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// @flow strict-local
import assert from 'assert';
import sinon from 'sinon';
import throttle from '../src/throttle';
describe('throttle', () => {
it("doesn't invoke a function more than once in a given interval", () => {
let spy = sinon.spy();
let throttled = throttle(spy, 100);
throttled(1);
throttled(2);
throttled(3);
assert(spy.calledOnceWithExactly(1));
});
it('calls the underlying function again once the interval has passed', () => {
let time = sinon.useFakeTimers();
let spy = sinon.spy();
let throttled = throttle(spy, 100);
throttled(1);
throttled(2);
throttled(3);
time.tick(100);
throttled(4);
assert.deepEqual(spy.args, [[1], [4]]);
time.restore();
});
it('preserves the `this` when throttled functions are invoked', () => {
let result;
let throttled = throttle(function () {
result = this.bar;
}, 100);
throttled.call({bar: 'baz'});
assert(result === 'baz');
});
});