mediawiki.experiments.test.js
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mediawiki.experiments.test.js
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	( function () {

	const getBucket = mw.experiments.getBucket;

	function createExperiment() {
	return {
	name: 'experiment',
	enabled: true,
	buckets: {
	control: 0.25,
	A: 0.25,
	B: 0.25,
	C: 0.25
	}
	};
	}

	QUnit.module( 'mediawiki.experiments' );

	QUnit.test( 'getBucket( experiment, token )', ( assert ) => {
	const token = '123457890';
	let experiment = createExperiment();

	assert.strictEqual(
	getBucket( experiment, token ),
	getBucket( experiment, token ),
	'It returns the same bucket for the same experiment-token pair.'
	);

	// --------
	experiment = createExperiment();
	experiment.buckets = {
	A: 0.314159265359
	};

	assert.strictEqual(
	getBucket( experiment, token ),
	'A',
	'It returns the bucket if only one is defined.'
	);

	// --------
	experiment = createExperiment();
	experiment.enabled = false;

	assert.strictEqual(
	getBucket( experiment, token ),
	'control',
	'It returns "control" if the experiment is disabled.'
	);

	// --------
	experiment = createExperiment();
	experiment.buckets = {};

	assert.strictEqual(
	getBucket( experiment, token ),
	'control',
	'It returns "control" if the experiment doesn\'t have any buckets.'
	);
	} );

	}() );