proto/message_set_test.go

// Go support for Protocol Buffers - Google's data interchange format
//
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// https://github.com/golang/protobuf
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//
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package proto

import (
	"bytes"
	"testing"
)

func TestUnmarshalMessageSetWithDuplicate(t *testing.T) {
	// Check that a repeated message set entry will be concatenated.
	in := &messageSet{
		Item: []*_MessageSet_Item{
			{TypeId: Int32(12345), Message: []byte("hoo")},
			{TypeId: Int32(12345), Message: []byte("hah")},
		},
	}
	b, err := Marshal(in)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	t.Logf("Marshaled bytes: %q", b)

	var extensions XXX_InternalExtensions
	if err := UnmarshalMessageSet(b, &extensions); err != nil {
		t.Fatalf("UnmarshalMessageSet: %v", err)
	}
	ext, ok := extensions.p.extensionMap[12345]
	if !ok {
		t.Fatalf("Didn't retrieve extension 12345; map is %v", extensions.p.extensionMap)
	}
	// Skip wire type/field number and length varints.
	got := skipVarint(skipVarint(ext.enc))
	if want := []byte("hoohah"); !bytes.Equal(got, want) {
		t.Errorf("Combined extension is %q, want %q", got, want)
	}
}