/**
* Tests that the expression is correctly traversed
*
* @return void
*/
public function testTraverse()
{
$count = 0;
$visitor = function () use(&$count) {
$count++;
};
$expr = new QueryExpression();
$expr->eq('test', 'true');
$expr2 = new QueryExpression();
$expr2->eq('test', 'false');
$caseExpression = new CaseExpression([$expr, $expr2]);
$caseExpression->traverse($visitor);
$this->assertSame(4, $count);
}