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// Copyright 2009 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 gob
import (
"bytes"
"io"
"os"
"reflect"
"strings"
"testing"
)
type ET2 struct {
x string
}
type ET1 struct {
a int
et2 *ET2
next *ET1
}
// Like ET1 but with a different name for a field
type ET3 struct {
a int
et2 *ET2
differentNext *ET1
}
// Like ET1 but with a different type for a field
type ET4 struct {
a int
et2 float
next int
}
func TestEncoderDecoder(t *testing.T) {
b := new(bytes.Buffer)
enc := NewEncoder(b)
et1 := new(ET1)
et1.a = 7
et1.et2 = new(ET2)
err := enc.Encode(et1)
if err != nil {
t.Error("encoder fail:", err)
}
dec := NewDecoder(b)
newEt1 := new(ET1)
err = dec.Decode(newEt1)
if err != nil {
t.Fatal("error decoding ET1:", err)
}
if !reflect.DeepEqual(et1, newEt1) {
t.Fatalf("invalid data for et1: expected %+v; got %+v", *et1, *newEt1)
}
if b.Len() != 0 {
t.Error("not at eof;", b.Len(), "bytes left")
}
enc.Encode(et1)
newEt1 = new(ET1)
err = dec.Decode(newEt1)
if err != nil {
t.Fatal("round 2: error decoding ET1:", err)
}
if !reflect.DeepEqual(et1, newEt1) {
t.Fatalf("round 2: invalid data for et1: expected %+v; got %+v", *et1, *newEt1)
}
if b.Len() != 0 {
t.Error("round 2: not at eof;", b.Len(), "bytes left")
}
// Now test with a running encoder/decoder pair that we recognize a type mismatch.
err = enc.Encode(et1)
if err != nil {
t.Error("round 3: encoder fail:", err)
}
newEt2 := new(ET2)
err = dec.Decode(newEt2)
if err == nil {
t.Fatal("round 3: expected `bad type' error decoding ET2")
}
}
// Run one value through the encoder/decoder, but use the wrong type.
// Input is always an ET1; we compare it to whatever is under 'e'.
func badTypeCheck(e interface{}, shouldFail bool, msg string, t *testing.T) {
b := new(bytes.Buffer)
enc := NewEncoder(b)
et1 := new(ET1)
et1.a = 7
et1.et2 = new(ET2)
err := enc.Encode(et1)
if err != nil {
t.Error("encoder fail:", err)
}
dec := NewDecoder(b)
err = dec.Decode(e)
if shouldFail && err == nil {
t.Error("expected error for", msg)
}
if !shouldFail && err != nil {
t.Error("unexpected error for", msg, err)
}
}
// Test that we recognize a bad type the first time.
func TestWrongTypeDecoder(t *testing.T) {
badTypeCheck(new(ET2), true, "no fields in common", t)
badTypeCheck(new(ET3), false, "different name of field", t)
badTypeCheck(new(ET4), true, "different type of field", t)
}
func corruptDataCheck(s string, err os.Error, t *testing.T) {
b := bytes.NewBufferString(s)
dec := NewDecoder(b)
err1 := dec.Decode(new(ET2))
if err1 != err {
t.Error("expected error", err, "got", err1)
}
}
// Check that we survive bad data.
func TestBadData(t *testing.T) {
corruptDataCheck("", os.EOF, t)
corruptDataCheck("\x7Fhi", io.ErrUnexpectedEOF, t)
corruptDataCheck("\x03now is the time for all good men", errBadType, t)
}
// Types not supported by the Encoder.
var unsupportedValues = []interface{}{
make(chan int),
func(a int) bool { return true },
}
func TestUnsupported(t *testing.T) {
var b bytes.Buffer
enc := NewEncoder(&b)
for _, v := range unsupportedValues {
err := enc.Encode(v)
if err == nil {
t.Errorf("expected error for %T; got none", v)
}
}
}
func encAndDec(in, out interface{}) os.Error {
b := new(bytes.Buffer)
enc := NewEncoder(b)
err := enc.Encode(in)
if err != nil {
return err
}
dec := NewDecoder(b)
err = dec.Decode(out)
if err != nil {
return err
}
return nil
}
func TestTypeToPtrType(t *testing.T) {
// Encode a T, decode a *T
type Type0 struct {
a int
}
t0 := Type0{7}
t0p := (*Type0)(nil)
if err := encAndDec(t0, t0p); err != nil {
t.Error(err)
}
}
func TestPtrTypeToType(t *testing.T) {
// Encode a *T, decode a T
type Type1 struct {
a uint
}
t1p := &Type1{17}
var t1 Type1
if err := encAndDec(t1, t1p); err != nil {
t.Error(err)
}
}
func TestTypeToPtrPtrPtrPtrType(t *testing.T) {
type Type2 struct {
a ****float
}
t2 := Type2{}
t2.a = new(***float)
*t2.a = new(**float)
**t2.a = new(*float)
***t2.a = new(float)
****t2.a = 27.4
t2pppp := new(***Type2)
if err := encAndDec(t2, t2pppp); err != nil {
t.Error(err)
}
if ****(****t2pppp).a != ****t2.a {
t.Errorf("wrong value after decode: %g not %g", ****(****t2pppp).a, ****t2.a)
}
}
func TestSlice(t *testing.T) {
type Type3 struct {
a []string
}
t3p := &Type3{[]string{"hello", "world"}}
var t3 Type3
if err := encAndDec(t3, t3p); err != nil {
t.Error(err)
}
}
func TestValueError(t *testing.T) {
// Encode a *T, decode a T
type Type4 struct {
a int
}
t4p := &Type4{3}
var t4 Type4 // note: not a pointer.
