %v", i, tc.input)
}
}
func (s *decimalTestSuite) TestApproxSqrt() {
testCases := []struct {
input sdk.Dec
expected sdk.Dec
}{
{sdk.OneDec(), sdk.OneDec()}, // 1.0 => 1.0
{sdk.NewDecWithPrec(25, 2), sdk.NewDecWithPrec(5, 1)}, // 0.25 => 0.5
{sdk.NewDecWithPrec(4, 2), sdk.NewDecWithPrec(2, 1)}, // 0.09 => 0.3
{sdk.NewDecFromInt(sdk.NewInt(9)), sdk.NewDecFromInt(sdk.NewInt(3))}, // 9 => 3
{sdk.NewDecFromInt(sdk.NewInt(-9)), sdk.NewDecFromInt(sdk.NewInt(-3))}, // -9 => -3
{sdk.NewDecFromInt(sdk.NewInt(2)), sdk.NewDecWithPrec(1414213562373095049, 18)}, // 2 => 1.414213562373095049
}
for i, tc := range testCases {
res, err := tc.input.ApproxSqrt()
s.Require().NoError(err)
s.Require().Equal(tc.expected, res, "unexpected result for test case %d, input: %v", i, tc.input)
}
}
func (s *decimalTestSuite) TestDecSortableBytes() {
tests := []struct {
d sdk.Dec
want []byte
}{
{sdk.NewDec(0), []byte("000000000000000000.000000000000000000")},
{sdk.NewDec(1), []byte("000000000000000001.000000000000000000")},
{sdk.NewDec(10), []byte("000000000000000010.000000000000000000")},
{sdk.NewDec(12340), []byte("000000000000012340.000000000000000000")},
{sdk.NewDecWithPrec(12340, 4), []byte("000000000000000001.234000000000000000")},
{sdk.NewDecWithPrec(12340, 5), []byte("000000000000000000.123400000000000000")},
{sdk.NewDecWithPrec(12340, 8), []byte("000000000000000000.000123400000000000")},
{sdk.NewDecWithPrec(1009009009009009009, 17), []byte("000000000000000010.090090090090090090")},
{sdk.NewDecWithPrec(-1009009009009009009, 17), []byte("-000000000000000010.090090090090090090")},
{sdk.NewDec(1000000000000000000), []byte("max")},
{sdk.NewDec(-1000000000000000000), []byte("--")},
}
for tcIndex, tc := range tests {
s.Require().Equal(tc.want, sdk.SortableDecBytes(tc.d), "bad String(), index: %v", tcIndex)
}
s.Require().Panics(func() { sdk.SortableDecBytes(sdk.NewDec(1000000000000000001)) })
s.Require().Panics(func() { sdk.SortableDecBytes(sdk.NewDec(-1000000000000000001)) })
}
func (s *decimalTestSuite) TestDecEncoding() {
largestBigInt, ok := new(big.Int).SetString("133499189745056880149688856635597007162669032647290798121690100488888732861290034376435130433535", 10)
s.Require().True(ok)
smallestBigInt, ok := new(big.Int).SetString("-133499189745056880149688856635597007162669032647290798121690100488888732861290034376435130433535", 10)
s.Require().True(ok)
testCases := []struct {
input sdk.Dec
rawBz string
jsonStr string
yamlStr string
}{
{
sdk.NewDec(0), "30",
"\"0.000000000000000000\"",
"\"0.000000000000000000\"\n",
},
{
sdk.NewDecWithPrec(4, 2),
"3430303030303030303030303030303030",
"\"0.040000000000000000\"",
"\"0.040000000000000000\"\n",
},
{
sdk.NewDecWithPrec(-4, 2),
"2D3430303030303030303030303030303030",
"\"-0.040000000000000000\"",
"\"-0.040000000000000000\"\n",
},
{
sdk.NewDecWithPrec(1414213562373095049, 18),
"31343134323133353632333733303935303439",
"\"1.414213562373095049\"",
"\"1.414213562373095049\"\n",
},
{
sdk.NewDecWithPrec(-1414213562373095049, 18),
"2D31343134323133353632333733303935303439",
"\"-1.414213562373095049\"",
"\"-1.414213562373095049\"\n",
},
{
sdk.NewDecFromBigIntWithPrec(largestBigInt, 18),
"313333343939313839373435303536383830313439363838383536363335353937303037313632363639303332363437323930373938313231363930313030343838383838373332383631323930303334333736343335313330343333353335",
"\"133499189745056880149688856635597007162669032647290798121690100488888732861290.034376435130433535\"",
"\"133499189745056880149688856635597007162669032647290798121690100488888732861290.034376435130433535\"\n",
},
{
sdk.NewDecFromBigIntWithPrec(smallestBigInt, 18),
"2D313333343939313839373435303536383830313439363838383536363335353937303037313632363639303332363437323930373938313231363930313030343838383838373332383631323930303334333736343335313330343333353335",
"\"-133499189745056880149688856635597007162669032647290798121690100488888732861290.034376435130433535\"",
"\"-133499189745056880149688856635597007162669032647290798121690100488888732861290.034376435130433535\"\n",
},
}
for _, tc := range testCases {
bz, err := tc.input.Marshal()
s.Require().NoError(err)
s.Require().Equal(tc.rawBz, fmt.Sprintf("%X", bz))
var other sdk.Dec
s.Require().NoError((&other).Unmarshal(bz))
s.Require().True(tc.input.Equal(other))
bz, err = json.Marshal(tc.input)
s.Require().NoError(err)
s.Require().Equal(tc.jsonStr, string(bz))
s.Require().NoError(json.Unmarshal(bz, &other))
s.Require().True(tc.input.Equal(other))
bz, err = yaml.Marshal(tc.input)
s.Require().NoError(err)
s.Require().Equal(tc.yamlStr, string(bz))
}
}
// Showcase that different orders of operations causes different results.
func (s *decimalTestSuite) TestOperationOrders() {
n1 := sdk.NewDec(10)
n2 := sdk.NewDec(1000000010)
s.Require().Equal(n1.Mul(n2).Quo(n2), sdk.NewDec(10))
s.Require().NotEqual(n1.Mul(n2).Quo(n2), n1.Quo(n2).Mul(n2))
}
func BenchmarkMarshalTo(b *testing.B) {
b.ReportAllocs()
bis := []struct {
in sdk.Dec
want []byte
}{
{
sdk.NewDec(1e8), []byte{
0x31, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
},
},
{sdk.NewDec(0), []byte{0x30}},
}
data := make([]byte, 100)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for _, bi := range bis {
if n, err := bi.in.MarshalTo(data); err != nil {
b.Fatal(err)
} else {
if !bytes.Equal(data[:n], bi.want) {
b.Fatalf("Mismatch\nGot: % x\nWant: % x\n", data[:n], bi.want)
}
}
}
}
}