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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);
enc.Encode(et1);
if enc.state.err != nil {
t.Error("encoder fail:", enc.state.err)
}
dec := NewDecoder(b);
newEt1 := new(ET1);
dec.Decode(newEt1);
if dec.state.err != nil {
t.Fatal("error decoding ET1:", dec.state.err)
}
if !reflect.DeepEqual(et1, newEt1) {
t.Fatalf("invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1)
}
if b.Len() != 0 {
t.Error("not at eof;", b.Len(), "bytes left")
}
enc.Encode(et1);
newEt1 = new(ET1);
dec.Decode(newEt1);
if dec.state.err != nil {
t.Fatal("round 2: error decoding ET1:", dec.state.err)
}
if !reflect.DeepEqual(et1, newEt1) {
t.Fatalf("round 2: invalid data for et1: expected %+v; got %+v\n", *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.
enc.Encode(et1);
if enc.state.err != nil {
t.Error("round 3: encoder fail:", enc.state.err)
}
newEt2 := new(ET2);
dec.Decode(newEt2);
if dec.state.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);
enc.Encode(et1);
if enc.state.err != nil {
t.Error("encoder fail:", enc.state.err)
}
dec := NewDecoder(b);
dec.Decode(e);
if shouldFail && (dec.state.err == nil) {
t.Error("expected error for", msg)
}
if !shouldFail && (dec.state.err != nil) {
t.Error("unexpected error for", msg, dec.state.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);
dec.Decode(new(ET2));
if dec.state.err != err {
t.Error("expected error", err, "got", dec.state.err)
}
}
// 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 (only structs work at the top level).
// Basic types work implicitly.
var unsupportedValues = []interface{}{
3,
"hi",
7.2,
[]int{1, 2, 3},
[3]int{1, 2, 3},
make(chan int),
func(a int) bool { return true },
make(map[string]int),
new(interface{}),
}
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);
enc.Encode(in);
if enc.state.err != nil {
return enc.state.err
}
dec := NewDecoder(b);
dec.Decode(out);
if dec.state.err != nil {
return dec.state.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;
}
type Type6 struct {
a [2]string; // can't hold t5.a
}
t5 := Type5{[3]string{"hello", ",", "world"}};
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")
}
}
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