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pixi.js / test / lib / pixi / utils / EventTarget.js

function pixi_utils_EventTarget_like(obj) {
    var expect = chai.expect;

    //public API
    expect(obj).to.respondTo('listeners');
    expect(obj).to.respondTo('emit');
    expect(obj).to.respondTo('on');
    expect(obj).to.respondTo('once');
    expect(obj).to.respondTo('off');
    expect(obj).to.respondTo('removeAllListeners');

    //Aliased names
    expect(obj).to.respondTo('removeEventListener');
    expect(obj).to.respondTo('addEventListener');
    expect(obj).to.respondTo('dispatchEvent');
}