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varint_test.go
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varint_test.go
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package bt_test
import (
"bytes"
"encoding/binary"
"testing"
"github.com/libsv/go-bt/v2"
"github.com/stretchr/testify/assert"
)
func convertIntToBytes(int uint64) []byte {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.LittleEndian, int); err != nil {
return nil
}
return buf.Bytes()
}
func TestDecodeVarInt(t *testing.T) {
t.Parallel()
var tests = []struct {
testName string
input []byte
expectedResult uint64
expectedSize int
}{
{"0xff", convertIntToBytes(0xff), 0, 9},
{"0xfe", convertIntToBytes(0xfe), 0, 5},
{"0xfd", convertIntToBytes(0xfd), 0, 3},
{"1", convertIntToBytes(1), 1, 1},
}
for _, test := range tests {
t.Run(test.testName, func(t *testing.T) {
r, s := bt.NewVarIntFromBytes(test.input)
assert.Equal(t, test.expectedResult, uint64(r))
assert.Equal(t, test.expectedSize, s)
})
}
}
func TestVarIntUpperLimitInc(t *testing.T) {
t.Parallel()
var tests = []struct {
testName string
input uint64
expectedResult int
}{
{"0", 0, 0},
{"10", 10, 0},
{"100", 100, 0},
{"252", 252, 2},
{"65535", 65535, 2},
{"4294967295", 4294967295, 4},
{"18446744073709551615", 18446744073709551615, -1},
}
for _, test := range tests {
t.Run(test.testName, func(t *testing.T) {
r := bt.VarInt(test.input).UpperLimitInc()
assert.Equal(t, test.expectedResult, r)
})
}
}
func TestVarInt(t *testing.T) {
t.Parallel()
var varIntTests = []struct {
testName string
input uint64
expectedLen int
}{
{"VarInt 1 byte Lower", 0, 1},
{"VarInt 1 byte Upper", 252, 1},
{"VarInt 3 byte Lower", 253, 3},
{"VarInt 3 byte Upper", 65535, 3},
{"VarInt 5 byte Lower", 65536, 5},
{"VarInt 5 byte Upper", 4294967295, 5},
{"VarInt 9 byte Lower", 4294967296, 9},
{"VarInt 9 byte Upper", 18446744073709551615, 9},
}
for _, varIntTest := range varIntTests {
t.Run(varIntTest.testName, func(t *testing.T) {
assert.Equal(t, varIntTest.expectedLen, len(bt.VarInt(varIntTest.input).Bytes()))
})
}
}
func TestVarInt_Size(t *testing.T) {
tests := map[string]struct {
v bt.VarInt
expSize int
}{
"252 returns 1": {
v: bt.VarInt(252),
expSize: 1,
},
"253 returns 3": {
v: bt.VarInt(253),
expSize: 3,
},
"65535 returns 3": {
v: bt.VarInt(65535),
expSize: 3,
},
"65536 returns 5": {
v: bt.VarInt(65536),
expSize: 5,
},
"4294967295 returns 5": {
v: bt.VarInt(4294967295),
expSize: 5,
},
"4294967296 returns 9": {
v: bt.VarInt(4294967296),
expSize: 9,
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
assert.Equal(t, test.expSize, test.v.Length())
})
}
}