| // 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 *ET1; |
| next int; |
| } |
| |
| func TestBasicEncoder(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) |
| } |
| |
| // Decode the result by hand to verify; |
| state := newDecodeState(b); |
| // The output should be: |
| // 0) The length, 38. |
| length := decodeUint(state); |
| if length != 38 { |
| t.Fatal("0. expected length 38; got", length); |
| } |
| // 1) -7: the type id of ET1 |
| id1 := decodeInt(state); |
| if id1 >= 0 { |
| t.Fatal("expected ET1 negative id; got", id1); |
| } |
| // 2) The wireType for ET1 |
| wire1 := new(wireType); |
| err := decode(b, tWireType, wire1); |
| if err != nil { |
| t.Fatal("error decoding ET1 type:", err); |
| } |
| info := getTypeInfoNoError(reflect.Typeof(ET1{})); |
| trueWire1 := &wireType{s: info.id.gobType().(*structType)}; |
| if !reflect.DeepEqual(wire1, trueWire1) { |
| t.Fatalf("invalid wireType for ET1: expected %+v; got %+v\n", *trueWire1, *wire1); |
| } |
| // 3) The length, 21. |
| length = decodeUint(state); |
| if length != 21 { |
| t.Fatal("3. expected length 21; got", length); |
| } |
| // 4) -8: the type id of ET2 |
| id2 := decodeInt(state); |
| if id2 >= 0 { |
| t.Fatal("expected ET2 negative id; got", id2); |
| } |
| // 5) The wireType for ET2 |
| wire2 := new(wireType); |
| err = decode(b, tWireType, wire2); |
| if err != nil { |
| t.Fatal("error decoding ET2 type:", err); |
| } |
| info = getTypeInfoNoError(reflect.Typeof(ET2{})); |
| trueWire2 := &wireType{s: info.id.gobType().(*structType)}; |
| if !reflect.DeepEqual(wire2, trueWire2) { |
| t.Fatalf("invalid wireType for ET2: expected %+v; got %+v\n", *trueWire2, *wire2); |
| } |
| // 6) The length, 6. |
| length = decodeUint(state); |
| if length != 6 { |
| t.Fatal("6. expected length 6; got", length); |
| } |
| // 7) The type id for the et1 value |
| newId1 := decodeInt(state); |
| if newId1 != -id1 { |
| t.Fatal("expected Et1 id", -id1, "got", newId1); |
| } |
| // 8) The value of et1 |
| newEt1 := new(ET1); |
| et1Id := getTypeInfoNoError(reflect.Typeof(*newEt1)).id; |
| err = decode(b, et1Id, newEt1); |
| if err != nil { |
| t.Fatal("error decoding ET1 value:", err); |
| } |
| if !reflect.DeepEqual(et1, newEt1) { |
| t.Fatalf("invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1); |
| } |
| // 9) EOF |
| if b.Len() != 0 { |
| t.Error("not at eof;", b.Len(), "bytes left") |
| } |
| |
| // Now do it again. This time we should see only the type id and value. |
| b.Reset(); |
| enc.Encode(et1); |
| if enc.state.err != nil { |
| t.Error("2nd round: encoder fail:", enc.state.err) |
| } |
| // The length. |
| length = decodeUint(state); |
| if length != 6 { |
| t.Fatal("6. expected length 6; got", length); |
| } |
| // 5a) The type id for the et1 value |
| newId1 = decodeInt(state); |
| if newId1 != -id1 { |
| t.Fatal("2nd round: expected Et1 id", -id1, "got", newId1); |
| } |
| // 6a) The value of et1 |
| newEt1 = new(ET1); |
| err = decode(b, et1Id, newEt1); |
| if err != nil { |
| t.Fatal("2nd round: error decoding ET1 value:", err); |
| } |
| if !reflect.DeepEqual(et1, newEt1) { |
| t.Fatalf("2nd round: invalid data for et1: expected %+v; got %+v\n", *et1, *newEt1); |
| } |
| // 7a) EOF |
| if b.Len() != 0 { |
| t.Error("2nd round: not at eof;", b.Len(), "bytes left") |
| } |
| } |
| |
| 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); |
| } |
| } |
| |
| // 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 := strings.NewBuffer(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{} { |
| []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) |
| } |
| } |
| } |