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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"
"fmt"
"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 float64
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.Errorf("from %q expected error %s; got %s", s, err, 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 ****float64
}
t2 := Type2{}
t2.A = new(***float64)
*t2.A = new(**float64)
**t2.A = new(*float64)
***t2.A = new(float64)
****t2.A = 27.4
t2pppp := new(***Type2)
if err := encAndDec(t2, t2pppp); err != nil {
t.Fatal(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")
}
}
func TestRecursiveMapType(t *testing.T) {
type recursiveMap map[string]recursiveMap
r1 := recursiveMap{"A": recursiveMap{"B": nil, "C": nil}, "D": nil}
r2 := make(recursiveMap)
if err := encAndDec(r1, &r2); err != nil {
t.Error(err)
}
}
func TestRecursiveSliceType(t *testing.T) {
type recursiveSlice []recursiveSlice
r1 := recursiveSlice{0: recursiveSlice{0: nil}, 1: nil}
r2 := make(recursiveSlice, 0)
if err := encAndDec(r1, &r2); err != nil {
t.Error(err)
}
}
// 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 []float64
}
t7 := Type7{
[]bool{false, false, true},
[]int{0, 0, 1},
[]string{"hi", "", "there"},
[]float64{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)
}
}
// Now follow various tests that decode into things that can't represent the
// encoded value, all of which should be legal.
// Also, when the ignored object contains an interface value, it may define
// types. Make sure that skipping the value still defines the types by using
// the encoder/decoder pair to send a value afterwards. If an interface
// is sent, its type in the test is always NewType0, so this checks that the
// encoder and decoder don't skew with respect to type definitions.
type Struct0 struct {
I interface{}
}
type NewType0 struct {
S string
}
type ignoreTest struct {
in, out interface{}
}
var ignoreTests = []ignoreTest{
// Decode normal struct into an empty struct
{&struct{ A int }{23}, &struct{}{}},
// Decode normal struct into a nil.
{&struct{ A int }{23}, nil},
// Decode singleton string into a nil.
{"hello, world", nil},
// Decode singleton slice into a nil.
{[]int{1, 2, 3, 4}, nil},
// Decode struct containing an interface into a nil.
{&Struct0{&NewType0{"value0"}}, nil},
// Decode singleton slice of interfaces into a nil.
{[]interface{}{"hi", &NewType0{"value1"}, 23}, nil},
}
func TestDecodeIntoNothing(t *testing.T) {
Register(new(NewType0))
for i, test := range ignoreTests {
b := new(bytes.Buffer)
enc := NewEncoder(b)
err := enc.Encode(test.in)
if err != nil {
t.Errorf("%d: encode error %s:", i, err)
continue
}
dec := NewDecoder(b)
err = dec.Decode(test.out)
if err != nil {
t.Errorf("%d: decode error: %s", i, err)
continue
}
// Now see if the encoder and decoder are in a consistent state.
str := fmt.Sprintf("Value %d", i)
err = enc.Encode(&NewType0{str})
if err != nil {
t.Fatalf("%d: NewType0 encode error: %s", i, err)
}
ns := new(NewType0)
err = dec.Decode(ns)
if err != nil {
t.Fatalf("%d: NewType0 decode error: %s", i, err)
}
if ns.S != str {
t.Fatalf("%d: expected %q got %q", i, str, ns.S)
}
}
}
// Another bug from golang-nuts, involving nested interfaces.
type Bug0Outer struct {
Bug0Field interface{}
}
type Bug0Inner struct {
A int
}
func TestNestedInterfaces(t *testing.T) {
var buf bytes.Buffer
e := NewEncoder(&buf)
d := NewDecoder(&buf)
Register(new(Bug0Outer))
Register(new(Bug0Inner))
f := &Bug0Outer{&Bug0Outer{&Bug0Inner{7}}}
var v interface{} = f
err := e.Encode(&v)
if err != nil {
t.Fatal("Encode:", err)
}
err = d.Decode(&v)
if err != nil {
t.Fatal("Decode:", err)
}
// Make sure it decoded correctly.
outer1, ok := v.(*Bug0Outer)
if !ok {
t.Fatalf("v not Bug0Outer: %T", v)
}
outer2, ok := outer1.Bug0Field.(*Bug0Outer)
if !ok {
t.Fatalf("v.Bug0Field not Bug0Outer: %T", outer1.Bug0Field)
}
inner, ok := outer2.Bug0Field.(*Bug0Inner)
if !ok {
t.Fatalf("v.Bug0Field.Bug0Field not Bug0Inner: %T", outer2.Bug0Field)
}
if inner.A != 7 {
t.Fatalf("final value %d; expected %d", inner.A, 7)
}
}