protobuf.js/tests/oneof.js

var tape = require("tape");

var protobuf = require("..");

tape.test("oneofs", function(test) {

    protobuf.load("tests/data/oneof.proto", function(err, root) {
        if (err)
            return test.fail(err.message);

        var Message = root.lookup("Message");

        var message = Message.create({
            str: "a",
            num: 1
        });

        test.equal(message.num, 1, "should initialize the last value");
        test.equal(message.getKind(), "num", "should reference the last value");
        
        message.setKind('num');
        test.notOk(message.hasOwnProperty('str'), "should delete other values");

        message.str = "a";
        message.setKind('str'); // message.kind = 'str' if IE8 support isn't required

        test.notOk(message.hasOwnProperty('num'), "should delete the previous value");
        test.equal(message.str, "a", "should set the new value");
        test.equal(message.kind, "str", "should reference the new value");

        message.num = 0; // default
        message.setKind('num');
        test.notOk(message.hasOwnProperty('str'), "should delete the previous value");
        test.equal(message.num, 0, "should set the new value");
        test.equal(message.kind, "num", "should reference the new value");
        test.equal(message.hasOwnProperty("num"), true, "should have the new value on the instance, not just the prototype");

        var buf = Message.encode(message).finish();
        test.equal(buf.length, 2, "should write a total of 2 bytes");
        test.equal(buf[0], 16, "should write id 1, wireType 0");
        test.equal(buf[1], 0, "should write a value of 0");

        test.end();
    });

});