import { expect } from 'chai';

class {
    onCreate() {
        this.testEvent1Fired = 0;
        this.testEvent2Fired = 0;

    }
    handleTestEvent1(arg1, arg2) {
        expect(arg1).to.equal('a');
        expect(arg2).to.equal('b');
        this.testEvent1Fired++;
    }

    handleTestEvent2(arg1, arg2) {
        expect(arg1).to.equal('c');
        expect(arg2).to.equal('d');
        this.testEvent2Fired++;
    }
}

<div>
    <app-bar key="bar" once-testEvent1('handleTestEvent1', 'a', 'b') once-testEvent2('handleTestEvent2', 'c', 'd')/>
</div>