DeferredUpdatesTest.php

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<?php

class DeferredUpdatesTest extends MediaWikiTestCase {

    public function testDoUpdates() {
        $updates = array(
            '1' => 'deferred update 1',
            '2' => 'deferred update 2',
            '3' => 'deferred update 3',
            '2-1' => 'deferred update 1 within deferred update 2',
        );
        DeferredUpdates::addCallableUpdate(
            function () use ( $updates ) {
                echo $updates['1'];
            }
        );
        DeferredUpdates::addCallableUpdate(
            function () use ( $updates ) {
                echo $updates['2'];
                DeferredUpdates::addCallableUpdate(
                    function () use ( $updates ) {
                        echo $updates['2-1'];
                    }
                );
            }
        );
        DeferredUpdates::addCallableUpdate(
            function () use ( $updates ) {
                echo $updates[3];
            }
        );

        $this->expectOutputString( implode( '', $updates ) );

        DeferredUpdates::doUpdates();
    }

}