I have an appointment with a certified mold testing professional on Monday morning, and have properly informed the tenant that we will be there. 

The tenant was given the name and telephone number of the company and told he would be contacted to set up an appointment to see the pool.    

But, they'll make appointments for showings and snoop around and generally waste your time.

Vacuum and sweep the floors, outside steps and walkway.Weed the garden bed.Before attempting to clean stains from carpets and other surfaces, please call us so we can recommend suitable cleaning methods.Do not attempt to clean carpets with a shampoo machine as doing so may cause damage to the floor covering and the floor beneath.Utilities.You are responsible to pay for utilities through the last day of your rental period.Call the utility companies in advance and let them know the date of your last day of tenancy.Be sure to change mail delivery and subscription services to your new address.Inspection.Please let us know when you have vacated the unit and make an appointment with us for a final walk-through.You are not required to be present for the move-out inspection, but we highly encourage it.Before we begin the inspection, we will ask you about any known damages that occurred during your tenancy.Please note, it is often less expensive for us to repair damages than for tenants to repair damages, so talk to us first before attempting to repair any damage.The unit should be thoroughly clean both inside and outside and be ready for the next tenant.Final Report on Deposits.Within fourteen (14) days of our regaining possession of the unit, we will mail to you a complete written accounting of any money withheld from your security deposit and return the remainder.We will deduct for extra cleaning, damages, unpaid fees, unpaid utilities and unpaid rent, if such apply to your situation.Please provide us with your new address.Thank you.

I don't know why you made an appointment without checking my availability."

You just need to make an appointment.

Maybe call and see if you can make an appointment? 

I'm in California and in our agreement it I put that text was ok for normal written communication like maintenance appointment or request.

I've done open houses and private appointments.  

(it was a rescheduled appointment).