apptest.ts

async function test() {
   db.delete();
   db.open();
   await Promise.all([db.users.clear(), db.groups.clear(), db.usersInGroups.clear()]);

   /**
   | userid | groupid |
   | :----: | :-----: |
   |   1    |    1    |
   |   1    |    2    |
   |   2    |    3    |
   |   3    |    3    |
    */
   const user1 = new User('user1');
   await putUser(user1);
   const user2 = new User('user2');
   await putUser(user2);
   const user3 = new User('user3');
   await putUser(user3);

   const group1 = new Group('group1')
   await putGroup(group1);
   const group2 = new Group('group2');
   await putGroup(group2);
   const group3 = new Group('group3');
   await putGroup(group3);

   /**
   | userid | groupid |
   | :----: | :-----: |
   |   1    |    1    |
   |   1    |    2    |
   |   2    |    3    |
   |   3    |    3    |
    */

   await putUserInGroup(user1, group1);
   await putUserInGroup(user1, group2);
   await putUserInGroup(user2, group3);
   await putUserInGroup(user3, group3);

  let groupsForUser1 = await getUserGroups(user1);
  let groupsForUser2 = await getUserGroups(user2);
  let groupsForUser3 = await getUserGroups(user3);

  let usersForGroup1 = await getGroupUsers(user1);
  let usersForGroup2 = await getGroupUsers(user2);
  let usersForGroup3 = await getGroupUsers(user3);

   /**
   | userid | groupid |
   | :----: | :-----: |
   |   1    |    1    |
   |   1    |    2    |
   |   2    |    3    |
   |   3    |    3    |
    */

  console.log("groupsForUser1-[1,2]", JSON.stringify(groupsForUser1)); // Should log group1, group2
  console.log("groupsForUser2-[3]", JSON.stringify(groupsForUser2)); // Should log group3
  console.log("groupsForUser3-[3]", JSON.stringify(groupsForUser3)); // Should log group3

  console.log("usersForGroup1-[1]", JSON.stringify(usersForGroup1)); // Should log group1
  console.log("usersForGroup2-[1]", JSON.stringify(usersForGroup2)); // Should log group1
  console.log("usersForGroup3-[3]", JSON.stringify(usersForGroup3)); // Should log group1  
}
//Put a note in the tutorial about this
/**
putUserInGroup(user1, group1);
putUserInGroup(user2, group1);
 */

//putUserInGroupC(user1, group1);
//putUserInGroupC(user2, group1);
test();