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