Test your antivirus is working or not

This is a big question that how can we check that our antivirus is working properly or not.
After some time trial version expired ,this file will help to test your antivirus .
This test file has been provided to EICAR for distribution as the "EICAR Standard Anti-Virus Test File".It is safe to pass around, because it is not a virus not a malware program.
anti-virus product that supports the EICAR test file should detect it in any file providing that the file starts with the following 68 characters, and is exactly 68 bytes long:

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

The first 68 characters is the known string. It may be optionally appended by any combination of whitespace characters with the total file length not exceeding 128 characters. The only whitespace characters allowed are the space character, tab, LF, CR, CTRL-Z. To keep things simple the file uses only upper case letters, digits and punctuation marks, and does not include spaces. The only thing to watch out for when typing in the test file is that the third character.

if your antivirus detects it then its working properly.