util: drop io, reuse its tests for binaryRW

pkg/util/binaryrw_test.go

@@ -0,0 +1,67 @@
+package util
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWriteVarUint1(t *testing.T) {
+	var (
+		val = uint64(1)
+		buf = new(bytes.Buffer)
+	)
+	bw := BinWriter{W: buf}
+	bw.WriteVarUint(val)
+	assert.Nil(t, bw.Err)
+	assert.Equal(t, 1, buf.Len())
+}
+
+func TestWriteVarUint1000(t *testing.T) {
+	var (
+		val = uint64(1000)
+		buf = new(bytes.Buffer)
+	)
+	bw := BinWriter{W: buf}
+	bw.WriteVarUint(val)
+	assert.Nil(t, bw.Err)
+	assert.Equal(t, 3, buf.Len())
+	assert.Equal(t, byte(0xfd), buf.Bytes()[0])
+	br := BinReader{R: buf}
+	res := br.ReadVarUint()
+	assert.Nil(t, br.Err)
+	assert.Equal(t, val, res)
+}
+
+func TestWriteVarUint100000(t *testing.T) {
+	var (
+		val = uint64(100000)
+		buf = new(bytes.Buffer)
+	)
+	bw := BinWriter{W: buf}
+	bw.WriteVarUint(val)
+	assert.Nil(t, bw.Err)
+	assert.Equal(t, 5, buf.Len())
+	assert.Equal(t, byte(0xfe), buf.Bytes()[0])
+	br := BinReader{R: buf}
+	res := br.ReadVarUint()
+	assert.Nil(t, br.Err)
+	assert.Equal(t, val, res)
+}
+
+func TestWriteVarUint100000000000(t *testing.T) {
+	var (
+		val = uint64(1000000000000)
+		buf = new(bytes.Buffer)
+	)
+	bw := BinWriter{W: buf}
+	bw.WriteVarUint(val)
+	assert.Nil(t, bw.Err)
+	assert.Equal(t, 9, buf.Len())
+	assert.Equal(t, byte(0xff), buf.Bytes()[0])
+	br := BinReader{R: buf}
+	res := br.ReadVarUint()
+	assert.Nil(t, br.Err)
+	assert.Equal(t, val, res)
+}