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// Copyright 2024 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 proto_test
import (
"math"
"testing"
"github.com/google/go-cmp/cmp"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/testing/protocmp"
testfuzzpb "google.golang.org/protobuf/internal/testprotos/editionsfuzztest"
)
// compareEquivalentProtos compares equivalent messages m0 and m1, where one is
// typically a Protobuf Editions message and the other isn't. It unmarshals the
// wireBytes into a message of type m0 and one of type m1 and compares the
// resulting messages for equality (ignoring type names). m0 and m1 must
// describe equivalent messages, meaning having the same field numbers and
// types.
func compareEquivalentProtos(t *testing.T, wireBytes []byte, m0, m1 proto.Message) {
t.Helper()
m0Instance := m0.ProtoReflect().Type().New().Interface()
errM0 := proto.Unmarshal(wireBytes, m0Instance)
m1Instance := m1.ProtoReflect().Type().New().Interface()
errM1 := proto.Unmarshal(wireBytes, m1Instance)
// Check that the error are the same (possible nil)
errorsMatch := (errM1 != nil) == (errM0 != nil)
if errM1 != nil && errM0 != nil {
errorsMatch = errM1.Error() == errM0.Error()
}
if !errorsMatch {
t.Fatalf("errors not equal:\n%T error: %v\n%T error:%v", m0, errM0, m1, errM1)
}
// Marshal the editions proto and unmarshal it into the equivalent proto2
// message to be able to compare the messages.
// This tests slightly more than necessary but should only lead to more
// coverage (unless the marshalling would undo errors of the unmarshalling
// which is very unlikely).
roundTrippedM0 := m0.ProtoReflect().Type().New().Interface()
err := roundTripMessage(roundTrippedM0, m1Instance)
if err != nil {
t.Fatalf("failed round tripping proto: %v", err)
}
// The cmp package does not deal with NaN on its own and will report
// NaN != NaN.
optNaN64 := cmp.Comparer(func(x, y float32) bool {
return (math.IsNaN(float64(x)) && math.IsNaN(float64(y))) || x == y
})
optNaN32 := cmp.Comparer(func(x, y float64) bool {
return (math.IsNaN(x) && math.IsNaN(y)) || x == y
})
if diff := cmp.Diff(m0Instance, roundTrippedM0, protocmp.Transform(), optNaN64, optNaN32); diff != "" {
t.Error(diff)
}
if sizeM0, sizeM1 := proto.Size(m0Instance), proto.Size(m1Instance); sizeM0 != sizeM1 {
t.Errorf("proto.Size() not equal:\n%T size = %v\n%T size = %v", m0, sizeM0, m1, sizeM1)
}
}
func FuzzProto2EditionConversion(f *testing.F) {
f.Add([]byte("Hello World!"))
f.Add([]byte("\x82\x01\x010"))
f.Fuzz(func(t *testing.T, in []byte) {
compareEquivalentProtos(t, in, (*testfuzzpb.TestAllTypesProto2)(nil), (*testfuzzpb.TestAllTypesProto2Editions)(nil))
})
}
func FuzzProto3EditionConversion(f *testing.F) {
f.Add([]byte("Hello World!"))
f.Add([]byte("\x82\x01\x010"))
f.Fuzz(func(t *testing.T, in []byte) {
compareEquivalentProtos(t, in, (*testfuzzpb.TestAllTypesProto3)(nil), (*testfuzzpb.TestAllTypesProto3Editions)(nil))
})
}