How to write basic tests?

#1

Hi,
I am trying to write some basic tests where I want to test my sync code. My sync logic subscribes to observeDeep to listen to the events. But my tests do not work, so I made the following sample:

test('should remove property from object', () => {
    const doc1 = new Y.Doc();
    const doc2 = new Y.Doc();

    const root1 = doc1.getMap();
    const root2 = doc2.getMap();

    doc1.transact(() => {
        root1.set('Key', '1');
    });

    doc2.transact(() => {
        root2.set('Key', '1');
    });

    doc1.on('update', (update: Uint8Array) => {
        console.log('Update');

        Y.logUpdate(update);
        Y.applyUpdate(doc2, update);
    });

    root2.observeDeep((events: any) => {
        console.log('EVENTS');
        console.log(JSON.stringify(events, undefined, 2));
    });


    doc1.transact(() => {
        root1.set('Key', '42');
    });
});

If I comment the initial two set calls out, I get an event, otherwise I do not receive an event. So I am confused what I am actually doing wrong.

But I receive updates:

image
image750×1023 34.1 KB

#2

I’m not totally clear what you’re asking. If you write a failing test with assertions, that would be easier to give feedback on.

Or, clearly describe the actual behavior and expected behavior.

#3

The sync was the problem, not the tests. But it turned out that I need a two way sync:

    const doc1 = new Y.Doc();
    const doc2 = new Y.Doc();

    doc1.on('update', (update: Uint8Array) => {
        Y.applyUpdate(doc2, update); 
    });

    doc2.on('update', (update: Uint8Array) => {
        Y.applyUpdate(doc1, update); 
    });

Then it works fine.Problem is solved.

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