I think that the threshold for assurance is very low. The state would only have to say that it is going to take the case to trial.
In Hassan's case, his lawyer argued in front of the court of appeal that France was not ready for trial and that it was still investigating the case. The Minister of Justice said that France had charged him and was ready for trial. Hassan went there and it was for an investigation. The investigation took three years and two months, and then he was released because the two investigative judges found that the evidence supported his innocence rather than his guilt. That's why he returned to Canada.
Under the current system, the requesting state can say that it's ready for trial. That's all it takes and the Minister of Justice would believe that.