Readiness Monitor - FAILED EMMISION

This is completely ridiculous and I am having trouble trying to understand this! I had check engine light. Coolant problem. I replaced a thermostat and sensor and all is fine with the vehicle. During my repair I disconnected the battery... it also cleared the check engine light. Later that same day, I took it in for a due emission testing and it bleeping failed!! Reason: INCOMPLETE READINESS MONITOR: EVAP, OXYGEN, OXYHEAT. How can I reset these? Is it a matter of driving it and it will clear itself? How the heck long does that take?