( function ( mw ) {
	var HelpDialog = mw.libs.revisionSlider.HelpDialog;

	QUnit.module( 'ext.RevisionSlider.HelpDialog' );

	QUnit.test( 'Initialize HelpDialog', function ( assert ) {
		var helpDialog = new HelpDialog(),
			windowManager = new OO.ui.WindowManager();

		function getSlideTextHtml( slide ) {
			return slide.$element.find( '.mw-revslider-help-dialog-text' ).html();
		}

		$( 'body' ).append( windowManager.$element );
		windowManager.addWindows( [ helpDialog ] );

		assert.equal( helpDialog.slides.length, 4 );
		assert.equal( helpDialog.slidePointer, 0 );
		assert.equal( getSlideTextHtml( helpDialog.slides[ 0 ] ), mw.message( 'revisionslider-help-dialog-slide1' ).parse() );
		assert.equal( getSlideTextHtml( helpDialog.slides[ 1 ] ), mw.message( 'revisionslider-help-dialog-slide2' ).parse() );
		assert.equal( getSlideTextHtml( helpDialog.slides[ 2 ] ), mw.message( 'revisionslider-help-dialog-slide3' ).parse() );
		assert.equal( getSlideTextHtml( helpDialog.slides[ 3 ] ), mw.message( 'revisionslider-help-dialog-slide4' ).parse() );
	} );

} )( mediaWiki );