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package binary
import (
"bytes"
"fmt"
"testing"
)
func TestVarint(t *testing.T) {
check := func(i int, s string) {
buf := new(bytes.Buffer)
n, err := new(int64), new(error)
WriteVarint(i, buf, n, err)
bufBytes := buf.Bytes() // Read before consuming below.
i_ := ReadVarint(buf, n, err)
if i != i_ {
fmt.Println(bufBytes)
t.Fatalf("Encoded %v and got %v", i, i_)
}
if s != "" {
if bufHex := fmt.Sprintf("%X", bufBytes); bufHex != s {
t.Fatalf("Encoded %v, expected %v", bufHex, s)
}
}
}
// 123457 is some prime.
for i := -(2 << 33); i < (2 << 33); i += 123457 {
check(i, "")
}
// Near zero
check(-1, "F101")
check(0, "0100")
check(1, "0101")
// Positives
check(1<<32-1, "04FFFFFFFF")
check(1<<32+0, "050100000000")
check(1<<32+1, "050100000001")
check(1<<53-1, "071FFFFFFFFFFFFF")
// Negatives
check(-1<<32+1, "F4FFFFFFFF")
check(-1<<32-0, "F50100000000")
check(-1<<32-1, "F50100000001")
check(-1<<53+1, "F71FFFFFFFFFFFFF")
}
func TestUvarint(t *testing.T) {
check := func(i uint, s string) {
buf := new(bytes.Buffer)
n, err := new(int64), new(error)
WriteUvarint(i, buf, n, err)
bufBytes := buf.Bytes()
i_ := ReadUvarint(buf, n, err)
if i != i_ {
fmt.Println(buf.Bytes())
t.Fatalf("Encoded %v and got %v", i, i_)
}
if s != "" {
if bufHex := fmt.Sprintf("%X", bufBytes); bufHex != s {
t.Fatalf("Encoded %v, expected %v", bufHex, s)
}
}
}
// 123457 is some prime.
for i := 0; i < (2 << 33); i += 123457 {
check(uint(i), "")
}
check(1, "0101")
check(1<<32-1, "04FFFFFFFF")
check(1<<32+0, "050100000000")
check(1<<32+1, "050100000001")
check(1<<53-1, "071FFFFFFFFFFFFF")
}