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import _ from 'underscore';
import SmartInterval from '~/smart_interval';
describe('SmartInterval', function () {
const DEFAULT_MAX_INTERVAL = 100;
const DEFAULT_STARTING_INTERVAL = 5;
const DEFAULT_SHORT_TIMEOUT = 75;
const DEFAULT_LONG_TIMEOUT = 1000;
const DEFAULT_INCREMENT_FACTOR = 2;
function createDefaultSmartInterval(config) {
const defaultParams = {
callback: () => Promise.resolve(),
startingInterval: DEFAULT_STARTING_INTERVAL,
maxInterval: DEFAULT_MAX_INTERVAL,
incrementByFactorOf: DEFAULT_INCREMENT_FACTOR,
lazyStart: false,
immediateExecution: false,
hiddenInterval: null,
};
if (config) {
_.extend(defaultParams, config);
}
return new SmartInterval(defaultParams);
}
describe('Increment Interval', function () {
beforeEach(function () {
this.smartInterval = createDefaultSmartInterval();
});
it('should increment the interval delay', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
const intervalConfig = this.smartInterval.cfg;
const iterationCount = 4;
const maxIntervalAfterIterations = intervalConfig.startingInterval *
(intervalConfig.incrementByFactorOf ** (iterationCount - 1)); // 40
const currentInterval = interval.getCurrentInterval();
// Provide some flexibility for performance of testing environment
expect(currentInterval).toBeGreaterThan(intervalConfig.startingInterval);
expect(currentInterval <= maxIntervalAfterIterations).toBeTruthy();
done();
}, DEFAULT_SHORT_TIMEOUT); // 4 iterations, increment by 2x = (5 + 10 + 20 + 40)
});
it('should not increment past maxInterval', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
const currentInterval = interval.getCurrentInterval();
expect(currentInterval).toBe(interval.cfg.maxInterval);
done();
}, DEFAULT_LONG_TIMEOUT);
});
it('does not increment while waiting for callback', function () {
jasmine.clock().install();
const smartInterval = createDefaultSmartInterval({
callback: () => new Promise($.noop),
});
jasmine.clock().tick(DEFAULT_SHORT_TIMEOUT);
const oneInterval = smartInterval.cfg.startingInterval * DEFAULT_INCREMENT_FACTOR;
expect(smartInterval.getCurrentInterval()).toEqual(oneInterval);
jasmine.clock().uninstall();
});
});
describe('Public methods', function () {
beforeEach(function () {
this.smartInterval = createDefaultSmartInterval();
});
it('should cancel an interval', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
interval.cancel();
const intervalId = interval.state.intervalId;
const currentInterval = interval.getCurrentInterval();
const intervalLowerLimit = interval.cfg.startingInterval;
expect(intervalId).toBeUndefined();
expect(currentInterval).toBe(intervalLowerLimit);
done();
}, DEFAULT_SHORT_TIMEOUT);
});
it('should resume an interval', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
interval.cancel();
interval.resume();
const intervalId = interval.state.intervalId;
expect(intervalId).toBeTruthy();
done();
}, DEFAULT_SHORT_TIMEOUT);
});
});
describe('DOM Events', function () {
beforeEach(function () {
// This ensures DOM and DOM events are initialized for these specs.
setFixtures('<div></div>');
this.smartInterval = createDefaultSmartInterval();
});
it('should pause when page is not visible', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
expect(interval.state.intervalId).toBeTruthy();
// simulates triggering of visibilitychange event
interval.handleVisibilityChange({ target: { visibilityState: 'hidden' } });
expect(interval.state.intervalId).toBeUndefined();
done();
}, DEFAULT_SHORT_TIMEOUT);
});
it('should change to the hidden interval when page is not visible', function (done) {
const HIDDEN_INTERVAL = 1500;
const interval = createDefaultSmartInterval({ hiddenInterval: HIDDEN_INTERVAL });
setTimeout(() => {
expect(interval.state.intervalId).toBeTruthy();
expect(interval.getCurrentInterval() >= DEFAULT_STARTING_INTERVAL &&
interval.getCurrentInterval() <= DEFAULT_MAX_INTERVAL).toBeTruthy();
// simulates triggering of visibilitychange event
interval.handleVisibilityChange({ target: { visibilityState: 'hidden' } });
expect(interval.state.intervalId).toBeTruthy();
expect(interval.getCurrentInterval()).toBe(HIDDEN_INTERVAL);
done();
}, DEFAULT_SHORT_TIMEOUT);
});
it('should resume when page is becomes visible at the previous interval', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
expect(interval.state.intervalId).toBeTruthy();
// simulates triggering of visibilitychange event
interval.handleVisibilityChange({ target: { visibilityState: 'hidden' } });
expect(interval.state.intervalId).toBeUndefined();
// simulates triggering of visibilitychange event
interval.handleVisibilityChange({ target: { visibilityState: 'visible' } });
expect(interval.state.intervalId).toBeTruthy();
done();
}, DEFAULT_SHORT_TIMEOUT);
});
it('should cancel on page unload', function (done) {
const interval = this.smartInterval;
setTimeout(() => {
$(document).triggerHandler('beforeunload');
expect(interval.state.intervalId).toBeUndefined();
expect(interval.getCurrentInterval()).toBe(interval.cfg.startingInterval);
done();
}, DEFAULT_SHORT_TIMEOUT);
});
it('should execute callback before first interval', function () {
const interval = createDefaultSmartInterval({ immediateExecution: true });
expect(interval.cfg.immediateExecution).toBeFalsy();
});
});
});
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