statsv.test.js
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statsv.test.js
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	import * as stubs from './../stubs';
	import { isEnabled } from '../../../src/instrumentation/statsv';

	QUnit.module( 'ext.popups/instrumentation/statsv' );

	QUnit.test( '#isEnabled', function ( assert ) {
	const user = stubs.createStubUser(),
	config = stubs.createStubMap(),
	weightedBooleanStub = this.sandbox.stub(),
	experiments = {
	weightedBoolean: weightedBooleanStub
	};

	config.set( 'wgPopupsStatsvSamplingRate', 0.3141 );

	isEnabled( user, config, experiments );

	assert.strictEqual(
	weightedBooleanStub.callCount,
	1,
	'The experiments object is called.'
	);
	assert.deepEqual(
	weightedBooleanStub.getCall( 0 ).args,
	[
	'ext.Popups.statsv',
	config.get( 'wgPopupsStatsvSamplingRate' ),
	user.sessionId()
	],
	'The experiments object is called with the correct arguments.'
	);

	// ---

	config.delete( 'wgPopupsStatsvSamplingRate' );

	const defaultResult = isEnabled( user, config, experiments );
	assert.strictEqual(
	defaultResult,
	false,
	'The bucketing is disabled by default.'
	);
	assert.strictEqual(
	weightedBooleanStub.callCount,
	1,
	'The experiments object is not called when bucketing rate is the default 0.'
	);
	} );