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A TDD framework to make coding drven by specifications easier

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//
// stubbing document to support fullscreen
//
document.originalGetElementById = document.getElementById;

document.fullscreenEnabled = true;

Object.defineProperty(document, 'fullscreenElement', {
  value: null,
  writable: true,
  configurable: true
});

document.exitFullscreen = function() {
    document.fullscreenElement = null;
};

document.getElementById = function(id) {
    const e = document.originalGetElementById(id);
    if (e) {
        e.requestFullscreen = function() {
            document.fullscreenElement = this;
        };
    }

    return e;
};