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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package big
import (
"bytes"
"encoding/gob"
"encoding/json"
"encoding/xml"
"testing"
)
func TestRatGobEncoding(t *testing.T) {
var medium bytes.Buffer
enc := gob.NewEncoder(&medium)
dec := gob.NewDecoder(&medium)
for _, test := range encodingTests {
medium.Reset() // empty buffer for each test case (in case of failures)
var tx Rat
tx.SetString(test + ".14159265")
if err := enc.Encode(&tx); err != nil {
t.Errorf("encoding of %s failed: %s", &tx, err)
continue
}
var rx Rat
if err := dec.Decode(&rx); err != nil {
t.Errorf("decoding of %s failed: %s", &tx, err)
continue
}
if rx.Cmp(&tx) != 0 {
t.Errorf("transmission of %s failed: got %s want %s", &tx, &rx, &tx)
}
}
}
// Sending a nil Rat pointer (inside a slice) on a round trip through gob should yield a zero.
// TODO: top-level nils.
func TestGobEncodingNilRatInSlice(t *testing.T) {
buf := new(bytes.Buffer)
enc := gob.NewEncoder(buf)
dec := gob.NewDecoder(buf)
var in = make([]*Rat, 1)
err := enc.Encode(&in)
if err != nil {
t.Errorf("gob encode failed: %q", err)
}
var out []*Rat
err = dec.Decode(&out)
if err != nil {
t.Fatalf("gob decode failed: %q", err)
}
if len(out) != 1 {
t.Fatalf("wrong len; want 1 got %d", len(out))
}
var zero Rat
if out[0].Cmp(&zero) != 0 {
t.Fatalf("transmission of (*Int)(nil) failed: got %s want 0", out)
}
}
var ratNums = []string{
"-141592653589793238462643383279502884197169399375105820974944592307816406286",
"-1415926535897932384626433832795028841971",
"-141592653589793",
"-1",
"0",
"1",
"141592653589793",
"1415926535897932384626433832795028841971",
"141592653589793238462643383279502884197169399375105820974944592307816406286",
}
var ratDenoms = []string{
"1",
"718281828459045",
"7182818284590452353602874713526624977572",
"718281828459045235360287471352662497757247093699959574966967627724076630353",
}
func TestRatJSONEncoding(t *testing.T) {
for _, num := range ratNums {
for _, denom := range ratDenoms {
var tx Rat
tx.SetString(num + "/" + denom)
b, err := json.Marshal(&tx)
if err != nil {
t.Errorf("marshaling of %s failed: %s", &tx, err)
continue
}
var rx Rat
if err := json.Unmarshal(b, &rx); err != nil {
t.Errorf("unmarshaling of %s failed: %s", &tx, err)
continue
}
if rx.Cmp(&tx) != 0 {
t.Errorf("JSON encoding of %s failed: got %s want %s", &tx, &rx, &tx)
}
}
}
}
func TestRatXMLEncoding(t *testing.T) {
for _, num := range ratNums {
for _, denom := range ratDenoms {
var tx Rat
tx.SetString(num + "/" + denom)
b, err := xml.Marshal(&tx)
if err != nil {
t.Errorf("marshaling of %s failed: %s", &tx, err)
continue
}
var rx Rat
if err := xml.Unmarshal(b, &rx); err != nil {
t.Errorf("unmarshaling of %s failed: %s", &tx, err)
continue
}
if rx.Cmp(&tx) != 0 {
t.Errorf("XML encoding of %s failed: got %s want %s", &tx, &rx, &tx)
}
}
}
}
func TestRatGobDecodeShortBuffer(t *testing.T) {
for _, tc := range [][]byte{
[]byte{0x2},
[]byte{0x2, 0x0, 0x0, 0x0, 0xff},
} {
err := NewRat(1, 2).GobDecode(tc)
if err == nil {
t.Error("expected GobDecode to return error for malformed input")
}
}
}
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