<commit_before>package com.google.sps;

import java.util.Collection;

import com.google.sps.data.*;

/**
 * Static class for permuting schedules given a list of courses.
 */
public final class Scheduler {
    public Collection<Schedule> generateSchedules(Collection<Course> courses){
        //TODO: This
        return null;
    }
}<commit_msg>add invariants to inputs for generateSchedules()<commit_after>package com.google.sps;

import java.util.Collection;

import com.google.sps.data.*;

/**
 * Static class for permuting schedules given a list of courses.
 */
public final class Scheduler {
    public Collection<Schedule> generateSchedules(Collection<Course> courses, int minCredits, int maxCredits){
        //TODO: This
        return null;
    }
}
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