With Cypress, you can easily create tests for your modern web applications, debug them visually, and automatically run them in your continuous integration builds.

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Not Go.Js, but something similar, I did something like this:

      // @ts-ignore
            if (window.Cypress) {
                // @ts-ignore
                window.store = store;
            }

In test code, we can then use developer tools and cy.window() to select canvas objects:

Cypress.Commands.add('clickComputer', (comp, name, beac) => {
  return cy.window().then(window => {
    const computer = window.store.campaign.allItems.filter(beacon => beacon.__typename === 'Computer');

    computer[comp].select();

    hostName = window.store.campaign.selectedHost.hostName;
    console.log(hostName);
    expect(hostName).to.eql(name);

    const numBeacons = window.store.campaign.selectedHost.beaconIds.data_.size;
    console.log(numBeacons);
    expect(numBeacons).to.eq(beac);
  });
});


<@715580668045951047> probably has a better way, but this is what I did.