naive implementation of MongoDB storage
    it('should assign session ID when created')
added Visual Studio project
MongoDB
    it('should assign session ID when created')
async MongoDB, now hangs on disconnect :(
seems doesn't hang
fixed nasty little mistake
    it('should assign unique IDs when two sessions created')
    it('should return same session by id when created')
    it('should return error when session not found')
some more checks for err
added disconnect
    it("should return session with specified scrum master's name when created")
extracted excessive checks on error in dedicated test cases
    it('should not return error when session created')
    it('should not return error when session found')
    it('should not return error when user created')
    it('should assign user ID when created')
switched to OK/not OK testing
simplified callback call
better javascript style
    it('should assign unique IDs when two users created')
    it('should have specified user name when created')