$mock->expects( $this->once() )->method( 'onUserSetCookies' )
->will( $this->returnCallback( function ( $u, &$sessionData, &$cookies ) use ( $user ) {
$this->assertSame( $user, $u );
$mock->expects( $this->once() )->method( 'onUserSetCookies' )
->will( $this->returnCallback( function ( $u, &$sessionData, &$cookies ) use ( $user ) {
$this->assertSame( $user, $u );