if err := encAndDec(t4p, t4); err == nil || strings.Index(err.String(), "pointer") < 0 {
t.Error("expected error about pointer; got", err)
}
}
func TestArray(t *testing.T) {
type Type5 struct {
a [3]string
b [3]byte
}
type Type6 struct {
a [2]string // can't hold t5.a
}
t5 := Type5{[3]string{"hello", ",", "world"}, [3]byte{1, 2, 3}}
var t5p Type5
if err := encAndDec(t5, &t5p); err != nil {
t.Error(err)
}
var t6 Type6
if err := encAndDec(t5, &t6); err == nil {
t.Error("should fail with mismatched array sizes")
}
}
// Regression test for bug: must send zero values inside arrays
func TestDefaultsInArray(t *testing.T) {
type Type7 struct {
b []bool
i []int
s []string
f []float
}
t7 := Type7{
[]bool{false, false, true},
[]int{0, 0, 1},
[]string{"hi", "", "there"},
[]float{0, 0, 1},
}
var t7p Type7
if err := encAndDec(t7, &t7p); err != nil {
t.Error(err)
}
}
var testInt int
var testFloat32 float32
var testString string
var testSlice []string
var testMap map[string]int
var testArray [7]int
type SingleTest struct {
in interface{}
out interface{}
err string
}
var singleTests = []SingleTest{
{17, &testInt, ""},
{float32(17.5), &testFloat32, ""},
{"bike shed", &testString, ""},
{[]string{"bike", "shed", "paint", "color"}, &testSlice, ""},
{map[string]int{"seven": 7, "twelve": 12}, &testMap, ""},
{[7]int{4, 55, 0, 0, 0, 0, 0}, &testArray, ""}, // case that once triggered a bug
{[7]int{4, 55, 1, 44, 22, 66, 1234}, &testArray, ""},
// Decode errors
{172, &testFloat32, "wrong type"},
}
func TestSingletons(t *testing.T) {
b := new(bytes.Buffer)
enc := NewEncoder(b)
dec := NewDecoder(b)
for _, test := range singleTests {
b.Reset()
err := enc.Encode(test.in)
if err != nil {
t.Errorf("error encoding %v: %s", test.in, err)
continue
}
err = dec.Decode(test.out)
switch {
case err != nil && test.err == "":
t.Errorf("error decoding %v: %s", test.in, err)
continue
case err == nil && test.err != "":
t.Errorf("expected error decoding %v: %s", test.in, test.err)
continue
case err != nil && test.err != "":
if strings.Index(err.String(), test.err) < 0 {
t.Errorf("wrong error decoding %v: wanted %s, got %v", test.in, test.err, err)
}
continue
}
// Get rid of the pointer in the rhs
val := reflect.NewValue(test.out).(*reflect.PtrValue).Elem().Interface()
if !reflect.DeepEqual(test.in, val) {
t.Errorf("decoding singleton: expected %v got %v", test.in, val)
}
}
}
func TestStructNonStruct(t *testing.T) {
type Struct struct {
a string
}
type NonStruct string
s := Struct{"hello"}
var sp Struct
if err := encAndDec(s, &sp); err != nil {
t.Error(err)
}
var ns NonStruct
if err := encAndDec(s, &ns); err == nil {
t.Error("should get error for struct/non-struct")
} else if strings.Index(err.String(), "type") < 0 {
t.Error("for struct/non-struct expected type error; got", err)
}
// Now try the other way
var nsp NonStruct
if err := encAndDec(ns, &nsp); err != nil {
t.Error(err)
}
if err := encAndDec(ns, &s); err == nil {
t.Error("should get error for non-struct/struct")
} else if strings.Index(err.String(), "type") < 0 {
t.Error("for non-struct/struct expected type error; got", err)
}
}
type interfaceIndirectTestI interface {
F() bool
}
type interfaceIndirectTestT struct{}
func (this *interfaceIndirectTestT) F() bool {
return true
}
// A version of a bug reported on golang-nuts. Also tests top-level
// slice of interfaces. The issue was registering *T caused T to be
// stored as the concrete type.
func TestInterfaceIndirect(t *testing.T) {
Register(&interfaceIndirectTestT{})
b := new(bytes.Buffer)
w := []interfaceIndirectTestI{&interfaceIndirectTestT{}}
err := NewEncoder(b).Encode(w)
if err != nil {
t.Fatal("encode error:", err)
}
var r []interfaceIndirectTestI
err = NewDecoder(b).Decode(&r)
if err != nil {
t.Fatal("decode error:", err)
}
}