u can just simply test it before by calling the query like
$sql = "select * from user";
and compare it with BeforeDeleteUser.xml
And the Call Ur stored procedure
$sql = "CALL Delete_User_Details(:userId)";
And for the after case just repeat the before one again
$sql = "select * from user";
and compare it with AfterDeleteUser.xml
see the logic is very simple if u have 5 Users in BeforeDeleteUser.xml and it results true and after the call of CALL Delete_User_Details(:userId) stored procedure , the AfterDeleteUser.xml should contain only 4 user (or maybe idDelete field to 0 that depends on ur implementation)