ThreadItem.test.js
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ThreadItem.test.js
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	const
	CommentItem = require( 'ext.discussionTools.init' ).CommentItem,
	HeadingItem = require( 'ext.discussionTools.init' ).HeadingItem;

	QUnit.module( 'mw.dt.ThreadItem', QUnit.newMwEnvironment() );

	QUnit.test( '#getAuthorsBelow/#getThreadItemsBelow', ( assert ) => {
	const cases = require( '../cases/authors.json' );

	function newFromJSON( json ) {
	let item;
	if ( json.type === 'heading' ) {
	item = new HeadingItem();
	} else {
	item = new CommentItem();
	item.author = json.author;
	item.displayName = json.displayName;
	}
	item.id = json.id;
	item.replies = json.replies.map( newFromJSON );
	return item;
	}

	cases.forEach( ( caseItem ) => {
	const threadItem = newFromJSON( caseItem.thread ),
	authors = threadItem.getAuthorsBelow();

	assert.deepEqual(
	authors,
	caseItem.expectedAuthorsBelow,
	'getAuthorsBelow'
	);

	assert.deepEqual(
	threadItem.getThreadItemsBelow().map( ( item ) => item.id ),
	caseItem.expectedThreadItemIdsBelow
	);
	} );
	} );

	// TODO:
	// * getHeading (CommentItem+HeadingItem)
	// * getLinkableTitle (HeadingItem)
	// * newFromJSON (ThreadItem)