Add test case for uppercase atoms.
Add test case for uppercase atoms.

Related to #1716.
hillu/yara,wxsBSD/yara,wxsBSD/yara,hillu/yara,VirusTotal/yara,VirusTotal/yara,VirusTotal/yara,hillu/yara,wxsBSD/yara,wxsBSD/yara,VirusTotal/yara,VirusTotal/yara,wxsBSD/yara,hillu/yara,hillu/yara