Will the installer check the entire system once completed and how do I know that it is working?

Will the installer check the entire system once completed and how do I know that it is working?

Your installer should check the system.

You can check if the system is working through monitoring:
Some systems have a display on the battery storage system itself, with indicators such as operating mode and battery state of charge. 
Some systems support a remote display option that can be installed inside your house, known as an in-home display. These systems are often combined with other information about your home energy use – such as air-conditioning usage, solar generation and tariff information. 
Some systems can connect to the internet and allow you to view information from your computer, smartphone or tablet, even when you’re not at home. Check whether your system has inbuilt WiFi or if you need a new data point installed.