render.test.js
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render.test.js
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	import render from '../../../src/changeListeners/render';
	import * as RendererModule from '../../../src/ui/renderer';

	QUnit.module( 'ext.popups/changeListeners/render', {
	beforeEach() {
	this.preview = {
	show: this.sandbox.stub().returns( $.Deferred().resolve() )
	};

	this.sandbox.stub( RendererModule, 'render' ).callsFake(
	this.sandbox.stub().returns( this.preview )
	);
	}
	} );

	QUnit.test(
	'it should show the preview with the behavior',
	function ( assert ) {
	const previewBehavior = {};

	const newState = {
	preview: {
	shouldShow: true,
	measures: {},
	activeToken: '1234567890'
	}
	};

	const changeListener = render( previewBehavior );
	changeListener( undefined, newState );

	assert.true(
	this.preview.show.calledWith(
	newState.preview.measures,
	previewBehavior,
	newState.preview.activeToken
	),
	'The preview is shown with correct arguments.'
	);
	}
	);

	QUnit.test( 'it should render the preview', ( assert ) => {
	const newState = {
	preview: {
	shouldShow: true,
	fetchResponse: {}
	}
	};

	const changeListener = render( /* previewBehavior = undefined */ );
	changeListener( undefined, newState );

	assert.true(
	RendererModule.render.calledWith( newState.preview.fetchResponse ),
	'It should use the data from the gateway.'
	);
	} );